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avfilter/vf_scale: Fix adding 0 to NULL (which is UB) in scale_slice() 

Found-by: Jeremy Leconte <jleconte@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 1cf96ce269)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-02-19 21:43:45 +01:00
parent 135b6f1e2c
commit 1ac57ed112
1 changed files with 2 additions and 2 deletions
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4
libavfilter/vf_scale.c
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@ -635,8 +635,8 @@ static int scale_slice(AVFilterLink *link, AVFrame *out_buf, AVFrame *cur_pic, s
int vsub= ((i+1)&2) ? scale->vsub : 0;
in_stride[i] = cur_pic->linesize[i] * mul;
out_stride[i] = out_buf->linesize[i] * mul;
in[i] = cur_pic->data[i] + ((y>>vsub)+field) * cur_pic->linesize[i];
out[i] = out_buf->data[i] + field * out_buf->linesize[i];
in[i] = FF_PTR_ADD(cur_pic->data[i], ((y>>vsub)+field) * cur_pic->linesize[i]);
out[i] = FF_PTR_ADD(out_buf->data[i], field * out_buf->linesize[i]);
}
if (scale->input_is_pal)
in[1] = cur_pic->data[1];