avformat/mov: Check size of STSC allocation

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit a6fdd75fe6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/mov.c

@@ -2411,6 +2411,8 @@ static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     avio_rb24(pb); /* flags */
 
     entries = avio_rb32(pb);
+    if ((uint64_t)entries * 12 + 4 > atom.size)
+        return AVERROR_INVALIDDATA;
 
     av_log(c->fc, AV_LOG_TRACE, "track[%u].stsc.entries = %u\n", c->fc->nb_streams - 1, entries);