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acl: acl_add can't insert before last list element, fix

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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>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Markus Armbruster 2013-06-18 10:05:23 +02:00 committed by Michael Tokarev
parent f2c4ddd9c3
commit 4999f3a8a6
1 changed files with 2 additions and 2 deletions
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4
util/acl.c
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@ -138,9 +138,9 @@ int qemu_acl_insert(qemu_acl *acl,
if (index <= 0) if (index <= 0)
return -1; return -1;
if (index >= acl->nentries) if (index > acl->nentries) {
return qemu_acl_append(acl, deny, match); return qemu_acl_append(acl, deny, match);
}
entry = g_malloc(sizeof(*entry)); entry = g_malloc(sizeof(*entry));
entry->match = g_strdup(match); entry->match = g_strdup(match);