linux-kernel - [PATCH AUTOSEL for-4.4 10/39] drm/sti: sti_vtg: Handle return NULL error from devm_ioremap

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Date:   Wed, 8 Nov 2017 20:50:36 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@....verizon.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Arvind Yadav <arvind.yadav.cs@...il.com>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@....verizon.com>
Subject: [PATCH AUTOSEL for-4.4 10/39] drm/sti: sti_vtg: Handle return NULL
 error from devm_ioremap_nocache

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

[ 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@...il.com>
Acked-by: Vincent Abriou <vincent.abriou@...com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/gpu/drm/sti/sti_vtg.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/sti/sti_vtg.c b/drivers/gpu/drm/sti/sti_vtg.c
index d56630c60039..117a2f52fb4e 100644
--- a/drivers/gpu/drm/sti/sti_vtg.c
+++ b/drivers/gpu/drm/sti/sti_vtg.c
@@ -346,6 +346,10 @@ static int vtg_probe(struct platform_device *pdev)
 		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) {
-- 
2.11.0