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 <mich...@niedermayer.cc>
---
 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);
 
-- 
2.16.2

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