Niklas Haas b7946098b1 swscale/alphablend: don't overread alpha plane on subsampled odd size ...

This function overreads the input plane for odd dimensions, because the
chroma plane is always rounded up, which means (xy << subsample) + 1 exceeds
the actual alpha plane size.

To verify:
  valgrind ffmpeg -pix_fmt yuva420p -f lavfi -i color -vf \
  "scale=1x1,format=yuva420p,scale=alphablend=uniform_color,format=yuv420p \
  -vframes 1 -f null -

Fixes: https://trac.ffmpeg.org/ticket/11692

2025-07-31 11:32:20 +00:00

9.6 KiB

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