mov: Make sure the read sample count is nonnegative

This avoids setting a negative number of frames, ending up with a
negative average frame rate.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>

diff --git a/libavformat/mov.c b/libavformat/mov.c
index c3d857be4d813384b53081d72b3d27dcefdc5322..e1f2db28d9edbe0adcae1f583ade3a9675e396c9 100644 (file)
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -1724,6 +1724,10 @@ static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 
         sample_count=avio_rb32(pb);
         sample_duration = avio_rb32(pb);
+        if (sample_count < 0) {
+            av_log(c->fc, AV_LOG_ERROR, "Invalid sample_count=%d\n", sample_count);
+            return AVERROR_INVALIDDATA;
+        }
         sc->stts_data[i].count= sample_count;
         sc->stts_data[i].duration= sample_duration;