[FFmpeg-cvslog] avcodec/pixlet: fixes integer overflow in read_highpass()
Michael Niedermayer
git at videolan.org
Fri Aug 18 13:41:34 EEST 2017
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Aug 17 03:54:56 2017 +0200| [cadab5a2a74d715fc16325bd89f8b8091def1083] | committer: Michael Niedermayer
avcodec/pixlet: fixes integer overflow in read_highpass()
Fixes: runtime error: negation of -2147483648 cannot be represented in type 'int32_t' (aka 'int'); cast to an unsigned type to negate this value to itself
Fixes: 2879/clusterfuzz-testcase-minimized-6317542639403008
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=cadab5a2a74d715fc16325bd89f8b8091def1083
---
libavcodec/pixlet.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavcodec/pixlet.c b/libavcodec/pixlet.c
index a9661d3ab6..088226bdda 100644
--- a/libavcodec/pixlet.c
+++ b/libavcodec/pixlet.c
@@ -331,6 +331,9 @@ static int read_highpass(AVCodecContext *avctx, uint8_t *ptr, int plane, AVFrame
return AVERROR_INVALIDDATA;
}
+ if (a == INT32_MIN)
+ return AVERROR_INVALIDDATA;
+
ret = read_high_coeffs(avctx, ptr + bytestream2_tell(&ctx->gb), dest, size,
c, (b >= FFABS(a)) ? b : a, d,
ctx->band[plane][i + 1].width, stride);
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