[FFmpeg-devel] [PATCH] avformat/mov: check offset for overflow in mov_probe()

[Michael Niedermayer]

Fixes: Invalid read of size 4
Fixes: ASAN_Deadlysignal.zip

Found-by: Hardik Shah <hardik05 at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavformat/mov.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 7805330bf9..ef73f3199d 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -7161,6 +7161,8 @@ static int mov_probe(const AVProbeData *p)
             score  = FFMAX(score, AVPROBE_SCORE_EXTENSION);
             break;
         }
+        if ((uint64_t)size + 8 > INT64_MAX - offset)
+            break;
         offset += size;
     }
     if (score > AVPROBE_SCORE_MAX - 50 && moov_offset != -1) {
-- 
2.17.1