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avcodec/error_resilience: Fix integer overflow in filter181()

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Fixes: runtime error: signed integer overflow: 197710 * 10923 cannot be represented in type 'int'
Fixes: 7010/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-5667127596941312

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-04-22 21:46:05 +02:00
parent de841fbea7
commit 1c97035e3b
1 changed files with 2 additions and 2 deletions
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4
libavcodec/error_resilience.c
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@ -107,7 +107,7 @@ static void filter181(int16_t *data, int width, int height, ptrdiff_t stride)
dc = -prev_dc +
data[x + y * stride] * 8 -
data[x + 1 + y * stride];
dc = (dc * 10923 + 32768) >> 16;
dc = (av_clip(dc, INT_MIN/10923, INT_MAX/10923 - 32768) * 10923 + 32768) >> 16;
prev_dc = data[x + y * stride];
data[x + y * stride] = dc;
}
@ -123,7 +123,7 @@ static void filter181(int16_t *data, int width, int height, ptrdiff_t stride)
dc = -prev_dc +
data[x + y * stride] * 8 -
data[x + (y + 1) * stride];
dc = (dc * 10923 + 32768) >> 16;
dc = (av_clip(dc, INT_MIN/10923, INT_MAX/10923 - 32768) * 10923 + 32768) >> 16;
prev_dc = data[x + y * stride];
data[x + y * stride] = dc;
}