[FFmpeg-devel] [PATCH 3/4] avcodec/jpeg2000dec: Replace the step_x/y assert by a check in the CPRL case as with the PCRL case
Michael Niedermayer
michael at niedermayer.cc
Tue Apr 16 17:48:33 EEST 2019
Fixes: assertion failure
Fixes: 14246/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-5758393601490944
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
libavcodec/jpeg2000dec.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index 7749c980e5..9198cf87cb 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -1171,7 +1171,10 @@ static int jpeg2000_decode_packets_po_iteration(Jpeg2000DecoderContext *s, Jpeg2
step_x = FFMIN(step_x, rlevel->log2_prec_width + reducedresno);
step_y = FFMIN(step_y, rlevel->log2_prec_height + reducedresno);
}
- av_assert0(step_x < 32 && step_y < 32);
+ if (step_x >= 31 || step_y >= 31){
+ avpriv_request_sample(s->avctx, "CPRL with large step");
+ return AVERROR_PATCHWELCOME;
+ }
step_x = 1<<step_x;
step_y = 1<<step_y;
--
2.21.0
More information about the ffmpeg-devel
mailing list