[FFmpeg-devel] [PATCH 1/3] avcodec/lagarith: Check dst/src in zero run code

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 1/3] avcodec/lagarith: Check dst/src in zero run code
Date: Tue, 12 Jul 2022 20:43:20 +0200
Message-ID: <20220712184322.22814-1-michael@niedermayer.cc> (raw)

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
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/lagarith.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/lagarith.c b/libavcodec/lagarith.c
index 3aeb1c8a99..00e8005222 100644
--- a/libavcodec/lagarith.c
+++ b/libavcodec/lagarith.c
@@ -409,6 +409,9 @@ 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]);
-- 
2.17.1

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