Fix race in corruption check.

With atomic fastbins the checks performed can race with concurrent
modifications of the arena.  If we detect a problem re-do the test
after getting the lock.
(cherry picked from commit bec466d922ee22b94ac0d00415fb605e136efe6e)

1 files changed, 6 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 8a0e7ab6d1..34a5ad631c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2009-07-16  Ulrich Drepper  <drepper@redhat.com>
+	    Jakub Jelinek  <jakub@redhat.com>
+
+	* malloc/malloc.c [ATOMIC_FASTBINS] (_int_free): Make check for
+	corruption thread-safe.
+
 2009-07-13  Jakub Jelinek  <jakub@redhat.com>
 
 	* include/atomic.h (catomic_compare_and_exchange_val_rel): If arch