File 0177-drm-sti-sti_vtg-Handle-return-NULL-error-from-devm_i.patch of Package drm.openSUSE_Leap_42.3_Update

From 38fa955da2516bb8bf5f0a75041856016e524d7c Mon Sep 17 00:00:00 2001
From: Arvind Yadav <arvind.yadav.cs@gmail.com>
Date: Wed, 21 Dec 2016 11:00:12 +0530
Subject: [PATCH] drm/sti: sti_vtg: Handle return NULL error from
 devm_ioremap_nocache

[ Upstream commit 1ae0d5af347df224a6e76334683f13a96d915a44 ]

Here, If devm_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@gmail.com>
Acked-by: Vincent Abriou <vincent.abriou@st.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/sti/sti_vtg.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/sti/sti_vtg.c
+++ b/drivers/gpu/drm/sti/sti_vtg.c
@@ -429,6 +429,10 @@ static int vtg_probe(struct platform_dev
 		return -ENOMEM;
 	}
 	vtg->regs = devm_ioremap_nocache(dev, res->start, resource_size(res));
+	if (!vtg->regs) {
+		DRM_ERROR("failed to remap I/O memory\n");
+		return -ENOMEM;
+	}
 
 	np = of_parse_phandle(pdev->dev.of_node, "st,slave", 0);
 	if (np) {