ffmpeg | branch: master | Michael Niedermayer <michael@niedermayer.cc> | Fri Apr 23 19:33:58 2021 +0200| [b4e77dfca1c2970446f79277034d8e60c3fe3f4e] | committer: Michael Niedermayer avformat/bfi: check nframes Fixes: signed integer overflow: -2147483648 - 1 cannot be represented in type 'int' Fixes: 29102/clusterfuzz-testcase-minimized-ffmpeg_dem_BFI_fuzzer-6737028768202752 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b4e77dfca1c2970446...

libavformat/bfi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/libavformat/bfi.c b/libavformat/bfi.c index bff6f0154e..69000118fa 100644 --- a/libavformat/bfi.c +++ b/libavformat/bfi.c @@ -73,6 +73,8 @@ static int bfi_read_header(AVFormatContext * s) return AVERROR_INVALIDDATA; bfi->nframes = avio_rl32(pb); + if (bfi->nframes < 0) + return AVERROR_INVALIDDATA; avio_rl32(pb); avio_rl32(pb); avio_rl32(pb);