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 2d3b691f3fc4885414ae9234950d8e9c798e5fe6..038ac6934fe9d7f865f9711f24fecadc27071b65 100644 (file)
--- 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;