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PJSIP: Prevent crash on blind transfer

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Blind transfers don't go too well with NULL channels which can occur if
the channel has already been transferred away.

(closes issue ASTERISK-23718)
Reported by: Jonathan Rose
........

Merged revisions 414948 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@414949 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kinsey Moore
2014-05-30 14:53:44 +00:00
parent 53968c00b3
commit 00077c46db
1 changed files with 6 additions and 1 deletions
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7
res/res_pjsip_refer.c
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@@ -691,11 +691,16 @@ static int refer_incoming_attended_request(struct ast_sip_session *session, pjsi
static int refer_incoming_blind_request(struct ast_sip_session *session, pjsip_rx_data *rdata, pjsip_sip_uri *target, static int refer_incoming_blind_request(struct ast_sip_session *session, pjsip_rx_data *rdata, pjsip_sip_uri *target,
struct refer_progress *progress) struct refer_progress *progress)
{ {
const char *context = (session->channel ? pbx_builtin_getvar_helper(session->channel, "TRANSFER_CONTEXT") : ""); const char *context;
char exten[AST_MAX_EXTENSION]; char exten[AST_MAX_EXTENSION];
struct refer_blind refer = { 0, }; struct refer_blind refer = { 0, };
if (!session->channel) {
return 404;
}
/* If no explicit transfer context has been provided use their configured context */ /* If no explicit transfer context has been provided use their configured context */
context = pbx_builtin_getvar_helper(session->channel, "TRANSFER_CONTEXT");
if (ast_strlen_zero(context)) { if (ast_strlen_zero(context)) {
context = session->endpoint->context; context = session->endpoint->context;
} }