[patch] video: mb862xxfb: prevent divide by zero bug
From: Dan Carpenter <hidden>
Date: 2012-08-18 15:55:41
Also in:
kernel-janitors, linux-devicetree
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
Do a sanity check on these before using them as divisors. Signed-off-by: Dan Carpenter <redacted>
diff --git a/drivers/video/mb862xx/mb862xxfbdrv.c b/drivers/video/mb862xx/mb862xxfbdrv.c
index 00ce1f3..57d940b 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,