aac: check the maximum number of channels

Broken bitstreams could report a larger than specified number of
channels and cause outbound writes.

CC:libav-stable@libav.org
(cherry picked from commit a943a132f3)

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Conflicts:
	libavcodec/aacdec.c

libavcodec/aacdec.c

@@ -183,6 +183,8 @@ static av_cold int che_configure(AACContext *ac,
                                  enum ChannelPosition che_pos[4][MAX_ELEM_ID],
                                  int type, int id, int *channels)
 {
+    if (*channels >= MAX_CHANNELS)
+        return AVERROR_INVALIDDATA;
     if (che_pos[type][id]) {
         if (!ac->che[type][id] && !(ac->che[type][id] = av_mallocz(sizeof(ChannelElement))))
             return AVERROR(ENOMEM);