[Qemu-devel] [PATCH] acl: acl_add can't insert before last list element, fix

[Markus Armbruster <armbru@redhat.com>]

Watch this:

    $ upstream-qemu -nodefaults -S -vnc :0,acl,sasl -monitor stdio
    QEMU 1.5.50 monitor - type 'help' for more information
    (qemu) acl_add vnc.username drei allow
    acl: added rule at position 1
    (qemu) acl_show vnc.username
    policy: deny
    1: allow drei
    (qemu) acl_add vnc.username zwei allow 1
    acl: added rule at position 2
    (qemu) acl_show vnc.username
    policy: deny
    1: allow drei
    2: allow zwei
    (qemu) acl_add vnc.username eins allow 1
    acl: added rule at position 1
    (qemu) acl_show vnc.username
    policy: deny
    1: allow eins
    2: allow drei
    3: allow zwei

The second acl_add inserts at position 2 instead of 1.

Root cause is an off-by-one in qemu_acl_insert(): when index ==
acl->nentries, it appends instead of inserting before the last list
element.

Cc: qemu-stable@nongnu.org
Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 util/acl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/util/acl.c b/util/acl.c
index a7f33ff..938b7ae 100644
--- a/util/acl.c
+++ b/util/acl.c
@@ -138,9 +138,9 @@ int qemu_acl_insert(qemu_acl *acl,
 
     if (index <= 0)
         return -1;
-    if (index >= acl->nentries)
+    if (index > acl->nentries) {
         return qemu_acl_append(acl, deny, match);
-
+    }
 
     entry = g_malloc(sizeof(*entry));
     entry->match = g_strdup(match);
-- 
1.7.11.7