apng: use correct size for output buffer

The buffer needs s->bpp bytes, at maximum currently 10.
Assert that s->bpp is not larger.

This fixes a stack buffer overflow.

Reviewed-by: wm4 <nfxjfg@googlemail.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
(cherry picked from commit 3e8e1a660ea182111057d56ec1cfad2c62250f4c)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

0 files changed, 0 insertions, 0 deletions