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@niedermayer.cc>

diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index 96dab8e1766c1675a89782c48c54418efc96e807..5b07f07aa9a2ada4e9500b9f8ad1d820a93b650f 100644 (file)
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -1162,7 +1162,7 @@ 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++) {