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runtime-error - 地址 sanitizer : heap-use-after-free ANSI C

转载 作者:行者123 更新时间:2023-12-04 04:13:47 29 4
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当我尝试清除链接列表时出现此错误

=================================================================
==4574==ERROR: AddressSanitizer: heap-use-after-free on address 0x603000000050 at pc 0x7fcb73b40682 bp 0x7ffffcfd8370 sp 0x7ffffcfd8368
READ of size 8 at 0x603000000050 thread T0
#0 0x7fcb73b40681 in clear_dict ../src/utils_dict.c:83
#1 0x7fcb73b4193c in morsec ../src/morsec.c:37
#2 0x7fcb73b419e2 in main ../src/morsec.c:45
#3 0x7fcb72b8409a in __libc_start_main ../csu/libc-start.c:308
#4 0x7fcb73b40189 in _start (/mnt/c/Code/WEC-01/morsec+0x2189)

0x603000000050 is located 16 bytes inside of 24-byte region [0x603000000040,0x603000000058)
freed by thread T0 here:
#0 0x7fcb72e18fb0 in __interceptor_free (/usr/lib/x86_64-linux-gnu/libasan.so.5+0xe8fb0)
#1 0x7fcb73b405d7 in del_node ../src/utils_dict.c:70
#2 0x7fcb73b40698 in clear_dict ../src/utils_dict.c:84
#3 0x7fcb73b4193c in morsec ../src/morsec.c:37
#4 0x7fcb73b419e2 in main ../src/morsec.c:45
#5 0x7fcb72b8409a in __libc_start_main ../csu/libc-start.c:308

previously allocated by thread T0 here:
#0 0x7fcb72e19330 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0xe9330)
#1 0x7fcb73b40266 in new_node ../src/utils_dict.c:20
#2 0x7fcb73b416aa in get_dict ../src/parser.c:50
#3 0x7fcb73b4186d in morsec ../src/morsec.c:19
#4 0x7fcb73b419e2 in main ../src/morsec.c:45
#5 0x7fcb72b8409a in __libc_start_main ../csu/libc-start.c:308

SUMMARY: AddressSanitizer: heap-use-after-free ../src/utils_dict.c:83 in clear_dict
Shadow bytes around the buggy address:
0x0c067fff7fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c067fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c067fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c067fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c067fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c067fff8000: fa fa fd fd fd fa fa fa fd fd[fd]fa fa fa 00 00
0x0c067fff8010: 00 fa fa fa 00 00 00 fa fa fa 00 00 00 fa fa fa
0x0c067fff8020: 00 00 00 fa fa fa 00 00 00 06 fa fa 00 00 00 fa
0x0c067fff8030: fa fa 00 00 00 fa fa fa 00 00 00 fa fa fa 00 00
0x0c067fff8040: 01 fa fa fa 00 00 00 fa fa fa 00 00 00 fa fa fa
0x0c067fff8050: 00 00 00 fa fa fa 00 00 00 fa fa fa 00 00 00 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
==4574==ABORTING

这是我写的函数,ASAN 说它在 clear_dict 中,我尝试调试它并且 ASAN 仅在运行 clear_dict 的第三或第四次触发,我真的无法解决这个错误
struct s_dict
{
char *word;
char *symb;
struct s_dict *next;
};
typedef struct s_dict t_dict;

t_dict *new_node(char *word, char *symb)
{
t_dict *new;

new = NULL;
if (!(new = (t_dict*)malloc(sizeof(t_dict))))
return (NULL);
new->word = word;
new->symb = symb;
new->next = NULL;
return (new);
}

void del_node(t_dict *node)
{
if (node->word)
free(node->word);
node->word = NULL;
if (node->symb)
free(node->symb);
node->symb = NULL;
if (node->next)
free(node->next);
node->next = NULL;
if (node)
free(node);
node = NULL;
}

void clear_dict(t_dict **chain)
{
t_dict *tmp;

while (chain && *chain)
{
tmp = (*chain)->next; << line 83 in my code
del_node(*chain);
*chain = tmp;
}
}

我不知道是什么导致了错误,它说
free(): double free detected in tcache 2
[1] 4601 abort (core dumped)

不使用时 -fsanitize=address

感谢您抽出宝贵时间。

最佳答案

该错误(实际上有几个)在您的 del_node() 中:它不应该触及 next节点。

照原样删除 node->next , 孤儿 node->next->word等,并在下一次迭代中设置双重删除。

附言此检查和分配在 del_node() :

    if (node)         // useless
free(node);
node = NULL; // useless

没用:如果 node是 NULL,你早就崩溃了。赋值是无用的,因为它会在从函数返回之前立即修改局部变量。

关于runtime-error - 地址 sanitizer : heap-use-after-free ANSI C,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61149072/

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