manager: Tolerate stasis messages with no channel snapshot.

In some cases I have yet to determine some stasis messages may
be created without a channel snapshot. This change adds some
tolerance to this scenario, preventing a crash from occurring.

(cherry picked from commit 9b607747ce3064a0229bcfcd45721c5e95784f95)

diff --git a/main/manager_channels.c b/main/manager_channels.c
index 8af3465a29644d6c0096aa9b9f98acd0fb0f11a4..344a2487a77c75415688cd9718bf55bf9417a51b 100644 (file)
--- a/main/manager_channels.c
+++ b/main/manager_channels.c
@@ -493,7 +493,7 @@ struct ast_str *ast_manager_build_channel_state_string_prefix(
        char *connected_name;
        int res;
 
-       if (snapshot->base->tech_properties & AST_CHAN_TP_INTERNAL) {
+       if (!snapshot || (snapshot->base->tech_properties & AST_CHAN_TP_INTERNAL)) {
                return NULL;
        }