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avcodec/jpeg2000dec: Check precno before using it in JPEG2000_PGOD_CPRL 

Fixes out of array reads
Fixes: asan_heap-oob_f0de57_6823_mjp2.mov

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-11-24 03:50:20 +01:00
parent 638d79a9d0
commit 3d5a5e86be
1 changed files with 4 additions and 0 deletions
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4
libavcodec/jpeg2000dec.c
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@ -889,6 +889,10 @@ static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile
prcx = ff_jpeg2000_ceildivpow2(x, reducedresno) >> rlevel->log2_prec_width;
prcy = ff_jpeg2000_ceildivpow2(y, reducedresno) >> rlevel->log2_prec_height;
precno = prcx + rlevel->num_precincts_x * prcy;
if (prcx >= rlevel->num_precincts_x || prcy >= rlevel->num_precincts_y)
return AVERROR_PATCHWELCOME;
for (layno = 0; layno < tile->codsty[0].nlayers; layno++) {
if ((ret = jpeg2000_decode_packet(s, codsty, rlevel,
precno, layno,