[FFmpeg-cvslog] avformat/mov: sanity check STSD entries

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Feb  6 21:54:31 2021 +0100| [cb90e1c4d03414b9abc765ab0b91d87a9278fb73] | committer: Michael Niedermayer

avformat/mov: sanity check STSD entries

The choosen value is arbitrary. I am not sure if this is a good idea
but i dont immedeately see an alternative better way, it seems either
an arbitrary limit or OOM

Fixes: OOM
Fixes: 27492/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6194970578649088

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=cb90e1c4d03414b9abc765ab0b91d87a9278fb73
---

 libavformat/mov.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 2fd1f2cd8f..9ca0a3ee15 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2605,7 +2605,7 @@ static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     entries = avio_rb32(pb);
 
     /* Each entry contains a size (4 bytes) and format (4 bytes). */
-    if (entries <= 0 || entries > atom.size / 8) {
+    if (entries <= 0 || entries > atom.size / 8 || entries > 1024) {
         av_log(c->fc, AV_LOG_ERROR, "invalid STSD entries %d\n", entries);
         return AVERROR_INVALIDDATA;
     }