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avfilter/vf_palettegen: add protection against potential divide by zero

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In libavfilter/vf_palettegen.c, the function get_avg_color requires
that box->len greater than zero to avoid dividing by zero. However,
the call sequence filter_frame -> get_palette_frame -> get_avg_color
may not satisfy this precondition. Fixes #9222.

Signed-off-by: Yiyuan GUO <yguoaz@gmail.com>
This commit is contained in:
Yiyuan GUO 2021-05-15 13:54:35 +08:00 committed by Paul B Mahol
parent 910a24eb33
commit 2201c91fbf
1 changed files with 1 additions and 1 deletions
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libavfilter/vf_palettegen.c
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@ -528,7 +528,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
if (s->stats_mode == STATS_MODE_DIFF_FRAMES) {
av_frame_free(&s->prev_frame);
s->prev_frame = in;
} else if (s->stats_mode == STATS_MODE_SINGLE_FRAMES) {
} else if (s->stats_mode == STATS_MODE_SINGLE_FRAMES && s->nb_refs > 0) {
AVFrame *out;
int i;