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From fa9ad46e1a4b3707a465bccf6f4431db7a647a08 Mon Sep 17 00:00:00 2001
From: Markus Armbruster <armbru@redhat.com>
Date: Fri, 28 Oct 2011 17:07:02 +0200
Subject: [PATCH] acl: Fix use after free in qemu_acl_reset()
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Reproducer:

    $ MALLOC_PERTURB_=234 qemu-system-x86_64 -vnc :0,acl,sasl [...]
    QEMU 0.15.50 monitor - type 'help' for more information
    (qemu) acl_add vnc.username fred allow
    acl: added rule at position 1
    (qemu) acl_reset vnc.username
    Segmentation fault (core dumped)

Spotted by Coverity.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
(cherry picked from commit 0ce6a434176e274a7e86bcaa268542c5cc402696)

Signed-off-by: Bruce Rogers <brogers@suse.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
---
 acl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/acl.c b/acl.c
index 82c2704..cae059f 100644
--- a/acl.c
+++ b/acl.c
@@ -95,13 +95,13 @@ int qemu_acl_party_is_allowed(qemu_acl *acl,
 
 void qemu_acl_reset(qemu_acl *acl)
 {
-    qemu_acl_entry *entry;
+    qemu_acl_entry *entry, *next_entry;
 
     /* Put back to deny by default, so there is no window
      * of "open access" while the user re-initializes the
      * access control list */
     acl->defaultDeny = 1;
-    QTAILQ_FOREACH(entry, &acl->entries, next) {
+    QTAILQ_FOREACH_SAFE(entry, &acl->entries, next, next_entry) {
         QTAILQ_REMOVE(&acl->entries, entry, next);
         free(entry->match);
         free(entry);
-- 
1.7.11.2