Patch "video: fbdev: cobalt_lcdfb: Handle return NULL error from devm_ioremap" has been added to the 4.9-stable tree

Patch "video: fbdev: cobalt_lcdfb: Handle return NULL error from devm_ioremap" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

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

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     video-fbdev-cobalt_lcdfb-handle-return-null-error-from-devm_ioremap.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Fri Aug  4 15:30:10 PDT 2017
From: Arvind Yadav <arvind.yadav.cs@gmail.com>
Date: Tue, 13 Dec 2016 13:50:52 +0530
Subject: video: fbdev: cobalt_lcdfb: Handle return NULL error from devm_ioremap

From: Arvind Yadav <arvind.yadav.cs@gmail.com>


[ Upstream commit 4dcd19bfabaee8f9f4bcf203afba09b98ccbaf76 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/video/fbdev/cobalt_lcdfb.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/video/fbdev/cobalt_lcdfb.c
+++ b/drivers/video/fbdev/cobalt_lcdfb.c
@@ -308,6 +308,11 @@ static int cobalt_lcdfb_probe(struct pla
 	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;


Patches currently in stable-queue which might be from arvind.yadav.cs@gmail.com are

queue-4.9/vfio-pci-handle-error-from-pci_iomap.patch
queue-4.9/video-fbdev-cobalt_lcdfb-handle-return-null-error-from-devm_ioremap.patch