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avcodec/h264_slice: Check sps in h264_slice_header_init()

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Fixes: null pointer dereference
Fixes: h264_slice_header_init.mp4

Found-by: Rafael Dutra <rafael.dutra@cispa.de>
Tested-by: Rafael Dutra <rafael.dutra@cispa.de>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-03-20 17:02:36 +01:00
parent 28859d6e7c
commit 8047243899
1 changed files with 5 additions and 0 deletions
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5
libavcodec/h264_slice.c
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@ -922,6 +922,11 @@ static int h264_slice_header_init(H264Context *h)
const SPS *sps = h->ps.sps;
int i, ret;
if (!sps) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
ff_set_sar(h->avctx, sps->sar);
av_pix_fmt_get_chroma_sub_sample(h->avctx->pix_fmt,
&h->chroma_x_shift, &h->chroma_y_shift);