linux-kernel - [PATCH] char: hpet: fix a missing check of ioremap

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Message-Id: <20190309035024.31298-1-kjlu@umn.edu>
Date:   Fri,  8 Mar 2019 21:50:24 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Clemens Ladisch <clemens@...isch.de>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] char: hpet: fix a missing check of ioremap

Check if ioremap fails, and if so, return AE_ERROR.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/char/hpet.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index d0ad85900b79..3a1e6b3ccd10 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -973,6 +973,8 @@ static acpi_status hpet_resources(struct acpi_resource *res, void *data)
 	if (ACPI_SUCCESS(status)) {
 		hdp->hd_phys_address = addr.address.minimum;
 		hdp->hd_address = ioremap(addr.address.minimum, addr.address.address_length);
+		if (!hdp->hd_address)
+			return AE_ERROR;
 
 		if (hpet_is_known(hdp)) {
 			iounmap(hdp->hd_address);
-- 
2.17.1