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avcodec/smc: Check input packet size

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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@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-02-23 03:40:02 +01:00
parent b141902872
commit 0293663483
1 changed files with 4 additions and 0 deletions
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4
libavcodec/smc.c
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@ -438,6 +438,10 @@ static int smc_decode_frame(AVCodecContext *avctx,
int pal_size; int pal_size;
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &pal_size); const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &pal_size);
int ret; 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); bytestream2_init(&s->gb, buf, buf_size);