diff options
Diffstat (limited to 'malloc/malloc.c')
| -rw-r--r-- | malloc/malloc.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c index b43e454f6e..acf1bec500 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -1,5 +1,5 @@ /* Malloc implementation for multiple threads without lock contention. - Copyright (C) 1996-2006, 2007, 2008, 2009 Free Software Foundation, Inc. + Copyright (C) 1996-2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Wolfram Gloger <wg@malloc.de> and Doug Lea <dl@cs.oswego.edu>, 2001. @@ -4850,7 +4850,8 @@ _int_free(mstate av, mchunkptr p) free_perturb (chunk2mem(p), size - SIZE_SZ); set_fastchunks(av); - fb = &fastbin (av, fastbin_index(size)); + unsigned int idx = fastbin_index(size); + fb = &fastbin (av, idx); #ifdef ATOMIC_FASTBINS mchunkptr fd; @@ -4864,6 +4865,12 @@ _int_free(mstate av, mchunkptr p) errstr = "double free or corruption (fasttop)"; goto errout; } + if (old != NULL && (chunksize(old) > request2size(MAX_FAST_SIZE) + || fastbin_index(chunksize(old)) != idx)) + { + errstr = "invalid fastbin entry (free)"; + goto errout; + } p->fd = fd = old; } while ((old = catomic_compare_and_exchange_val_rel (fb, p, fd)) != fd); @@ -4875,6 +4882,12 @@ _int_free(mstate av, mchunkptr p) errstr = "double free or corruption (fasttop)"; goto errout; } + if (*fb != NULL && (chunksize(*fb) > request2size(MAX_FAST_SIZE) + || fastbin_index(chunksize(*fb)) != idx)) + { + errstr = "invalid fastbin entry (free)"; + goto errout; + } p->fd = *fb; *fb = p; |