[PATCH 3.10 138/268] ata: sata_mv:- Handle return value of devm_ioremap.

Willy Tarreau
2017-06-19T18:54:17Z

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

commit 064c3db9c564cc5be514ac21fb4aa26cc33db746 upstream.

Here, If devm_ioremap will fail. It will return NULL.
Then hpriv->base = NULL - 0x20000; 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>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
drivers/ata/sata_mv.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index b256ff5..d9f45c8 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -4097,6 +4097,9 @@ static int mv_platform_probe(struct platform_device *pdev)
host->iomap = NULL;
hpriv->base = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
+ if (!hpriv->base)
+ return -ENOMEM;
+
hpriv->base -= SATAHC0_REG_BASE;

#if defined(CONFIG_HAVE_CLK)
--
2.8.0.rc2.1.gbe9624a