[FFmpeg-cvslog] avcodec/dpx: Check bits_per_color earlier

Michael Niedermayer git at videolan.org
Sat Apr 17 20:09:32 EEST 2021


ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Apr 11 21:04:12 2021 +0200| [c093eb30311b7148a4da1c7555498187c8cdf0db] | committer: Michael Niedermayer

avcodec/dpx: Check bits_per_color earlier

Fixes: shift exponent 251 is too large for 32-bit type 'int'
Fixes: 32147/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DPX_fuzzer-5519111675314176

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c093eb30311b7148a4da1c7555498187c8cdf0db
---

 libavcodec/dpx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/dpx.c b/libavcodec/dpx.c
index 5372e3d586..b02996f04c 100644
--- a/libavcodec/dpx.c
+++ b/libavcodec/dpx.c
@@ -242,6 +242,9 @@ static int decode_frame(AVCodecContext *avctx,
         return AVERROR_PATCHWELCOME;
     }
 
+    if (bits_per_color > 32)
+        return AVERROR_INVALIDDATA;
+
     buf += 820;
     avctx->sample_aspect_ratio.num = read32(&buf, endian);
     avctx->sample_aspect_ratio.den = read32(&buf, endian);



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