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avcodec/mpegvideo: Update chroma_?_shift in ff_mpv_common_frame_size_change()

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Fixes: out of array access
Fixes: 31201/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-4627865612189696.fuzz

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
2021-03-22 15:22:35 +01:00
parent 2611d20d35
commit 87d87e6587
1 changed files with 7 additions and 0 deletions
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7
libavcodec/mpegvideo.c
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@@ -1069,6 +1069,13 @@ int ff_mpv_common_frame_size_change(MpegEncContext *s)
(err = av_image_check_size(s->width, s->height, 0, s->avctx)) < 0) (err = av_image_check_size(s->width, s->height, 0, s->avctx)) < 0)
return err; return err;
/* set chroma shifts */
err = av_pix_fmt_get_chroma_sub_sample(s->avctx->pix_fmt,
&s->chroma_x_shift,
&s->chroma_y_shift);
if (err < 0)
return err;
if ((err = init_context_frame(s))) if ((err = init_context_frame(s)))
return err; return err;