GlibC Double free or corruption (fclose)

I got an error on my C program on runtime. I found some stuff about "double free or corruption" error but nothing relevant.

Here is my code :

void compute_crc32(const char* filename, unsigned long * destination)
{
  FILE* tmp_chunk = fopen(filename, "rb");
  printf("\n\t\t\tCalculating CRC...");
  fflush(stdout);
  Crc32_ComputeFile(tmp_chunk, destination);
  printf("\t[0x%08lX]", *destination);
  fflush(stdout);
  fclose(tmp_chunk);
  printf("\t[ OK ]");
  fflush(stdout);
}

It seems the

fclose(tmp_chunk);

raises this glibc error :

*** glibc detected *** ./crc32: double free or corruption (out): 0x09ed86f0 ***

======= Backtrace: =========
/lib/i386-linux-gnu/libc.so.6(+0x75ee2)[0xb763cee2]
/lib/i386-linux-gnu/libc.so.6(fclose+0x154)[0xb762c424]
./crc32[0x80498be]
./crc32[0x8049816]
./crc32[0x804919c]
./crc32[0x8049cc2]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0xb75e04d3]
./crc32[0x8048961]

In the console output, the last CRC is displayed but not the last "[ OK ]"...

I never have this type of error and I searched for hours on Google but nothing really interesting in my case... please help :)

Now I have another error :

*** glibc detected *** ./xsplit: free(): invalid next size (normal): 0x095a66f0 ***
======= Backtrace: =========
/lib/i386-linux-gnu/libc.so.6(+0x75ee2)[0xb7647ee2]
/lib/i386-linux-gnu/libc.so.6(fclose+0x154)[0xb7637424]
./xsplit[0x80497f7]
./xsplit[0x804919c]
./xsplit[0x8049cd6]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0xb75eb4d3]
./xsplit[0x8048961]

What the hell is this ? I'm lost... :(