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avcodec/pngdec: Fix runtime error: left shift of 152 by 24 places cannot be represented in type 'int'

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Fixes: 666/clusterfuzz-testcase-6581447227867136

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 310d2af319d9113263f75e94f5a1b211c05260b5)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-02-25 01:43:16 +01:00
parent e28c0d4888
commit f7e3422a8f
1 changed files with 1 additions and 1 deletions
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libavcodec/pngdec.c
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@ -794,7 +794,7 @@ static int decode_trns_chunk(AVCodecContext *avctx, PNGDecContext *s,
return AVERROR_INVALIDDATA;
for (i = 0; i < length; i++) {
v = bytestream2_get_byte(&s->gb);
unsigned v = bytestream2_get_byte(&s->gb);
s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
}
} else if (s->color_type == PNG_COLOR_TYPE_GRAY || s->color_type == PNG_COLOR_TYPE_RGB) {