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swscale/output: Fix integer overflow in yuv2rgb_write_full() with out of range input 

Fixes: signed integer overflow: 1169365504 + 981452800 cannot be represented in type 'int'
Fixes: ticket8293

Found-by: Suhwan
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-02-16 20:11:52 +01:00
parent 49ba1879ad
commit e057e83a4f
1 changed files with 3 additions and 3 deletions
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6
libswscale/output.c
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@ -1850,9 +1850,9 @@ static av_always_inline void yuv2rgb_write_full(SwsContext *c,
Y -= c->yuv2rgb_y_offset;
Y *= c->yuv2rgb_y_coeff;
Y += 1 << 21;
R = Y + V*c->yuv2rgb_v2r_coeff;
G = Y + V*c->yuv2rgb_v2g_coeff + U*c->yuv2rgb_u2g_coeff;
B = Y + U*c->yuv2rgb_u2b_coeff;
R = (unsigned)Y + V*c->yuv2rgb_v2r_coeff;
G = (unsigned)Y + V*c->yuv2rgb_v2g_coeff + U*c->yuv2rgb_u2g_coeff;
B = (unsigned)Y + U*c->yuv2rgb_u2b_coeff;
if ((R | G | B) & 0xC0000000) {
R = av_clip_uintp2(R, 30);
G = av_clip_uintp2(G, 30);