[FFmpeg-cvslog] avcodec/lagarith: Check dst/src in zero run code
Michael Niedermayer
git at videolan.org
Wed Oct 12 15:46:18 EEST 2022
ffmpeg | branch: release/3.4 | Michael Niedermayer <michael at niedermayer.cc> | Tue Jul 12 20:43:20 2022 +0200| [26be0c6c7aa98f2c5dc909891b5ea42f58924cc0] | committer: Michael Niedermayer
avcodec/lagarith: Check dst/src in zero run code
Fixes: out of array access
Fixes: 48799/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LAGARITH_fuzzer-4764457825337344
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 9450f759748d02d1d284d2e4afd741cb0fe0c04a)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=26be0c6c7aa98f2c5dc909891b5ea42f58924cc0
---
libavcodec/lagarith.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavcodec/lagarith.c b/libavcodec/lagarith.c
index ff3eded761..6e5d754dfb 100644
--- a/libavcodec/lagarith.c
+++ b/libavcodec/lagarith.c
@@ -404,6 +404,9 @@ output_zeros:
if (zero_run) {
zero_run = 0;
i += esc_count;
+ if (i > end - dst ||
+ i >= src_end - src)
+ return AVERROR_INVALIDDATA;
memcpy(dst, src, i);
dst += i;
l->zeros_rem = lag_calc_zero_run(src[i]);
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