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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 d87631d21f
commit cad50d6dbf
5 changed files with 15 additions and 7 deletions
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4
bridges/bridge_softmix.c
View File

@@ -2085,7 +2085,9 @@ static void remb_enable_collection(struct ast_bridge *bridge, struct ast_bridge_
}
}
if (AST_VECTOR_REPLACE(&softmix_data->remb_collectors, bridge_stream_position, ao2_bump(sc->remb_collector))) {
ao2_ref(sc->remb_collector, +1);
if (AST_VECTOR_REPLACE(&softmix_data->remb_collectors, bridge_stream_position,
sc->remb_collector)) {
ao2_ref(sc->remb_collector, -1);
}
}

5
res/res_pjsip/pjsip_options.c
View File

@@ -1530,10 +1530,11 @@ static int sip_options_endpoint_compositor_add_task(void *obj)
ast_debug(3, "Adding endpoint compositor '%s' to AOR '%s'\n",
task_data->endpoint_state_compositor->name, task_data->aor_options->name);
ao2_ref(task_data->endpoint_state_compositor, +1);
if (AST_VECTOR_APPEND(&task_data->aor_options->compositors,
ao2_bump(task_data->endpoint_state_compositor))) {
task_data->endpoint_state_compositor)) {
/* Failed to add so no need to update the endpoint status. Nothing changed. */
ao2_cleanup(task_data->endpoint_state_compositor);
ao2_ref(task_data->endpoint_state_compositor, -1);
return 0;
}

3
res/res_pjsip_history.c
View File

@@ -1133,7 +1133,8 @@ static struct vector_history_t *filter_history(struct ast_cli_args *a)
} else if (!res) {
continue;
} else {
if (AST_VECTOR_APPEND(output, ao2_bump(entry))) {
ao2_bump(entry);
if (AST_VECTOR_APPEND(output, entry)) {
ao2_cleanup(entry);
}
}

5
res/res_pjsip_session.c
View File

@@ -250,7 +250,10 @@ struct ast_sip_session_media_state *ast_sip_session_media_state_clone(const stru
struct ast_sip_session_media *session_media = AST_VECTOR_GET(&media_state->sessions, index);
enum ast_media_type type = ast_stream_get_type(ast_stream_topology_get_stream(cloned->topology, index));
AST_VECTOR_REPLACE(&cloned->sessions, index, ao2_bump(session_media));
ao2_bump(session_media);
if (AST_VECTOR_REPLACE(&cloned->sessions, index, session_media)) {
ao2_cleanup(session_media);
}
if (ast_stream_get_state(ast_stream_topology_get_stream(cloned->topology, index)) != AST_STREAM_STATE_REMOVED &&
!cloned->default_session[type]) {
cloned->default_session[type] = session_media;

5
res/stasis/messaging.c
View File

@@ -457,8 +457,9 @@ 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;
}