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avfilter/bwdif: account for chroma sub-sampling in min size calculation

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The current logic for detecting frames that are too small for the
algorithm does not account for chroma sub-sampling, and so a sample
where the luma plane is large enough, but the chroma planes are not
will not be rejected. In that event, a heap overflow will occur.

This change adjusts the logic to consider the chroma planes and makes
the change to all three bwdif implementations.

Fixes #10688

Signed-off-by: Cosmin Stejerean <cosmin@cosmin.at>
Reviewed-by: Thomas Mundt <tmundt75@gmail.com>
Signed-off-by: Philip Langdale <philipl@overt.org>
(cherry picked from commit 737ede405b)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Cosmin Stejerean 2023-12-06 18:39:32 +08:00 • committed by Michael Niedermayer
parent dae907d551
commit e6ef90db6c
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1 changed files with 4 additions and 3 deletions
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7
libavfilter/vf_bwdif.c
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@ -505,12 +505,13 @@ static int config_props(AVFilterLink *link)
if(s->mode&1)
link->frame_rate = av_mul_q(link->src->inputs[0]->frame_rate, (AVRational){2,1});
if (link->w < 3 || link->h < 4) {
av_log(ctx, AV_LOG_ERROR, "Video of less than 3 columns or 4 lines is not supported\n");
s->csp = av_pix_fmt_desc_get(link->format);
if (AV_CEIL_RSHIFT(link->w, s->csp->log2_chroma_w) < 3 || AV_CEIL_RSHIFT(link->h, s->csp->log2_chroma_h) < 4) {
av_log(ctx, AV_LOG_ERROR, "Video with planes less than 3 columns or 4 lines is not supported\n");
return AVERROR(EINVAL);
}
s->csp = av_pix_fmt_desc_get(link->format);
if (s->csp->comp[0].depth > 8) {
s->filter_intra = filter_intra_16bit;
s->filter_line = filter_line_c_16bit;