FFmpeg 4.2.1 vf_convolution.c filter_prewitt integer overflow

A vulnerability was found in FFmpeg 4.2.1 (Multimedia Processing Software). It has been rated as critical. This issue affects the function filter_prewitt of the file libavfilter/vf_convolution.c. Applying the patch 99f8d32129dd233d4eb2efa44678a0bc44869f23 is able to eliminate this problem. The bugfix is ready for download at git.ffmpeg.org.

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