AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-11-22 13:00:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

Fix race in free sanity check.

Browse Source
This commit is contained in:
Ulrich Drepper 2010-05-06 04:42:46 -07:00
parent d84acf388e
commit 5f24d53acb
3 changed files with 15334 additions and 15326 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15324
ChangeLog
View File

File diff suppressed because it is too large Load Diff

15321
ChangeLog.17 Normal file
View File

File diff suppressed because it is too large Load Diff

13
malloc/malloc.c
View File

@ -4859,6 +4859,7 @@ _int_free(mstate av, mchunkptr p)
#ifdef ATOMIC_FASTBINS
mchunkptr fd;
mchunkptr old = *fb;
unsigned int old_idx = ~0u;
do
{
/* Another simple check: make sure the top of the bin is not the
@ -4868,15 +4869,17 @@ _int_free(mstate av, mchunkptr p)
errstr = "double free or corruption (fasttop)";
goto errout;
}
if (old != NULL
&& __builtin_expect (fastbin_index(chunksize(old)) != idx, 0))
if (old != NULL)
old_idx = fastbin_index(chunksize(old));
p->fd = fd = old;
}
while ((old = catomic_compare_and_exchange_val_rel (fb, p, fd)) != fd);
if (fd != NULL && __builtin_expect (old_idx != idx, 0))
{
errstr = "invalid fastbin entry (free)";
goto errout;
}
p->fd = fd = old;
}
while ((old = catomic_compare_and_exchange_val_rel (fb, p, fd)) != fd);
#else
/* Another simple check: make sure the top of the bin is not the
record we are going to add (i.e., double free). */