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fbdev: sm501fb: Add some geometry checks.

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[ Upstream commit aee50bd88ea5fde1ff4cc021385598f81a65830c ]

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: 5fc404e47b ("[PATCH] fb: SM501 framebuffer driver")
Signed-off-by: Danila Chernetsov <listdansp@mail.ru>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Danila Chernetsov 2025-03-19 01:30:11 +00:00 • committed by Greg Kroah-Hartman
commit 90ab169fb9
1 changed files with 7 additions and 0 deletions
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7
drivers/video/fbdev/sm501fb.c
View file

@ -326,6 +326,13 @@ 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)