linux-kernel - [PATCH v1] video : fbdev : stifb :- Handle return NULL error from ioremap

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Date:   Wed, 18 Jan 2017 15:51:51 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     jejb@...isc-linux.org, deller@....de, b.zolnierkie@...sung.com
Cc:     linux-parisc@...r.kernel.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1] video : fbdev : stifb :- Handle return NULL error from ioremap_nocache.

Here, If ioremap_nocache 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@...il.com>
---
 drivers/video/fbdev/stifb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/video/fbdev/stifb.c b/drivers/video/fbdev/stifb.c
index accfef7..d5deab3 100644
--- a/drivers/video/fbdev/stifb.c
+++ b/drivers/video/fbdev/stifb.c
@@ -1294,6 +1294,10 @@ static int __init stifb_init_fb(struct sti_struct *sti, int bpp_pref)
 	strcpy(fix->id, "stifb");
 	info->fbops = &stifb_ops;
 	info->screen_base = ioremap_nocache(REGION_BASE(fb,1), fix->smem_len);
+	if (!info->screen_base) {
+		printk(KERN_ERR "stifb: Failed to Map memory\n");
+		goto out_err0;
+	}
 	info->screen_size = fix->smem_len;
 	info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_COPYAREA;
 	info->pseudo_palette = &fb->pseudo_palette;
-- 
1.9.1