[Asterisk-code-review] chan sip: Fix reference leaks in error paths. (asterisk[master])

[Corey Farrell]

Corey Farrell has uploaded a new change for review.

  https://gerrit.asterisk.org/3163

Change subject: chan_sip: Fix reference leaks in error paths.
......................................................................

chan_sip: Fix reference leaks in error paths.

* get_sip_pvt_from_replaces leaks sip_pvt_ptr on any error.
* build_peer leaks peer on failure to allocate the endpoint.

This patch fixes get_sip_pvt by using an RAII_VAR, build_peer is fixed
with an unref in the appropriate place.

ASTERISK-26184 #close

Change-Id: I728b424648ad041409f7d90880f4c28b3ce2ca12
---
M channels/chan_sip.c
1 file changed, 5 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/63/3163/1

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 28379ff..599ecd6 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -18386,7 +18386,7 @@
 static int get_sip_pvt_from_replaces(const char *callid, const char *totag,
 		const char *fromtag, struct sip_pvt **out_pvt, struct ast_channel **out_chan)
 {
-	struct sip_pvt *sip_pvt_ptr;
+	RAII_VAR(struct sip_pvt *, sip_pvt_ptr, NULL, ao2_cleanup);
 	struct sip_pvt tmp_dialog = {
 		.callid = callid,
 	};
@@ -18460,6 +18460,9 @@
 			*out_chan = sip_pvt_ptr->owner ? ast_channel_ref(sip_pvt_ptr->owner) : NULL;
 		}
 	}
+
+	/* If we're here sip_pvt_ptr has been copied to *out_pvt, prevent RAII_VAR cleanup */
+	sip_pvt_ptr = NULL;
 
 	return 0;
 }
@@ -31095,6 +31098,7 @@
 			return NULL;
 		}
 		if (!(peer->endpoint = ast_endpoint_create("SIP", name))) {
+			ao2_t_ref(peer, -1, "failed to allocate endpoint, drop peer");
 			return NULL;
 		}
 		if (!(peer->caps = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I728b424648ad041409f7d90880f4c28b3ce2ca12
Gerrit-PatchSet: 1
Gerrit-Project: asterisk
Gerrit-Branch: master
Gerrit-Owner: Corey Farrell <git at cfware.com>