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avfilter/vf_ciescope: Fix undefined behavior in rgb_to_xy() with black

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Fixes: floating point division by 0
Fixes: undefined behavior in handling NaN
Fixes: Ticket 8268

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 3d500e62f6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-06-05 19:54:45 +02:00
parent f91056a25a
commit 42ae283652
1 changed files with 2 additions and 1 deletions
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libavfilter/vf_ciescope.c
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@ -849,7 +849,8 @@ rgb_to_xy(double rc,
*z = m[2][0] * rc + m[2][1] * gc + m[2][2] * bc;
sum = *x + *y + *z;
if (sum == 0)
sum = 1;
*x = *x / sum;
*y = *y / sum;
}