avcodec/utils: Align dimensions by at least their chroma sub-sampling factors.
Fixes: out of array accesses Fixes: asan_heap-oob_112c6b3_13_012.avi Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by:Michael Niedermayer <michaelni@gmx.at> (cherry picked from commit df74811c) Signed-off-by:
Michael Niedermayer <michaelni@gmx.at>
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