From 25682362564fa0c950d9afe798def2ec9c3676a2 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Sat, 18 Aug 2012 18:55:41 +0300 Subject: [PATCH] video: mb862xxfb: prevent divide by zero bug Do a sanity check on these before using them as divisors. Signed-off-by: Dan Carpenter Acked-by: Anatolij Gustschin Signed-off-by: Florian Tobias Schandinat --- drivers/video/mb862xx/mb862xxfbdrv.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/video/mb862xx/mb862xxfbdrv.c b/drivers/video/mb862xx/mb862xxfbdrv.c index 00ce1f34b496..57d940be5f3d 100644 --- a/drivers/video/mb862xx/mb862xxfbdrv.c +++ b/drivers/video/mb862xx/mb862xxfbdrv.c @@ -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, -- 2.20.1