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res_pjsip_exten_state: PJSIPShowSubscriptionsInbound causes crash

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Currently, it is possible for some subscriptions to get into a NULL state. When
this occurs and the PJSIPShowSubscriptionsInbound ami action is issued and a
device is subscribed for extension state then the associated subscription state
object can't be located.  The code then attempts to dereference a NULL object.
Added a NULL check to avoid the problem.

Reported by: John Bigelow
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Merged revisions 426779 from http://svn.asterisk.org/svn/asterisk/branches/12
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Merged revisions 426780 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@426781 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kevin Harwell
2014-10-30 21:14:01 +00:00
parent cd52456ea1
commit a537e314d1
1 changed files with 4 additions and 0 deletions
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4
res/res_pjsip_exten_state.c
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@@ -457,6 +457,10 @@ static void to_ami(struct ast_sip_subscription *sub,
struct exten_state_subscription *exten_state_sub = struct exten_state_subscription *exten_state_sub =
get_exten_state_sub(sub); get_exten_state_sub(sub);
if (!exten_state_sub) {
return;
}
ast_str_append(buf, 0, "SubscriptionType: extension_state\r\n" ast_str_append(buf, 0, "SubscriptionType: extension_state\r\n"
"Extension: %s\r\nExtensionStates: %s\r\n", "Extension: %s\r\nExtensionStates: %s\r\n",
exten_state_sub->exten, ast_extension_state2str( exten_state_sub->exten, ast_extension_state2str(