From c1d1d30bf50fa4c09f7a0313ec58e15f9ea79199 Mon Sep 17 00:00:00 2001 From: Richard Mudgett Date: Sun, 11 Feb 2018 15:27:49 -0600 Subject: [PATCH] chan_sip.c: Fix crash processing CANCEL. Check if initreq data string exists before using it when processing a CANCEL request. ASTERISK-27666 Change-Id: Id1d0f0fa4ec94e81b332b2973d93e5a14bb4cc97 --- channels/chan_sip.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/channels/chan_sip.c b/channels/chan_sip.c index d801c6323b..a24ca81152 100644 --- a/channels/chan_sip.c +++ b/channels/chan_sip.c @@ -27264,7 +27264,7 @@ static int handle_request_cancel(struct sip_pvt *p, struct sip_request *req) } else { sip_scheddestroy(p, DEFAULT_TRANS_TIMEOUT); } - if (ast_str_strlen(p->initreq.data) > 0) { + if (p->initreq.data && ast_str_strlen(p->initreq.data) > 0) { struct sip_pkt *pkt, *prev_pkt; /* If the CANCEL we are receiving is a retransmission, and we already have scheduled * a reliable 487, then we don't want to schedule another one on top of the previous