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fbdev: tdfxfb: avoid divide-by-zero on FBIOPUT_VSCREENINFO

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Much like commit 19f953e743 ("fbdev: fb_pm2fb: Avoid potential divide
by zero error"), we also need to prevent that same crash from happening
in the udlfb driver as it uses pixclock directly when dividing, which
will crash.

Cc: Helge Deller <deller@gmx.de>
Assisted-by: gregkh_clanker_t1000
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Greg Kroah-Hartman 2026-04-09 15:23:14 +02:00 committed by Helge Deller
parent 98cf7df6e0
commit 8f98b81fe0
1 changed files with 3 additions and 0 deletions
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3
drivers/video/fbdev/tdfxfb.c
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@ -497,6 +497,9 @@ static int tdfxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
}
}
if (!var->pixclock)
return -EINVAL;
if (PICOS2KHZ(var->pixclock) > par->max_pixclock) {
DPRINTK("pixclock too high (%ldKHz)\n",
PICOS2KHZ(var->pixclock));