about summary refs log tree commit diff
path: root/malloc
diff options
context:
space:
mode:
Diffstat (limited to 'malloc')
-rw-r--r--malloc/malloc.c17
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;