vc1dec: fix invalid memory access for small video dimensions

For small video dimensions, these calculations of the upper bound
for pixel access may have a negative result. Using an unsigned
comparison to bound a potentially negative value only works if
the greater operand is non-negative. Fixed by doing edge emulation
when the upper bound is probably negative, everywhere that this
pattern appears.

Signed-off-by: Kostya Shishkov <[email protected]>
(cherry picked from commit d209c27b09234cc40bbdbd680aa502b493edf595)

Signed-off-by: Michael Niedermayer <[email protected]>

0 files changed, 0 insertions, 0 deletions