[FFmpeg-devel] [PATCH 4/5] avformat/bfi: Check offsets better

[Michael Niedermayer <michael@niedermayer.cc>]

Fixes: signed integer overflow: -2145378272 - 538976288 cannot be represented in type 'int'
Fixes: 45690/clusterfuzz-testcase-minimized-ffmpeg_IO_DEMUXER_fuzzer-5015496544616448

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/bfi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libavformat/bfi.c b/libavformat/bfi.c
index a42b78b8c0..dcbe21dcae 100644
--- a/libavformat/bfi.c
+++ b/libavformat/bfi.c
@@ -139,12 +139,12 @@ static int bfi_read_packet(AVFormatContext * s, AVPacket * pkt)
         audio_offset    = avio_rl32(pb);
         avio_rl32(pb);
         video_offset    = avio_rl32(pb);
-        audio_size      = video_offset - audio_offset;
-        bfi->video_size = chunk_size - video_offset;
-        if (audio_size < 0 || bfi->video_size < 0) {
+        if (audio_offset < 0 || video_offset < audio_offset || chunk_size < video_offset) {
             av_log(s, AV_LOG_ERROR, "Invalid audio/video offsets or chunk size\n");
             return AVERROR_INVALIDDATA;
         }
+        audio_size      = video_offset - audio_offset;
+        bfi->video_size = chunk_size - video_offset;
 
         //Tossing an audio packet at the audio decoder.
         ret = av_get_packet(pb, pkt, audio_size);
-- 
2.17.1

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