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avcodec/snowenc: sign extend a variable before shifting

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Fixes "libavcodec/snowenc.c:718:27: runtime error: left shift of 8509032 by 8 places cannot be represented in type 'int'"
as seen in fate-vsynth2-snow-hpel under ubsan.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2024-08-13 22:07:17 -03:00
parent 7ad937f0c8
commit 9880fea930
1 changed files with 1 additions and 1 deletions
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2
libavcodec/snowenc.c
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@@ -715,7 +715,7 @@ static int get_dc(SnowEncContext *enc, int mb_x, int mb_y, int plane_index)
}
*b= backup;
return av_clip_uint8( ROUNDED_DIV(ab<<LOG2_OBMC_MAX, aa) ); //FIXME we should not need clipping
return av_clip_uint8( ROUNDED_DIV((int64_t)ab<<LOG2_OBMC_MAX, aa) ); //FIXME we should not need clipping
}
static inline int get_block_bits(SnowContext *s, int x, int y, int w){