From: Danila Chernetsov <listdansp@mail.ru>
To: Helge Deller <deller@gmx.de>
Cc: Danila Chernetsov <listdansp@mail.ru>,
linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org, lvc-project@linuxtesting.org
Subject: [PATCH] video: fbdev: sm501fb: Add some geometry checks.
Date: Wed, 19 Mar 2025 01:30:11 +0000 [thread overview]
Message-ID: <20250319013011.467530-1-listdansp@mail.ru> (raw)
Added checks for xoffset, yoffset settings.
Incorrect settings of these parameters can lead to errors
in sm501fb_pan_ functions.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 5fc404e47bdf ("[PATCH] fb: SM501 framebuffer driver")
Signed-off-by: Danila Chernetsov <listdansp@mail.ru>
---
drivers/video/fbdev/sm501fb.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/video/fbdev/sm501fb.c b/drivers/video/fbdev/sm501fb.c
index 7734377b2d87..ed6f4f43e2d5 100644
--- a/drivers/video/fbdev/sm501fb.c
+++ b/drivers/video/fbdev/sm501fb.c
@@ -327,6 +327,13 @@ static int sm501fb_check_var(struct fb_var_screeninfo *var,
if (var->xres_virtual > 4096 || var->yres_virtual > 2048)
return -EINVAL;
+ /* geometry sanity checks */
+ if (var->xres + var->xoffset > var->xres_virtual)
+ return -EINVAL;
+
+ if (var->yres + var->yoffset > var->yres_virtual)
+ return -EINVAL;
+
/* can cope with 8,16 or 32bpp */
if (var->bits_per_pixel <= 8)
--
2.25.1
next reply other threads:[~2025-03-19 1:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-19 1:30 Danila Chernetsov [this message]
2025-03-19 21:38 ` [PATCH] video: fbdev: sm501fb: Add some geometry checks Helge Deller
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