[FFmpeg-devel] [PATCH 3/4] avcodec/mvha: Clear remaining space after inflate()

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 3/4] avcodec/mvha: Clear remaining space after inflate()
Date: Sun,  4 Aug 2024 16:23:14 +0200
Message-ID: <20240804142315.1430389-3-michael@niedermayer.cc> (raw)
In-Reply-To: <20240804142315.1430389-1-michael@niedermayer.cc>

Fixes: use-of-uninitialized-value
Fixes: 70838/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MVHA_fuzzer-4878509466517504

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/mvha.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/mvha.c b/libavcodec/mvha.c
index 24dd88e8542..4aad56640ee 100644
--- a/libavcodec/mvha.c
+++ b/libavcodec/mvha.c
@@ -183,6 +183,8 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
                     av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret);
                     return AVERROR_EXTERNAL;
                 }
+                if (zstream->avail_out > 0)
+                    memset(zstream->next_out, 0, zstream->avail_out);
             }
         }
     } else if (type == MKTAG('H','U','F','Y')) {
-- 
2.45.2

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