[FFmpeg-devel] [PATCH 3/4] avcodec/mobiclip: Check input size before (re)allocation

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 3/4] avcodec/mobiclip: Check input size before (re)allocation
Date: Fri, 18 Nov 2022 22:09:17 +0100
Message-ID: <20221118210918.3169-3-michael@niedermayer.cc> (raw)
In-Reply-To: <20221118210918.3169-1-michael@niedermayer.cc>

Fixes: Timeout
Fixes: 52566/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MOBICLIP_fuzzer-4913160050311168

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/mobiclip.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/mobiclip.c b/libavcodec/mobiclip.c
index aca462428c..c3b2383dbc 100644
--- a/libavcodec/mobiclip.c
+++ b/libavcodec/mobiclip.c
@@ -1216,6 +1216,9 @@ static int mobiclip_decode(AVCodecContext *avctx, AVFrame *rframe,
     AVFrame *frame = s->pic[s->current_pic];
     int ret;
 
+    if (avctx->height/16 * (avctx->width/16) * 2 > 8LL*FFALIGN(pkt->size, 2))
+        return AVERROR_INVALIDDATA;
+
     av_fast_padded_malloc(&s->bitstream, &s->bitstream_size,
                           pkt->size);
 
-- 
2.17.1

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