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Code Issues Releases Activity

avcodec/vc1: Fix undefined shifts

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Found-by: Clang -fsanitize=shift
Reported-by: Thierry Foucu <tfoucu@google.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-03-15 02:57:24 +01:00
parent b8535b273f
commit 3b63819dfb
1 changed files with 2 additions and 2 deletions
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4
libavcodec/vc1.c
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@ -572,13 +572,13 @@ int ff_vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContex
int scale, shift, i; \ int scale, shift, i; \
if (!lumscale) { \ if (!lumscale) { \
scale = -64; \ scale = -64; \
shift = (255 - lumshift * 2) << 6; \ shift = (255 - lumshift * 2) * 64; \
if (lumshift > 31) \ if (lumshift > 31) \
shift += 128 << 6; \ shift += 128 << 6; \
} else { \ } else { \
scale = lumscale + 32; \ scale = lumscale + 32; \
if (lumshift > 31) \ if (lumshift > 31) \
shift = (lumshift - 64) << 6; \ shift = (lumshift - 64) * 64; \
else \ else \
shift = lumshift << 6; \ shift = lumshift << 6; \
} \ } \