[Asterisk-code-review] channel: Fix reference counting in ast channel suppress. (asterisk[13])

[Joshua Colp]

Joshua Colp has uploaded this change for review. ( https://gerrit.asterisk.org/5843


Change subject: channel: Fix reference counting in ast_channel_suppress.
......................................................................

channel: Fix reference counting in ast_channel_suppress.

The ast_channel_suppress function wrongly decremented the
reference count of the underlying structure used to keep
track of what should be suppressed on a channel if the
function was called multiple times on the same channel.

This change cleans up the reference counting a bit so
this no longer occurs.

ASTERISK-27016

Change-Id: I2eed4077cb4916e6626f9f120b63b963acc5c136
---
M main/channel.c
1 file changed, 4 insertions(+), 3 deletions(-)



  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/43/5843/1

diff --git a/main/channel.c b/main/channel.c
index e1ee516..2addfb5 100644
--- a/main/channel.c
+++ b/main/channel.c
@@ -10822,7 +10822,7 @@
 
 int ast_channel_suppress(struct ast_channel *chan, unsigned int direction, enum ast_frame_type frametype)
 {
-	RAII_VAR(struct suppress_data *, suppress, NULL, ao2_cleanup);
+	struct suppress_data *suppress;
 	const struct ast_datastore_info *datastore_info = NULL;
 	struct ast_datastore *datastore = NULL;
 	struct ast_framehook_interface interface = {
@@ -10858,6 +10858,7 @@
 	if (framehook_id < 0) {
 		/* Hook attach failed.  Get rid of the evidence. */
 		ast_log(LOG_WARNING, "Failed to attach framehook while attempting to suppress a stream.\n");
+		ao2_ref(suppress, -1);
 		return -1;
 	}
 
@@ -10869,11 +10870,11 @@
 	if (!(datastore = ast_datastore_alloc(datastore_info, NULL))) {
 		ast_log(LOG_WARNING, "Failed to allocate datastore while attempting to suppress a stream.\n");
 		ast_framehook_detach(chan, framehook_id);
+		ao2_ref(suppress, -1);
 		return -1;
 	}
 
-	/* and another ref for the datastore */
-	ao2_ref(suppress, +1);
+	/* the ref provided by the allocation is taken by the datastore */
 	datastore->data = suppress;
 
 	ast_channel_datastore_add(chan, datastore);

-- 
To view, visit https://gerrit.asterisk.org/5843
To unsubscribe, visit https://gerrit.asterisk.org/settings

Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-MessageType: newchange
Gerrit-Change-Id: I2eed4077cb4916e6626f9f120b63b963acc5c136
Gerrit-Change-Number: 5843
Gerrit-PatchSet: 1
Gerrit-Owner: Joshua Colp <jcolp at digium.com>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.digium.com/pipermail/asterisk-code-review/attachments/20170615/1070e969/attachment.html>