Fixes: signed integer overflow: 9223372036854775807 + 32768 cannot be represented in type 'long' Fixes: 27744/clusterfuzz-testcase-minimized-ffmpeg_dem_DHAV_fuzzer-5179319491756032
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> --- libavformat/dhav.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libavformat/dhav.c b/libavformat/dhav.c index 53deaff77e..00e0d8476e 100644 --- a/libavformat/dhav.c +++ b/libavformat/dhav.c @@ -173,12 +173,12 @@ static int read_chunk(AVFormatContext *s) if (avio_feof(s->pb)) return AVERROR_EOF; - if (avio_rl32(s->pb) != MKTAG('D','H','A','V')) { + if (avio_rl32(s->pb) != MKTAG('D','H','A','V') && dhav->last_good_pos < INT64_MAX - 0x8000) { dhav->last_good_pos += 0x8000; avio_seek(s->pb, dhav->last_good_pos, SEEK_SET); while (avio_rl32(s->pb) != MKTAG('D','H','A','V')) { - if (avio_feof(s->pb)) + if (avio_feof(s->pb) || dhav->last_good_pos >= INT64_MAX - 0x8000) return AVERROR_EOF; dhav->last_good_pos += 0x8000; ret = avio_skip(s->pb, 0x8000 - 4); -- 2.17.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
