From: Arvind Yadav <arvind.yadav.cs@gmail.com>
Date: Tue, 13 Dec 2016 08:20:52 +0000 (+0530)
Subject: video: fbdev: cobalt_lcdfb: Handle return NULL error from devm_ioremap
X-Git-Tag: v4.14-rc1~1753^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4dcd19bfabaee8f9f4bcf203afba09b98ccbaf76;p=platform%2Fkernel%2Flinux-rpi3.git

video: fbdev: cobalt_lcdfb: Handle return NULL error from devm_ioremap

Here, If devm_ioremap will fail. It will return NULL.
Kernel can run into a NULL-pointer dereference.
This error check will avoid NULL pointer dereference.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Acked-by: Yoichi Yuasa <yuasa@linux-mips.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---

diff --git a/drivers/video/fbdev/cobalt_lcdfb.c b/drivers/video/fbdev/cobalt_lcdfb.c
index 2d3b691..038ac69 100644
--- a/drivers/video/fbdev/cobalt_lcdfb.c
+++ b/drivers/video/fbdev/cobalt_lcdfb.c
@@ -308,6 +308,11 @@ static int cobalt_lcdfb_probe(struct platform_device *dev)
 	info->screen_size = resource_size(res);
 	info->screen_base = devm_ioremap(&dev->dev, res->start,
 					 info->screen_size);
+	if (!info->screen_base) {
+		framebuffer_release(info);
+		return -ENOMEM;
+	}
+
 	info->fbops = &cobalt_lcd_fbops;
 	info->fix = cobalt_lcdfb_fix;
 	info->fix.smem_start = res->start;