[FFmpeg-devel] [PATCH 4/7] avformat/dhav: Break out of infinite dhav search loop

[Michael Niedermayer]

Fixes: Infinite loop
Fixes: 26922/clusterfuzz-testcase-minimized-ffmpeg_dem_DHAV_fuzzer-5794549613723648

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavformat/dhav.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/dhav.c b/libavformat/dhav.c
index 53deaff77e..6989b9bc01 100644
--- a/libavformat/dhav.c
+++ b/libavformat/dhav.c
@@ -290,6 +290,8 @@ static int dhav_read_header(AVFormatContext *s)
                 int seek_back;
 
                 seek_back = avio_rl32(s->pb) + 8;
+                if (seek_back < 9)
+                    break;
                 dhav->last_good_pos = avio_tell(s->pb);
                 avio_seek(s->pb, -seek_back, SEEK_CUR);
             }
-- 
2.17.1