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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
This commit is contained in:
Richard Mudgett 2018-02-11 15:27:49 -06:00
parent 0461286123
commit 8372138cce
1 changed files with 1 additions and 1 deletions
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2
channels/chan_sip.c
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@ -27425,7 +27425,7 @@ 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