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avcodec/jpeg2000dec: Skip init for component in CPRL if nothing is to be done

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Fixes: assertion failure
Fixes: 7949/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-4819602782552064

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit a96c131eb5)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-05-04 19:11:36 +02:00
parent 02f4e846d2
commit 4e9e1ab815
1 changed files with 3 additions and 0 deletions
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libavcodec/jpeg2000dec.c
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@ -1124,6 +1124,9 @@ static int jpeg2000_decode_packets_po_iteration(Jpeg2000DecoderContext *s, Jpeg2
step_x = 32;
step_y = 32;
if (RSpoc > FFMIN(codsty->nreslevels, REpoc))
continue;
for (reslevelno = RSpoc; reslevelno < FFMIN(codsty->nreslevels, REpoc); reslevelno++) {
uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; // ==> N_L - r
Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;