c - Valgrind 提示 "Invalid write of size 8" - IT工具网

WebInvalid read ¶ This other code will produce a Invalid read error : int main(void) { int i; int *ptr = NULL; i = *ptr; return (0); } If we compile and run this code, Valgrind will produce this error : ==26212== Invalid read of size 4 ==26212== at 0x400497: main (test.c:8) ==26212== Address 0x0 is not stack\'d, malloc\'d or (recently) free\'d greenways real estate and auction

WebIf you pass invalid pointers you'll get a 'segmentation fault' or misbehavior the same way it happens to strlen () (passing a NULL pointer to srcp, for example). And you'll need to allocate the destination string before calling the function, the same way it happens with strcpy (), for example. 08-22-2024 #5. Sir Galahad. WebMaybe you're accessing an array index that's out of bounds (valid indices range from zero to array length minus one). That's essentially dereferencing a pointer, and an example of 8 byte reads would be accessing elements of an array of 64-bit pointers (for example a hash map, or an array of children in a trie structure). WebJul 23, 2005 · Valgrind says ==11604== Invalid read of size 4 ==11604== at 0x8048ABB: main (foo.cc:36) ==11604== Address 0x1B92415C is 4 bytes inside a block of size 8 free'd greenways rent a car heraklion airport