[Asterisk-code-review] bridge softmix.c: Fix crash if could not allocate the dsp. (asterisk[13])

[Richard Mudgett]

Richard Mudgett has uploaded a new change for review.

  https://gerrit.asterisk.org/2582

Change subject: bridge_softmix.c: Fix crash if could not allocate the dsp.
......................................................................

bridge_softmix.c: Fix crash if could not allocate the dsp.

Fix off nominal crash where we could not setup the channel to process
frames for the softmix bridge technology because of allocation failure.

Change-Id: Ic307a8386e46bf551e48fcd1eb97276714d56372
---
M bridges/bridge_softmix.c
1 file changed, 15 insertions(+), 4 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/82/2582/1

diff --git a/bridges/bridge_softmix.c b/bridges/bridge_softmix.c
index b463f99..e3df18f 100644
--- a/bridges/bridge_softmix.c
+++ b/bridges/bridge_softmix.c
@@ -357,6 +357,7 @@
 {
 	struct softmix_channel *sc = bridge_channel->tech_pvt;
 	struct ast_format *slin_format;
+	int setup_fail;
 
 	slin_format = ast_format_cache_get_slin_by_rate(rate);
 
@@ -386,17 +387,24 @@
 	sc->read_slin_format = slin_format;
 
 	/* Setup smoother */
-	ast_slinfactory_init_with_format(&sc->factory, slin_format);
+	setup_fail = ast_slinfactory_init_with_format(&sc->factory, slin_format);
 
 	/* set new read and write formats on channel. */
 	ast_channel_lock(bridge_channel->chan);
-	ast_set_read_format_path(bridge_channel->chan,
+	setup_fail |= ast_set_read_format_path(bridge_channel->chan,
 		ast_channel_rawreadformat(bridge_channel->chan), slin_format);
 	ast_channel_unlock(bridge_channel->chan);
-	ast_set_write_format(bridge_channel->chan, slin_format);
+	setup_fail |= ast_set_write_format(bridge_channel->chan, slin_format);
 
 	/* set up new DSP.  This is on the read side only right before the read frame enters the smoother.  */
 	sc->dsp = ast_dsp_new_with_rate(rate);
+	if (setup_fail || !sc->dsp) {
+		/* Bad news.  Could not setup the channel for softmix. */
+		ast_mutex_unlock(&sc->lock);
+		ast_bridge_channel_leave_bridge(bridge_channel, BRIDGE_CHANNEL_STATE_END, 0);
+		return;
+	}
+
 	/* we want to aggressively detect silence to avoid feedback */
 	if (bridge_channel->tech_args.talking_threshold) {
 		ast_dsp_set_threshold(sc->dsp, bridge_channel->tech_args.talking_threshold);
@@ -616,7 +624,10 @@
 		ast_channel_unlock(bridge_channel->chan);
 	}
 
-	ast_dsp_silence_with_energy(sc->dsp, frame, &totalsilence, &cur_energy);
+	/* The channel will be leaving soon if there is no dsp. */
+	if (sc->dsp) {
+		ast_dsp_silence_with_energy(sc->dsp, frame, &totalsilence, &cur_energy);
+	}
 
 	if (bridge->softmix.video_mode.mode == AST_BRIDGE_VIDEO_MODE_TALKER_SRC) {
 		int cur_slot = sc->video_talker.energy_history_cur_slot;

-- 
To view, visit https://gerrit.asterisk.org/2582
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Gerrit-MessageType: newchange
Gerrit-Change-Id: Ic307a8386e46bf551e48fcd1eb97276714d56372
Gerrit-PatchSet: 1
Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-Owner: Richard Mudgett <rmudgett at digium.com>