From f67bd3a8254f50676dee037a0c0b31e4148c1a85 Mon Sep 17 00:00:00 2001
From: rcombs <rcombs@rcombs.me>
Date: Thu, 23 Dec 2021 20:56:50 -0600
Subject: [PATCH] lavfi/drawutils: ensure we don't support formats with
 non-pixel-sized offsets

---
 libavfilter/drawutils.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavfilter/drawutils.c b/libavfilter/drawutils.c
index bcdb669bd3..5308fcbc0f 100644
--- a/libavfilter/drawutils.c
+++ b/libavfilter/drawutils.c
@@ -114,6 +114,8 @@ int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
         depthb = db;
         if (db * (c->offset + 1) > 16)
             return AVERROR(ENOSYS);
+        if (c->offset % db)
+            return AVERROR(ENOSYS);
         /* strange interleaving */
         if (pixelstep[c->plane] != 0 &&
             pixelstep[c->plane] != c->step)