Bridge system: Fix memory leaks and double frees on impart failure.

You cannot reference the passed in features struct after calling
ast_bridge_impart().  Even if the call fails.

Change-Id: I902b88ba0d5d39520e670fb635078a367268ea21

diff --git a/apps/confbridge/conf_chan_announce.c b/apps/confbridge/conf_chan_announce.c
index 8ced0cccd8bacf3847bf9139373e02473bea2185..ff30499086c5f92714aedfe4c8a5f01f5cdf496c 100644 (file)
--- a/apps/confbridge/conf_chan_announce.c
+++ b/apps/confbridge/conf_chan_announce.c
@@ -199,7 +199,6 @@ int conf_announce_channel_push(struct ast_channel *ast)
        /* Impart the output channel into the bridge */
        if (ast_bridge_impart(p->bridge, chan, NULL, features,
                AST_BRIDGE_IMPART_CHAN_DEPARTABLE)) {
-               ast_bridge_features_destroy(features);
                ast_channel_unref(chan);
                return -1;
        }

diff --git a/include/asterisk/features.h b/include/asterisk/features.h
index b63124c2f1f3c91b7a08d68c2a1dfde3d15e938a..a4aed5d18cb0cc2ecf75e1b70700127849b14b9c 100644 (file)
--- a/include/asterisk/features.h
+++ b/include/asterisk/features.h
@@ -51,6 +51,7 @@ int ast_bridge_call(struct ast_channel *chan, struct ast_channel *peer, struct a
 /*!
  * \brief Bridge a call, and add additional flags to the bridge
  *
+ * \details
  * This does the same thing as \ref ast_bridge_call, except that once the bridge
  * is created, the provided flags are set on the bridge. The provided flags are
  * added to the bridge's flags; they will not clear any flags already set.
@@ -70,6 +71,7 @@ int ast_bridge_call_with_flags(struct ast_channel *chan, struct ast_channel *pee
  * \brief Add an arbitrary channel to a bridge
  * \since 12.0.0
  *
+ * \details
  * The channel that is being added to the bridge can be in any state: unbridged,
  * bridged, answered, unanswered, etc. The channel will be added asynchronously,
  * meaning that when this function returns once the channel has been added to
@@ -87,11 +89,16 @@ int ast_bridge_call_with_flags(struct ast_channel *chan, struct ast_channel *pee
  * \param features Features for this channel in the bridge
  * \param play_tone Indicates if a tone should be played to the channel
  * \param xfersound Sound that should be used to indicate transfer with play_tone
+ *
+ * \note The features parameter must be NULL or obtained by
+ * ast_bridge_features_new().  You must not dereference features
+ * after calling even if the call fails.
+ *
  * \retval 0 Success
  * \retval -1 Failure
  */
 int ast_bridge_add_channel(struct ast_bridge *bridge, struct ast_channel *chan,
-               struct ast_bridge_features *features, int play_tone, const char *xfersound);
+       struct ast_bridge_features *features, int play_tone, const char *xfersound);
 
 
 

diff --git a/main/bridge.c b/main/bridge.c
index a56555bc9faf151fd7db638d70d27d4277886b7f..64c750b1e6b37a289489a2240ea42f2d164667da 100644 (file)
--- a/main/bridge.c
+++ b/main/bridge.c
@@ -2318,6 +2318,9 @@ int ast_bridge_add_channel(struct ast_bridge *bridge, struct ast_channel *chan,
        if (chan_bridge) {
                struct ast_bridge_channel *bridge_channel;
 
+               /* The channel is in a bridge so it is not getting any new features. */
+               ast_bridge_features_destroy(features);
+
                ast_bridge_lock_both(bridge, chan_bridge);
                bridge_channel = bridge_find_channel(chan_bridge, chan);
 
@@ -2340,9 +2343,6 @@ int ast_bridge_add_channel(struct ast_bridge *bridge, struct ast_channel *chan,
                bridge_dissolve_check_stolen(chan_bridge, bridge_channel);
                ast_bridge_unlock(chan_bridge);
                ast_bridge_unlock(bridge);
-
-               /* The channel was in a bridge so it is not getting any new features. */
-               ast_bridge_features_destroy(features);
        } else {
                /* Slightly less easy case. We need to yank channel A from
                 * where he currently is and impart him into our bridge.
@@ -2350,6 +2350,7 @@ int ast_bridge_add_channel(struct ast_bridge *bridge, struct ast_channel *chan,
                yanked_chan = ast_channel_yank(chan);
                if (!yanked_chan) {
                        ast_log(LOG_WARNING, "Could not gain control of channel %s\n", ast_channel_name(chan));
+                       ast_bridge_features_destroy(features);
                        return -1;
                }
                if (ast_channel_state(yanked_chan) != AST_STATE_UP) {

diff --git a/main/core_unreal.c b/main/core_unreal.c
index 377abd1ffac0430312bbaa0e5e819dd56df11246..28886b63595c15b6f06e65b262516b4fc3709e25 100644 (file)
--- a/main/core_unreal.c
+++ b/main/core_unreal.c
@@ -805,7 +805,6 @@ int ast_unreal_channel_push_to_bridge(struct ast_channel *ast, struct ast_bridge
        /* Impart the semi2 channel into the bridge */
        if (ast_bridge_impart(bridge, chan, NULL, features,
                AST_BRIDGE_IMPART_CHAN_INDEPENDENT)) {
-               ast_bridge_features_destroy(features);
                ast_channel_unref(chan);
                return -1;
        }

diff --git a/main/features.c b/main/features.c
index 618f91c52d34a2a5a288d21590ef9c592041e374..7dfe4cde57693168e75999da4058668e527b7d69 100644 (file)
--- a/main/features.c
+++ b/main/features.c
@@ -1103,7 +1103,6 @@ static int bridge_exec(struct ast_channel *chan, const char *data)
                xfer_cfg ? xfer_cfg->xfersound : NULL);
        ao2_cleanup(xfer_cfg);
        if (bridge_add_failed) {
-               ast_bridge_features_destroy(peer_features);
                ast_bridge_features_cleanup(&chan_features);
                ast_bridge_destroy(bridge, 0);
                goto done;