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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-17 01:12:55 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-17 01:13:46 +0200 |
| commit | 355e27e24dc88d6ba8f27501a34925d9d937a399 (patch) | |
| tree | b9623e82ee1d72b4943a343b4ae788c38f118990 | |
| parent | 552adf1dd3a38fb7a1a6109dd2b517d63290f20e (diff) | |
| download | ffmpeg-355e27e24dc88d6ba8f27501a34925d9d937a399.tar.gz | |
avcodec/flicvideo: Check frame_size before decrementing
Fixes: runtime error: signed integer overflow: -2147483627 - 22 cannot be represented in type 'int'
Fixes: 1637/clusterfuzz-testcase-minimized-5376582493405184
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/flicvideo.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/libavcodec/flicvideo.c b/libavcodec/flicvideo.c index 7f9b871dc7..ccc6cb25b3 100644 --- a/libavcodec/flicvideo.c +++ b/libavcodec/flicvideo.c @@ -199,6 +199,9 @@ static int flic_decode_frame_8BPP(AVCodecContext *avctx, num_chunks = bytestream2_get_le16(&g2); bytestream2_skip(&g2, 8); /* skip padding */ + if (frame_size < 16) + return AVERROR_INVALIDDATA; + frame_size -= 16; /* iterate through the chunks */ @@ -523,6 +526,8 @@ static int flic_decode_frame_15_16BPP(AVCodecContext *avctx, if (frame_size > buf_size) frame_size = buf_size; + if (frame_size < 16) + return AVERROR_INVALIDDATA; frame_size -= 16; /* iterate through the chunks */ @@ -815,6 +820,8 @@ static int flic_decode_frame_24BPP(AVCodecContext *avctx, if (frame_size > buf_size) frame_size = buf_size; + if (frame_size < 16) + return AVERROR_INVALIDDATA; frame_size -= 16; /* iterate through the chunks */ |