[FFmpeg-devel] [PATCH] mpeg4videodec: silence ubsan warning

Michael Niedermayer michael at niedermayer.cc
Fri Jan 15 03:17:24 CET 2016

On Fri, Jan 15, 2016 at 12:30:28AM +0100, Andreas Cadhalpun wrote:
> s->ac_val[0][0] is of type 'int16_t [16]', but points into a larger buffer.
> Here it is used as base pointer to find the correct position in the
> larger buffer by adding 's->block_index[n] * 16' and thus as 'int16_t *'.
> This fixes clang's ubsan runtime error: index out of bounds for type
> 'int16_t [16]'
> Fixes: test_case.mp4
> Found-by: Tyson Smith <twsmith at mozilla.com>
> Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Republics decline into democracies and democracies degenerate into
despotisms. -- Aristotle
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