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avcodec/jpeg2000dec: Check reslevelno in RPCL

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Fixes out of array read
Fixes Ticket4627

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-06-15 03:00:53 +02:00
parent a58f1bcc4c
commit 5b0f55aab9
1 changed files with 3 additions and 0 deletions
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libavcodec/jpeg2000dec.c
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@ -1102,6 +1102,9 @@ static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile
int xc = x / s->cdx[compno];
int yc = y / s->cdy[compno];
if (reslevelno >= codsty->nreslevels)
continue;
if (yc % (1 << (rlevel->log2_prec_height + reducedresno)))
continue;