[FFmpeg-cvslog] avcodec/exr: Check oe in huf_decode() before use
Michael Niedermayer
git at videolan.org
Thu Apr 1 12:50:09 EEST 2021
ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Tue Mar 30 09:15:27 2021 +0200| [698d768d216f5a5d598b4cfb6f347b7c0d61d1c8] | committer: Michael Niedermayer
avcodec/exr: Check oe in huf_decode() before use
Fixes: out of array access
Fixes: 31386/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EXR_fuzzer-5773234709594112
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 9e8475c7c7a81e8299e88d89981df3c14657fff4)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=698d768d216f5a5d598b4cfb6f347b7c0d61d1c8
---
libavcodec/exr.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/libavcodec/exr.c b/libavcodec/exr.c
index 279cfe9412..65e5203c31 100644
--- a/libavcodec/exr.c
+++ b/libavcodec/exr.c
@@ -422,7 +422,12 @@ static int huf_decode(VLC *vlc, GetByteContext *gb, int nbits, int run_sym,
if (x == run_sym) {
int run = get_bits(&gbit, 8);
- uint16_t fill = out[oe - 1];
+ uint16_t fill;
+
+ if (oe == 0 || oe + run > no)
+ return AVERROR_INVALIDDATA;
+
+ fill = out[oe - 1];
while (run-- > 0)
out[oe++] = fill;
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