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chan_sip: Check sip_pvt pointer in ast_channel_get_t38_state(c)

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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
This commit is contained in:
Filip Jenicek
2015-12-08 08:57:22 +01:00
committed by Richard Mudgett
parent 65c8147952
commit 59a91c350a
1 changed files with 5 additions and 0 deletions
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5
channels/chan_sip.c
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@@ -4757,6 +4757,11 @@ static int sip_queryoption(struct ast_channel *chan, int option, void *data, int
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) {