chan_pjsip: Prevent segfault when running PlayDTMF on hungup channel

ASTERISK-28086 #close

Change-Id: Ib3baadc89b9f0477a6f25a63861433812368c5ea

diff --git a/channels/chan_pjsip.c b/channels/chan_pjsip.c
index 9e0aa8559137437f452adf74b47854b84a61c2d4..f2f6cf8f29455cae833ce7ccdd79f574cdc62fef 100644 (file)
--- a/channels/chan_pjsip.c
+++ b/channels/chan_pjsip.c
@@ -2261,6 +2261,12 @@ static int chan_pjsip_digit_end(struct ast_channel *ast, char digit, unsigned in
        struct ast_sip_session_media *media;
        int res = 0;
 
+       if (!channel || !channel->session) {
+               /* This happens when the channel is hungup while a DTMF digit is playing. See ASTERISK-28086 */
+               ast_debug(3, "Channel %s disappeared while calling digit_end\n", ast_channel_name(ast));
+               return -1;
+       }
+
        media = channel->session->active_media_state->default_session[AST_MEDIA_TYPE_AUDIO];
 
        switch (channel->session->dtmf) {