res_pjsip_mwi.c: Fix null pointer crash

ASTERISK-27652 #close

Change-Id: I78a0d38bfd8d0d82830f3d53da04872d6b67284d

diff --git a/res/res_pjsip_mwi.c b/res/res_pjsip_mwi.c
index 05eee782e9f8f94e3e6d5e841d6b0ea4dca8530a..f2ddf576e261c19b381d0b1c8d46767ab6de1134 100644 (file)
--- a/res/res_pjsip_mwi.c
+++ b/res/res_pjsip_mwi.c
@@ -650,11 +650,11 @@ static void send_mwi_notify(struct mwi_subscription *sub)
                .body_type = AST_SIP_MESSAGE_ACCUMULATOR,
                .body_data = &counter,
        };
-       const char *resource = ast_sip_subscription_get_resource_name(sub->sip_sub);
 
        ao2_callback(sub->stasis_subs, OBJ_NODATA, get_message_count, &counter);
 
        if (sub->is_solicited) {
+               const char *resource = ast_sip_subscription_get_resource_name(sub->sip_sub);
                struct ast_sip_endpoint *endpoint = ast_sip_subscription_get_endpoint(sub->sip_sub);
                struct ast_sip_aor *aor = find_aor_for_resource(endpoint, resource);
                pjsip_dialog *dlg = ast_sip_subscription_get_dialog(sub->sip_sub);