From: Ulrich Drepper <drepper@redhat.com>
Date: Thu, 2 Jul 2009 10:30:55 +0000 (-0700)
Subject: Fix possible race when freeing object in fast bin list.
X-Git-Tag: fedora/glibc-2.10.1-3~4^2~17
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=51da0dcf515bd63d44dd4c479147810b4f30a7f5;p=thirdparty%2Fglibc.git

Fix possible race when freeing object in fast bin list.
(cherry picked from commit 6cbbaa50aac809ad6e0692247876c82d58e466bf)
---

diff --git a/ChangeLog b/ChangeLog
index 44c96e0ee8e..fba7a5bbfdc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-07-02  Ulrich Drepper  <drepper@redhat.com>
+
+	* malloc/malloc.c [ATOMIC_FASTBINS] (_int_free): Add full barrier when
+	adding to fast bin list.
+
 2009-07-01  Ulrich Drepper  <drepper@redhat.com>
 
 	* nis/nss_nis/nis-network.c (_nss_nis_getnetbyaddr_r): Don't use
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 0b9facefd4e..703dcb56e76 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -4802,6 +4802,7 @@ _int_free(mstate av, mchunkptr p)
 	    goto errout;
 	  }
 	p->fd = fd = old;
+	atomic_full_barrier ();
       }
     while ((old = catomic_compare_and_exchange_val_acq (fb, p, fd)) != fd);
 #else