channels: Don't dereference NULL pointer

Check result of ast_translator_build_path against NULL before dereferencing.

ASTERISK-29091

Change-Id: Ia3538ea190bd371f70c9dd49984b021765691b29

diff --git a/main/channel.c b/main/channel.c
index 276c1bc5c02a64b8d8dfffac28d4842286b02002..d75c615583a369c08692c3793176933b82b2a10d 100644 (file)
--- a/main/channel.c
+++ b/main/channel.c
@@ -5709,11 +5709,15 @@ static int set_format(struct ast_channel *chan, struct ast_format_cap *cap_set,
                if (!direction) {
                        /* reading */
                        trans_pvt = ast_translator_build_path(best_set_fmt, best_native_fmt);
-                       trans_pvt->interleaved_stereo = 0;
+                       if (trans_pvt) {
+                               trans_pvt->interleaved_stereo = 0;
+                       }
                } else {
                        /* writing */
                        trans_pvt = ast_translator_build_path(best_native_fmt, best_set_fmt);
-                       trans_pvt->interleaved_stereo = interleaved_stereo;
+                       if (trans_pvt) {
+                               trans_pvt->interleaved_stereo = interleaved_stereo;
+                       }
                }
                access->set_trans(chan, trans_pvt);
                res = trans_pvt ? 0 : -1;