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libavcodec/jpeg2000dec: Fix codeblock decode check

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The codeblock decoder checks whether the mqc decoder
has decoded the right number of bytes. However, this
check does not account for the fact that the mqc encoder's
flush routine adds 2 bytes of data which does not have to be
read by the decoder. The check is modified to account for
this. This patch solves issue #4827

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Gautam Ramakrishnan 2020-07-23 22:41:10 +05:30 committed by Michael Niedermayer
parent 4333718b35
commit ff5b9ece42
1 changed files with 6 additions and 2 deletions
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8
libavcodec/jpeg2000dec.c
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@ -1754,9 +1754,13 @@ static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty,
pass_cnt ++;
}
if (cblk->data + cblk->length - 2*(term_cnt < cblk->nb_terminations) != t1->mqc.bp) {
if (cblk->data + cblk->length - 2 > t1->mqc.bp) {
av_log(s->avctx, AV_LOG_WARNING, "End mismatch %"PTRDIFF_SPECIFIER"\n",
cblk->data + cblk->length - 2*(term_cnt < cblk->nb_terminations) - t1->mqc.bp);
cblk->data + cblk->length - 2 - t1->mqc.bp);
}
if (cblk->data + cblk->length < t1->mqc.bp) {
av_log(s->avctx, AV_LOG_WARNING, "Synthetic End of Stream Marker Read.\n");
}
return 1;