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avcodec/pixlet: fixes integer overflow in read_highpass()

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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@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-08-17 03:54:56 +02:00
parent b9f92093a1
commit cadab5a2a7
1 changed files with 3 additions and 0 deletions
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libavcodec/pixlet.c
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@ -331,6 +331,9 @@ static int read_highpass(AVCodecContext *avctx, uint8_t *ptr, int plane, AVFrame
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
} }
if (a == INT32_MIN)
return AVERROR_INVALIDDATA;
ret = read_high_coeffs(avctx, ptr + bytestream2_tell(&ctx->gb), dest, size, ret = read_high_coeffs(avctx, ptr + bytestream2_tell(&ctx->gb), dest, size,
c, (b >= FFABS(a)) ? b : a, d, c, (b >= FFABS(a)) ? b : a, d,
ctx->band[plane][i + 1].width, stride); ctx->band[plane][i + 1].width, stride);