[Asterisk-code-review] res pjsip pubsub: segfault in function publish expire (asterisk[13])

[Alexei Gradinari]

Alexei Gradinari has uploaded this change for review. ( https://gerrit.asterisk.org/9351


Change subject: res_pjsip_pubsub: segfault in function publish_expire
......................................................................

res_pjsip_pubsub: segfault in function publish_expire

The function pubsub_on_rx_publish_request incorrectly uses
of AST_SCHED_REPLACE_UNREF.

The AST_SCHED_REPLACE_UNREF should unref old '_data'.

Because of this, there may be a double unref
of variable 'publication' when ast_sched_del is unsuccessful
that leads to use after free of the 'publication' in publish_expire.

Change-Id: Ie0f0cfc7e036953d890b188656010b325a5cdc82
---
M res/res_pjsip_pubsub.c
1 file changed, 1 insertion(+), 1 deletion(-)



  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/51/9351/1

diff --git a/res/res_pjsip_pubsub.c b/res/res_pjsip_pubsub.c
index 257922b..2f32ebc 100644
--- a/res/res_pjsip_pubsub.c
+++ b/res/res_pjsip_pubsub.c
@@ -3424,7 +3424,7 @@
 			ao2_link(handler->publications, publication);
 
 			AST_SCHED_REPLACE_UNREF(publication->sched_id, sched, expires * 1000, publish_expire, publication,
-						ao2_ref(publication, -1), ao2_ref(publication, -1), ao2_ref(publication, +1));
+						ao2_ref(_data, -1), ao2_ref(publication, -1), ao2_ref(publication, +1));
 		} else {
 			AST_SCHED_DEL_UNREF(sched, publication->sched_id, ao2_ref(publication, -1));
 		}

-- 
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Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-MessageType: newchange
Gerrit-Change-Id: Ie0f0cfc7e036953d890b188656010b325a5cdc82
Gerrit-Change-Number: 9351
Gerrit-PatchSet: 1
Gerrit-Owner: Alexei Gradinari <alex2grad at gmail.com>
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