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[FFmpeg-devel,3/4] avcodec/jpeg2000dec: Replace the step_x/y assert by a check in the CPRL case as with the PCRL case

Message ID 20190416144834.20300-3-michael@niedermayer.cc
State Accepted
Commit 6381b6f6a9736f9bae92618c3d43c50b21810146
Headers show

Commit Message

Michael Niedermayer April 16, 2019, 2:48 p.m. UTC 
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@niedermayer.cc>
---
 libavcodec/jpeg2000dec.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

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;