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VECTOR: Passing parameters with side effects to macros is dangerous.

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* Fix several instances where we were bumping a ref in the parameter and
then unrefing the object if it failed.  The way the AST_VECTOR_APPEND()
and AST_VECTOR_REPLACE() macros are implemented means if it fails the new
value was never evaluated.

Change-Id: I2847872a455b11ea7e5b7ce697c0a455a1d0ac9a
This commit is contained in:
Richard Mudgett
2018-06-21 16:39:45 -05:00
parent 498e775a4a
commit cb9475eb3d
3 changed files with 8 additions and 5 deletions
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5
res/stasis/messaging.c
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@@ -459,8 +459,9 @@ static struct message_subscription *get_or_create_subscription(struct ast_endpoi
ao2_link(endpoint_subscriptions, sub);
} else {
ast_rwlock_wrlock(&tech_subscriptions_lock);
if (AST_VECTOR_APPEND(&tech_subscriptions, ao2_bump(sub))) {
/* Release the ao2_bump that was for the vector and allocation references. */
ao2_ref(sub, +1);
if (AST_VECTOR_APPEND(&tech_subscriptions, sub)) {
/* Release the refs that were for the vector and the allocation. */
ao2_ref(sub, -2);
sub = NULL;
}