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video: mb862xxfb: prevent divide by zero bug

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Do a sanity check on these before using them as divisors.

Signed-off-by: Dan Carpenter <[email protected]>
Acked-by: Anatolij Gustschin <[email protected]>
Signed-off-by: Florian Tobias Schandinat <[email protected]>
This commit is contained in:
Dan Carpenter 2012-08-18 18:55:41 +03:00 • committed by Florian Tobias Schandinat
commit 2568236256
1 changed files with 2 additions and 0 deletions
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drivers/video/mb862xx/mb862xxfbdrv.c
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@ -328,6 +328,8 @@ static int mb862xxfb_ioctl(struct fb_info *fbi, unsigned int cmd,
case MB862XX_L1_SET_CFG:
if (copy_from_user(l1_cfg, argp, sizeof(*l1_cfg)))
return -EFAULT;
if (l1_cfg->dh == 0 || l1_cfg->dw == 0)
return -EINVAL;
if ((l1_cfg->sw >= l1_cfg->dw) && (l1_cfg->sh >= l1_cfg->dh)) {
/* downscaling */
outreg(cap, GC_CAP_CSC,