我有一个表格的结构
struct pixel_graph_header {
int pixels[ROWS][COLS];
};
typedef struct pixel_graph_header* graph;
ROWS和COLS都被编译器指令设置为1000。我正在尝试初始化并分配图表。这是我目前拥有的：
graph pixel_graph_new(int pixels[ROWS][COLS], int img_height, int img_width) {
graph ret = malloc(sizeof(graph)); \\line 24
for (unsigned int i = 0; i < img_height; i++){
for (unsigned int j = 0; j < img_width; j++) {
ret->pixels[i][j] = pixels[i][j]; \\line 29
}
}
}
我从G = pixel_graph_new(width, height, pixels);的测试文件中调用它，其中width = 128，height = 128和pixels是一个1000x1000数组，在128x128子集中有有用的数据。编译很好，但是当我运行它时，我遇到了问题。我正在使用ASan，我收到此错误：
==98106==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6020000000f8 at pc 0x00010d0796e1 bp 0x7ffee284a010 sp 0x7ffee28497c0
WRITE of size 512 at 0x6020000000f8 thread T0
#0 0x10d0796e0 in __asan_memcpy (libclang_rt.asan_osx_dynamic.dylib:x86_64h+0x546e0)
#1 0x10cfe8320 in pixel_graph_new graph.c:29
#2 0x10cfe8d09 in main unionfind_test.c:17
#3 0x7fff5c23eed8 in start (libdyld.dylib:x86_64+0x16ed8)
0x6020000000f8 is located 0 bytes to the right of 8-byte region [0x6020000000f0,0x6020000000f8)
allocated by thread T0 here:
#0 0x10d07bf53 in wrap_malloc (libclang_rt.asan_osx_dynamic.dylib:x86_64h+0x56f53)
#1 0x10cfe82b2 in pixel_graph_new graph.c:24
#2 0x10cfe8d09 in main unionfind_test.c:17
#3 0x7fff5c23eed8 in start (libdyld.dylib:x86_64+0x16ed8)
SUMMARY: AddressSanitizer: heap-buffer-overflow (libclang_rt.asan_osx_dynamic.dylib:x86_64h+0x546e0) in __asan_memcpy
Shadow bytes around the buggy address:
0x1c03ffffffc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1c03ffffffd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1c03ffffffe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1c03fffffff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1c0400000000: fa fa fd fd fa fa fd fd fa fa 00 00 fa fa 00 00
=>0x1c0400000010: fa fa 00 04 fa fa 00 00 fa fa 00 06 fa fa 00[fa]
0x1c0400000020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x1c0400000030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x1c0400000040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x1c0400000050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x1c0400000060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==98106==ABORTING
Abort trap: 6
我不知道造成这种情况的原因。我可以查看sizeof，看看为ret -> pixels分配了一个1000x1000的int数组。如果我用ret->pixels[i][j]替换ret -> pixels[0][0]，我会遇到同样的问题所以我不认为这是一个超出范围的错误。我无法从ret->pixels[0][0]读取，它基本上抛出相同的错误，除了读取而不是写入。
你有typedef struct pixel_graph_header* graph;。这意味着malloc(sizeof(graph));分配足够的空间来保存指向struct pixel_graph_header的指针。你需要的是整个struct pixel_graph_header足够的空间，所以使用malloc(sizeof(struct pixel_graph_header));代替。