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fbdev: intelfb: Fix potential divide by zero

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[ Upstream commit d823685486 ]

Variable var->pixclock is controlled by user and can be assigned
to zero. Without proper check, divide by zero would occur in
intelfbhw_validate_mode and intelfbhw_mode_to_hw.

Error out if var->pixclock is zero.

Signed-off-by: Wei Chen <harperchen1110@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wei Chen
2023-03-15 08:33:47 +00:00
committed by Greg Kroah-Hartman
parent 78eb964805
commit c2be7f8056
1 changed files with 3 additions and 0 deletions
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3
drivers/video/fbdev/intelfb/intelfbdrv.c
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@@ -1214,6 +1214,9 @@ static int intelfb_check_var(struct fb_var_screeninfo *var,
dinfo = GET_DINFO(info); dinfo = GET_DINFO(info);
if (!var->pixclock)
return -EINVAL;
/* update the pitch */ /* update the pitch */
if (intelfbhw_validate_mode(dinfo, var) != 0) if (intelfbhw_validate_mode(dinfo, var) != 0)
return -EINVAL; return -EINVAL;