[PATCH v1] video : fbdev : stifb :- Handle return NULL error from ioremap_nocache.

[Arvind Yadav]

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...@gmail.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