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libavfilter: guard against ff_draw_init/ff_draw_init2 failures

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The return value of ff_draw_init and ff_draw_init2 are not checked in
most usages. However, if they return an error, they don't get to the
point where they set the attributes of the FFDrawContext. These
functions are typically used in conjunction with ff_draw_color, which
checks draw->desc->flags, causing a null pointer dereference.

Signed-off-by: Nil Fons Miret <nilf@netflix.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Nil Fons Miret
2025-02-21 01:18:21 +00:00
committed by Michael Niedermayer
parent bdc07f372a
commit 9899da8175
12 changed files with 109 additions and 26 deletions
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libavfilter/vf_tile.c
+6 -1
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@@ -128,6 +128,7 @@ static int config_props(AVFilterLink *outlink)
FilterLink *ol = ff_filter_link(outlink);
const unsigned total_margin_w = (tile->w - 1) * tile->padding + 2*tile->margin;
const unsigned total_margin_h = (tile->h - 1) * tile->padding + 2*tile->margin;
int ret;
if (inlink->w > (INT_MAX - total_margin_w) / tile->w) {
av_log(ctx, AV_LOG_ERROR, "Total width %ux%u is too much.\n",
@@ -143,7 +144,11 @@ static int config_props(AVFilterLink *outlink)
outlink->h = tile->h * inlink->h + total_margin_h;
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
ol->frame_rate = av_mul_q(il->frame_rate, av_make_q(1, tile->nb_frames - tile->overlap));
ff_draw_init2(&tile->draw, inlink->format, inlink->colorspace, inlink->color_range, 0);
ret = ff_draw_init2(&tile->draw, inlink->format, inlink->colorspace, inlink->color_range, 0);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Failed to initialize FFDrawContext\n");
return ret;
}
ff_draw_color(&tile->draw, &tile->blank, tile->rgba_color);
return 0;