[FFmpeg-cvslog] avcodec/smc: Check input packet size
Michael Niedermayer
git at videolan.org
Sat Feb 24 05:51:20 EET 2018
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Feb 23 03:40:02 2018 +0100| [0293663483ab5dbfff23602a62800d84e021b33c] | committer: Michael Niedermayer
avcodec/smc: Check input packet size
Fixes: Timeout
Fixes: 6261/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SMC_fuzzer-5811309653262336
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0293663483ab5dbfff23602a62800d84e021b33c
---
libavcodec/smc.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libavcodec/smc.c b/libavcodec/smc.c
index 79f9a757a0..3cb4834737 100644
--- a/libavcodec/smc.c
+++ b/libavcodec/smc.c
@@ -438,6 +438,10 @@ static int smc_decode_frame(AVCodecContext *avctx,
int pal_size;
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &pal_size);
int ret;
+ int total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
+
+ if (total_blocks / 1024 > avpkt->size)
+ return AVERROR_INVALIDDATA;
bytestream2_init(&s->gb, buf, buf_size);
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