[Asterisk-code-review] chan sip: Check sip pvt pointer in ast channel get t38 state(c) (asterisk[11])

[Joshua Colp]

Joshua Colp has uploaded a new change for review.

  https://gerrit.asterisk.org/1791

Change subject: chan_sip: Check sip_pvt pointer in ast_channel_get_t38_state(c)
......................................................................

chan_sip: Check sip_pvt pointer in ast_channel_get_t38_state(c)

Asterisk may crash when calling ast_channel_get_t38_state(c)
on a locked channel which is being hung up.

ASTERISK-25609 #close

Change-Id: Ifaa707c04b865a290ffab719bd2e5c48ff667c7b
---
M channels/chan_sip.c
1 file changed, 5 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/91/1791/1

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index b42e625..7f22beb 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -4772,6 +4772,11 @@
 	struct sip_pvt *p = (struct sip_pvt *) ast_channel_tech_pvt(chan);
 	char *cp;
 
+	if (!p) {
+		ast_debug(1, "Attempt to Ref a null pointer. Sip private structure is gone!\n");
+		return -1;
+	}
+
 	sip_pvt_lock(p);
 
 	switch (option) {

-- 
To view, visit https://gerrit.asterisk.org/1791
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Gerrit-MessageType: newchange
Gerrit-Change-Id: Ifaa707c04b865a290ffab719bd2e5c48ff667c7b
Gerrit-PatchSet: 1
Gerrit-Project: asterisk
Gerrit-Branch: 11
Gerrit-Owner: Joshua Colp <jcolp at digium.com>
Gerrit-Reviewer: Filip Jenicek <phill at janevim.cz>