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Heap corruption on delete[]
Your code corrupts memory when it writes into an out-of-bounds index of array temp. And when the heap is corrupted, anything can happen (like a crash on delete[] call). Your temp array contains (size-1)*(size-1) items, while it is treated it as a size*(size-1) array inside the double loop: temp[(i-1)*size + j-1] = ... (because you multiply "the first index" by size). I guess replacing it with temp[(i-1)*temp_size + j-1] will solve the problem.

Categories : C++

Heap corruption during free()
you dont use pointer address you got from calloc in free, therefore memory start address pointed by free() argument differs. If i am not wrong you can't get whole bunch of memory then free them in parts , if this is what are you trying to achieve. At least with malloc. In free() use same value what you got from calloc().

Categories : C

Corruption of heap when using delete []p;
delete [] is only to be used after an allocation with new [], and delete only after new. This is how C++ works. If you want to simply allocate an array of 3 Rectangle's, use this: Rectangle *p = new Rectangle[3]; ... delete [] p;

Categories : C++

Heap corruption after FreeLibrary?
// HeapCorruption occurs now, but ONLY for "MyLibrary.dll" The comment is wrong. It should say // HeapCorruption is detected now. Which is a very common scenario, when code terminates then it is likely to have some memory to release that has been in use for a while. Giving ample opportunity to get that memory corrupted by pointer bugs and buffer overflows in your code. Or get a diagnostic from the debug heap when the EXE and the DLL use different CRT versions. That kind of heap damage goes undetected, until the heap manager needs to visit that memory to release it. Kaboom then. Use the debug allocator available from <crtdbg.h> to catch that kind of corruption earlier. Many debugging tools available in general to troubleshoot heap corruption bugs.

Categories : C++

Heap Corruption Detected in C++
matrix = new int*[cols]; for(int i = 0; i <= cols; i++) { matrix[i] = new int[rows]; } For an array with cols elements, the index is from 0 to cols - 1 inclusively. The heap corruption will be detected when delete [] matrix; Since matrix[cols] write a position out of array bound. UPDATE As @DanielKO (thank you buddy :p) pointed out in the comment there is a mismatch, the "Populate the matrix..." loop makes "i" iterate over "rows" when it should be iterating over "cols".

Categories : C++

Heap corruption in code
When writing the NUL terminator as you do: raw_data[size] = ''; ... you are using one byte more than the bytes you allocated. There may be other errors but there is definitely an error on this line -- writing to memory you have not allocated is "undefined behaviour" and could explain the crash you're observing.

Categories : C++

C++ Heap Corruption in Template array
The change you mention leads to undefined behavior. If you got something with new[] you must pass it to delete[]. Plain delete is only good for what you got with plain new. Your operator + and * creates new objects and return pointer to it. I don't see any attempt to delete those objects, so no wonder you have leaks. (It counts as bad design to return pointers-with-obligation for no good reason, even more so from operators on objects that should produce objects.)

Categories : C++

Corruption of the heap during memory allocation
The line head=(SyDetails) malloc(sizeof (SyDetails)); is wrong in two ways. First, the reason why you are corrupting the memory: SyDetails is a pointer, so this will allocate only sizeof(pointer) bytes which is less than the necessary sizeof(struct SystemDetails) - for which you should change it. Even better, change it to sizeof(*head) to be safe in case the type of head ever changes. The second thing is that in C, you should not cast the return value of malloc(). All in all: head = malloc(sizeof(*head)); is what you really want.

Categories : C

Can't resolve heap corruption at runtime
The line g_graph.adj = malloc(sizeof(Vertex *)) only allocates space for one Vertex pointer. As soon as you do vlist++, you move into unallocated space, and any use of that space is undefined. You'll need to change that first malloc call to malloc(sizeof(Vertex *) * vertex_count) to properly allocate the space.

Categories : C

Heap corruption while freeing memory C
C arrays are zero based so the line ch_number[strlen(error) - 2] =''; writes one byte beyond the end of ch_number. The effects of doing this are undefined but it sounds like you've written to a guard word used by the heap manager to detect exactly this sort of corruption. If you want to add a null terminator to ch_number, you need to allocate an extra byte of memory ch_number = malloc(strlen(error) - 1);

Categories : C

Heap corruption when freeing 2D dynamic array
A couple things: You need to malloc(size + 1) to fit the null-terminator. There is no need to do sizeof(char)- sizeof is defined in terms of char, so that will always be 1. You shouldn't cast the result of malloc - it is unnecessary and may hide problems. As msgsArray is not initialized, there is no guarantee strlen(msgsArray[line]) == 0. In fact, it probably won't. Use calloc instead of malloc if you want this to be true. In general, use strncpy instead of strcpy - it's safer. Rather than using strlen, it would be a better idea to initialize the char*s to null and check for null. What if the first msgToInsert is an empty string, but the rest are real strings? Your code will exit the loop because strlen(msgs[0]) == 0, which checking for null instead would fix.

Categories : C

char to wchar_t results in heap corruption
Stop overwriting random memory. This: wchar_t utf16_str; Only reserves space for one wide character, and then you write the entire converted string on top of that. You should do the malloc() first, but you need to use strlen() to figure out how many characters are going to be needed. Then convert into the allocated buffer, and return that. There are more issues, for instance sizeof message doesn't work like you probably expect it to. Also, please don't cast the return value of malloc() in C.

Categories : C

Running into a heap corruption with WinSock2 application
You are allocating only 1 byte for the recv() buffer, but you are trying to read sizeof(ServerPacket_SyncGame) number of bytes into it. You need to change this: char* SP_SG_RCVBUFF = new char; //new buffer for recv To this: char* SP_SG_RCVBUFF = new char[sizeof(ServerPacket_SyncGame)]; Same thing with your for loop: for(;;) { //char* buffer = new char; char* buffer = new char[sizeof(ServerPacket_SyncGame)]; //char* temp = new char; char* temp = new char[sizeof(ServerPacket_SyncGame)]; ... }; I would suggest you clean up your code: ServerPacket_SyncGame* SP_SG = new ServerPacket_SyncGame; //creates packet pointer for(int i = 0; i < 8; i++) //assigns the eight playerdata structs in the packet array { SP_SG->data[i].playerID = i; SP_SG->data[i]

Categories : Misc

heap corruption error when calling SysFreeString()
The marshaling layer will allocate a copy of the string in managed memory. That copy will be freed by the garbage collector. You do not have to SysFreeString a String in C#, and in fact, attempting to do so is a great way to corrupt the heap, as you have discovered. should I take it that there will be 2 copies performed on the string? The *str = bstrStr.copy(); and then by the marshalling layer? Let me describe in more detail what is happening here. Your Main method invokes the unmanaged code, passing the managed address of a local variable of type String. The marshaling layer creates its own storage of suitable size to hold a BSTR and passes a reference to that storage to your unmanaged code. The unmanaged code allocates a string object that refers to the storage associated with t

Categories : C#

Heap Corruption Detected with find and replace program
If I had to guess, I'd say it's being caused by you replacing a small string with a larger one that you don't have room for -- specifically corrupting the heap at this line in optimize(): strcpy(input_str, input_string.c_str());

Categories : C++

Delphi DLL return string from C# ... .NET 4.5 Heap Corruption but .NET 4.0 works? Explain please?
My few points: First, Marshal.FreeCoTaskMem is for freeing COM allocated memory blocks! It's not guaranteed to work for other memory blocks allocated by Delphi. NewStr is deprecated (I get this after googling): NewStr(const S: string): PString; deprecated; My suggestion is that you also export a DLL function that does string deallocation instead of using FreeCoTaskMem.

Categories : C#

getting heap corruption detected when freeing memory with calloc and changed stdout
You forgot the terminating '' when you calculate the needed length of file_full_name: You only have strlen(file_number)+10+4 with 10 == strlen(file_name) and 4 == strlen(file_ext). Add 1 for `'.

Categories : C++

Delete [] pBuff throws 'c0000374 (heap corruption)' Exception and program crashes
Are you really catching all exceptions and silently dropping them? There could be a failed new here (std::bad_alloc) Are there any checks on nEnd & nStart, making sure the size of the buffer you 'new' is > 0 ? So, you might want to check pBuffer for NULL before deleting it.

Categories : Visual C++

How to print method name in the log file using log4cplus
If you can't modify the LogMessage function you could use this method: int main() { LogMessage(DEBUG_LEVEL, __FILE__, __LINE__, "This is "__FUNCTION__" function"); // notice the missing commas ------------------------^------------^ } Since there is no comma the compiler will concatenate the output of __FUNCTION__ and your message. EDIT: #define PrintLogMessage(dwLogLevel, lpszLogMessage) LogMessage(dwLogLevel, _FILE, __LINE__, __FUNCTION__ lpszLogMessage) or #define PrintLogMessage(dwLogLevel, lpszLogMessage) LogMessage(dwLogLevel, _FILE, __LINE__, lpszLogMessage __FUNCTION__) or #define PrintLogMessage(dwLogLevel, lpszLogMessage) LogMessage(dwLogLevel, _FILE, __LINE__, lpszLogMessage __FUNCTION__ "function") or #define PrintLogMessage(dwLogLevel, lpszLogMessage)

Categories : C++

pthread - How to provide heap synchronization mechanisms when multiple threads share the same heap?
There are two possibilities - either the functions your system provides to deal with the heap (malloc, free, etc.) are thread-safe or they're not. If they are, no problem - you don't have to do anything. If they're not, you'll need to write a wrapper function for each one that you want to use and lock appropriately. pthread_mutex_* calls seem appropriate to me.

Categories : C

Using heap shot analysis shows memory addresses, but not lines of code. How do I determine what is causing the heap to grow?
Start with bbum's tutorial: When is a Leak not a Leak? The short answer is that there is no tool that is going to tell you the exact line of code that causes a leak. The system does not know where you made your mistake. It knows when you allocated memory, and it knows that memory hasn't been released, but it has no way to know whether you meant to release the memory or not. It especially does not know when you should have released the memory because it has no way to know why you allocated it in the first place. Using heap shots, you can discover what the extra objects are, and from there you can audit how you use those objects.

Categories : IOS

java: when a new object is allocated in heap, what is created in heap?
Storage space for the non-static instance variables (also for super-classes) and some bookkeeping information (for example the class of the object) will be allocated in the heap. The methods (code) are provided in the .class file, they are not represented in the heap.

Categories : Java

Deleting Strings on the Heap Created from Char[] one the Heap in C++
std::string may be initialized from a C style null-terminated string (const char *). There is no way for std::string to know if you need that const char * free()d, delete[]()d or neither, and as already stated it won't. Use smart-pointers to automatically delete dynamically allocated objects. There are a few different of these, each specialized for particular purposes. Have a look at scoped_ptr, auto_ptr and shared_ptr. Your project will probably have constraints on which smart pointers you get to use. In the context of C++ there is never a reason to hold strings in manually declared char arrays, std::string is much safer to use.

Categories : C++

Heap Data-Structure Re-Heap Method
You won't get binary tree if you use such indexing: int leftChild = 2 * index + 1; int rightChild = index + 1; I think you meant to write this: int leftChild = 2 * index + 1; int rightChild = 2 * index + 2; So the tree will look like this 0 / 1 2 / / 3 4 5 6 / 7 8 ... and so on As for duplicate elements as far as I know heap can contain duplicates and does not support duplicate removal. For example this is a valid heap of numbers 10 / 9 8 / / 5 7 7 6

Categories : Java

Why does BUILD-MAX-HEAP take time O(n) while HEAP-SORT takes O(nlgn) time?
In building a heap, we always "HEAPIFY" the element starting from the bottom, but when sorting it, we always "HEAPIFY" the top most element. In both the case, the height is varying but point to note: *In building a heap, maximum elements which we heapify lie at the bottom and they get very less height to heapify hence O(n), but while sorting we always heapify top most element. Even though the height is decreasing it is not as advantageous as in the prior case. * I hope you understand what I'm trying to say.

Categories : Performance

C++ overloading > for priority_queue (min heap): yields "invalid operands to binary expression ('const Node' and 'const Node')" on push() for heap
You must mark the operator as const: bool operator> (const Node &rhs) const { return d > rhs.d; } EDIT If you don't want to overload operators, you can provide your own comparator to the queue: struct Comparator { bool operator() (const Node &lhs, const Node &rhs) const { return lhs.d > rhs.d; } }; void foo(const vector<Node> &list) { priority_queue<Node, vector<Node>, Comparator> q; q.push(list[0]); } EDIT 2 Here's how you could use a custom map: struct Comparator { typedef std::map<Node, float> Map; explicit Comparator(const Map &map) : map(&map) {} bool operator() (const Node &lhs, const Node &rhs) const { return map->find(lhs)->second > map->find(rhs)->second; }

Categories : C++

Cause of flv corruption in AIR output?
Well, the answer seems to be: don't load in video files from an external .swc. I moved all the movieclips containing video into my main .flv and the corruption is gone. I don't understand it, but I'll take it.

Categories : Actionscript

Data corruption in stm32l in c
Found the problem, it was packing, fixed it by doing this--> typedef PACKED struct _test { ... uint8_t txsize[5]; uint32_t u32baudrate; uint8_t flowcontrol; ... }test;

Categories : C

Can't eliminate Access corruption
Some of the things I do and use when debugging Access: Test my app in a number of VM. You can use HyperV on Win8, VMWare or VirtualBox to set up various controlled test environments, like testing on WinXP, Win7, Win8, 32bit or 64 bits, just anything that matches the range of OS and bitness of your users. I use vbWatchDog, a clever utility that only adds a few classes to your application (no external dependency) and allows you to trap errors at high level, and show you exactly where they happen. This is invaluable to catch and record strange errors, especially in the field. If the issue appears isolated to one or a few users only, I would try to find out what is special about their config. If nothing seems out of place, I would completely unsintall all Office component and re-install it a

Categories : Vba

glibc detected; memory corruption
Sometimes output gets stuck in the write buffer and never actually gets written to the console if the program exits prematurely. Calling fflush(stdout); will help you determine if this is the case. Or else use fprintf(stderr, ...) for debug output, since stderr is unbuffered. More likely, however, is that your program actually does crash inside the one major task that takes place between printing "realizing" and "blur initial"... the Image<uint8_t> copy constructor. Why you're passing by value and causing a copy is beyond me, I would prefer a const reference there to avoid copying a large object. Still, if you have a bug in your copy constructor it's definitely worth finding and fixing that first.

Categories : C++

std::string internal buffer corruption?
s._Bx._Buf is not a pointer, it's the internal small buffer std::string uses for holding small strings. This is called the small-buffer-optimization, or SBO. s._Bx is a union of the buffer and _Ptr, a pointer to the heap buffer that is allocated if the internal buffer is too small. So for small strings, s._Bx._Ptr should be invalid; after all, its storage is being used for the small string. Anyway ... if you get an access violation, all is not well. In such cases, the most likely cause is that you accidentally messed with the std::string's memory, most likely due to some buffer overflow or use-after-free somewhere. It's not the assignment that's interesting, it's what happens before it.

Categories : Visual C++

Can unsafe code in C# cause memory corruption?
Accessing a pointer to an invalid random memory location If it is a read, it is safe. If it was a write it is unsafe if the memory location happened to be valid, but you did not own it. You'll be scribbling over random memory locations. And as a corollary, is it safe to catch AccessViolationExceptions from unsafe code? No, because that exception tells you a) that you have a bug and b) that memory might be corrupted which cannot be repaired. Catch it and tear down the process asap.

Categories : C#

Screen corruption when using Opengl Buffers
SFML but it can only saves/restores OpenGL 2.x states. We must disable what we enable in +3.x states. It works adding: It's fixed adding at the end of own drawing something like: glBindBuffer( GL_ARRAY_BUFFER, 0 ); glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, 0 ); glBindTexture( GL_TEXTURE_2D, 0 ); glDisableVertexAttribArray( 0 ); glUseProgram( 0 );

Categories : C++

Corruption when passing reference argument to dll
You are looking at a release build, so the debugger will not be able to display all values because the optimisations will remove some objects. I think you went down a rabbit hole with the "corruption". You say the error is error -2, could not find a writer for the specified extension so have you looked to find out why this is? What writer is used in Debug mode, and why isn't is available in Release mode. It may just be a missing DLL in your working directory. I recommend changing your output filename too, so you don't get confused with output from each build. .ImagesDebugcalibration_ref.bmp might be better as .ImagesReleasecalibration_ref.bmp, for example.

Categories : C++

double free or corruption (fasttop):
You cannot work with objects of string class this way. memcpy(arr , &temp1 , temp1.size()); should be temp1.copy(arr, temp1.size()); And memcpy(&temp2 , arr , temp1.size()); should be std::string temp2(arr, temp1.size());

Categories : C++

glibc detected-double free or corruption
The posted code doesn't compile (I guess the missing } is at the end), but I can point out some problems: you don't nul-terminate buff after reading it, so strchr and/or strtok could go off the end you strcat into fixed-size buffers, without checking whether the thing you're copying fits. You could easily write off the end of your buffers here you fclose(ft) multiple times. You must do this only once, outside the loop You should fix all three, and post your new compilable code if there's still an error.

Categories : C

Is there any possiblity of Memory corruption or segment fault?
Don't confuse processes and threads. With processes, nothing can happen at all. With threads, if your function works straightforward and doesn't touch or use any shared resources, it should work as well.

Categories : C

run glibc memory corruption test manually
enabling debug info with -g causes more issues to be reported. That is not how glibc heap corruption detection works. Is there any way to call the glibc heap metadata consistency check manually Yes: http://www.gnu.org/software/libc/manual/html_node/Heap-Consistency-Checking.html See also MALLOC_CHECK_ environment variable description.

Categories : Debugging

memory corruption passing string from c++ dll to mono (C#)
You are returning descstr.c_str() which is declared on the stack in your getdescstring function. The memory it refers to is invalid as soon as the function returns. Try making descstr.c_str() so it stays in scope (e.g. as a global variable).

Categories : C#

std::remove_if/find_if: Double free or corruption
You appear to be using found without checking if it's valid or not. If you were to fail to find a value and find_if returned serviceList->end(), you'd be dereferencing serviceList->end(). The variable you're storing this dereferenced value to is the one that's causing you trouble later when you attempt to delete it. Are you sure you're actually finding a matching value?

Categories : C++



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