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apps/app_queue: Prevent possible crash when evaluating queue penalty rules

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Although it only occurred once, a crash occurred when a queue attempted to
evaluate a queue penalty rule that appeared to have already been destroyed.
In many locations in app_queue, a test is done to see if qe->pr is NULL;
however, when we dispose of a queue's penalty rules, we don't set the pointer
to NULL after free'ing it. This patch does that to prevent any dangling
pointers from lingering on the queue object.

Review: https://reviewboard.asterisk.org/r/4522

ASTERISK-23319 #close
Reported by: Vadim
patches:
  rb4552.patch submitted by Stefan Engström (License 6691)
........

Merged revisions 434448 from http://svn.asterisk.org/svn/asterisk/branches/11
........

Merged revisions 434449 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@434450 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Matthew Jordan
2015-04-09 02:05:26 +00:00
parent a759714101
commit 2201e27340
1 changed files with 1 additions and 0 deletions
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apps/app_queue.c
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@@ -3941,6 +3941,7 @@ static void leave_queue(struct queue_ent *qe)
while ((pr_iter = AST_LIST_REMOVE_HEAD(&qe->qe_rules, list))) {
ast_free(pr_iter);
}
qe->pr = NULL;
snprintf(posstr, sizeof(posstr), "%d", qe->pos);
pbx_builtin_setvar_helper(qe->chan, "QUEUEPOSITION", posstr);
} else {