one strange bug
void my_test()
{
FILE * file = fopen( "/root/todo ", "r ");
if(file == NULL)
{
return NULL;
}
char * t;
while((t = my_readline(file,256))!= NULL)
{
free(t);
t = NULL;
}
fclose(file);
file = NULL;
char* fileName = calloc(100,1);
strcpy(fileName, "/root/back/20070411192812592.jpg ");
char* split_name = strrchr(fileName, '/ ');
char* word = strdup(split_name);
int size = strlen(word);
unsigned char* result = calloc(2*size,1);
int i = 0;
int j = 0;
while(i <size)
{
*(result+j) = 0x00;
*(result+j+1) = *(word+i);
i++;
j = j + 2;
}
*(result+j) = 0x00;
*(result+j+1) = 0x00;
uint8_t *buf;
int file_size = 43069;
printf( "1\n ");
buf = malloc(file_size);
}
这段代码会在执行到最后一句话 buf = malloc(file_size)的时候报错，错误代码是。
*** glibc detected *** ./btserver: malloc(): memory corruption: 0x081200c0 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7ec2ef3]
/lib/tls/i686/cmov/libc.so.6(__libc_malloc+0x7e)[0xb7ec460e]
./btserver[0x804c54d]
./btserver[0x804c325]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xdc)[0xb7e70ebc]
./btserver[0x8049d91]
======= Memory map: ========
08048000-0807a000 r-xp 00000000 16:01 311637 /root/project/btserver/trunk/Debug/btserver
0807a000-0807d000 rw-p 00031000 16:01 311637 /root/project/btserver/trunk/Debug/btserver
0807d000-08141000 rw-p 0807d000 00:00 0 [heap]
b7d00000-b7d21000 rw-p b7d00000 00:00 0
b7d21000-b7e00000 ---p b7d21000 00:00 0
b7e59000-b7e5b000 rw-p b7e59000 00:00 0
b7e5b000-b7f96000 r-xp 00000000 16:01 4293890 /lib/tls/i686/cmov/libc-2.5.so
b7f96000-b7f97000 r--p 0013b000 16:01 4293890 /lib/tls/i686/cmov/libc-2.5.so
b7f97000-b7f99000 rw-p 0013c000 16:01 4293890 /lib/tls/i686/cmov/libc-2.5.so
b7f99000-b7f9c000 rw-p b7f99000 00:00 0
b7f9c000-b7faf000 r-xp 00000000 16:01 4293916 /lib/tls/i686/cmov/libpthread-2.5.so
b7faf000-b7fb1000 rw-p 00013000 16:01 4293916 /lib/tls/i686/cmov/libpthread-2.5.so
b7fb1000-b7fb3000 rw-p b7fb1000 00:00 0
b7fb5000-b7fc0000 r-xp 00000000 16:01 4259904 /lib/libgcc_s.so.1
b7fc0000-b7fc1000 rw-p 0000a000 16:01 4259904 /lib/libgcc_s.so.1
b7fc1000-b7fc4000 rw-p b7fc1000 00:00 0
b7fc4000-b7fdd000 r-xp 00000000 16:01 4259861 /lib/ld-2.5.so
b7fdd000-b7fdf000 rw-p 00019000 16:01 4259861 /lib/ld-2.5.so
bfe2f000-bfe45000 rw-p bfe2f000 00:00 0 [stack]
ffffe000-fffff000 r-xp 00000000 00:00 0 [vdso]
Aborted (core dumped)
而且我完全不知道为什么这段代码会报这个错误.
any one can help me?
[解决办法]
Follow your test result, We can make sure your pre-codes impact the memory allocated.
I think it may cause memory broken by my experience.
Have a test as following suggestion, move the definition of varible buf on the top ,
and you 'd better call free() to free the appropriate memory include the pointer returned by strdup() and memory you call calloc() to allocate.
I think it has nothing to do with the platform, try again! good luck
[解决办法]
It 's funny to see this conversation, to see how desperate we people want to be to learn english. It is always not a good idea to talk with your own people when you want to learn a foreign language.
Any way, to kulasama(酷拉), have you realized that you have a serious buffer overflow in your code?
When you write
"*(result+j) = 0x00;
*(result+j+1) = 0x00; "
you acturally access the memory across the alloced boundary, no matter it may or may not crab the memory system, it is not a good thing you what.
Fix it, and try your luck again.
