[FFmpeg-cvslog] avcodec/jpeg2000dec: Fix off by 1 error in JPEG2000_PGOD_CPRL handling

[Michael Niedermayer]

ffmpeg | branch: release/3.4 | Michael Niedermayer <michael at niedermayer.cc> | Sat Oct 20 22:35:37 2018 +0200| [1bcc79db44ed0089c6dd7b2ce3ed99234bfa73db] | committer: Michael Niedermayer

avcodec/jpeg2000dec: Fix off by 1 error in JPEG2000_PGOD_CPRL handling

Fixes: assertion failure
Fixes: 10785/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-5672160496975872

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 305e523105f6f59e7572050f19edc9f4671c036c)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1bcc79db44ed0089c6dd7b2ce3ed99234bfa73db
---

 libavcodec/jpeg2000dec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index 5cba177513..3edcb81094 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -1130,7 +1130,7 @@ static int jpeg2000_decode_packets_po_iteration(Jpeg2000DecoderContext *s, Jpeg2
             step_x = 32;
             step_y = 32;
 
-            if (RSpoc > FFMIN(codsty->nreslevels, REpoc))
+            if (RSpoc >= FFMIN(codsty->nreslevels, REpoc))
                 continue;
 
             for (reslevelno = RSpoc; reslevelno < FFMIN(codsty->nreslevels, REpoc); reslevelno++) {