avformat/dhav: Break out of infinite dhav search loop

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@niedermayer.cc>

diff --git a/libavformat/dhav.c b/libavformat/dhav.c
index 6a6c235e655fff9c5474049637c783e10184aaa6..526331ae4cc1931cc3d975c7eecfa4855c3211f8 100644 (file)
--- a/libavformat/dhav.c
+++ b/libavformat/dhav.c
@@ -281,6 +281,8 @@ 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);
             }