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lavfi/drawutils: ensure we don't allow mixed-byte-depth formats

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These could be hazardous because of FFDrawColor's union
This commit is contained in:
rcombs 2021-12-23 19:28:35 -06:00
parent e24b71add5
commit f00079b25c
1 changed files with 7 additions and 0 deletions
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7
libavfilter/drawutils.c
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@ -83,6 +83,7 @@ int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
unsigned i, nb_planes = 0;
int pixelstep[MAX_PLANES] = { 0 };
int full_range = 0;
int depthb = 0;
if (!desc || !desc->name)
return AVERROR(EINVAL);
@ -96,6 +97,7 @@ int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
format == AV_PIX_FMT_YUVJ411P || format == AV_PIX_FMT_YUVJ440P)
full_range = 1;
for (i = 0; i < desc->nb_components; i++) {
int db;
c = &desc->comp[i];
/* for now, only 8-16 bits formats */
if (c->depth < 8 || c->depth > 16)
@ -105,6 +107,11 @@ int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
/* data must either be in the high or low bits, never middle */
if (c->shift && ((c->shift + c->depth) & 0x7))
return AVERROR(ENOSYS);
/* mixed >8 and <=8 depth */
db = (c->depth + 7) / 8;
if (depthb && (depthb != db))
return AVERROR(ENOSYS);
depthb = db;
/* strange interleaving */
if (pixelstep[c->plane] != 0 &&
pixelstep[c->plane] != c->step)