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Date:   Fri, 10 May 2019 11:03:19 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Miloslav Trmac <mitr@...ny.cz>,
        Wolfram Sang <wsa@...-dreams.de>,
        <linux-input@...r.kernel.org>, Hulk Robot <hulkci@...wei.com>
Subject: [PATCH 2/3] Input: wistron_btns: avoid panic if ioreamp fails

If ioremap fails, NULL pointer dereference will happen and
leading to a kernel panic when access the virtual address
in check_signature().

Fix it by check the return value of ioremap.

Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Miloslav Trmac <mitr@...ny.cz>
Cc: Wolfram Sang <wsa@...-dreams.de>
Cc: linux-input@...r.kernel.org
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 drivers/input/misc/wistron_btns.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/input/misc/wistron_btns.c b/drivers/input/misc/wistron_btns.c
index 43e67f546366..a82ec3d102b4 100644
--- a/drivers/input/misc/wistron_btns.c
+++ b/drivers/input/misc/wistron_btns.c
@@ -107,7 +107,10 @@ static int __init map_bios(void)
 	ssize_t offset;
 	u32 entry_point;
 
-	base = ioremap(0xF0000, 0x10000); /* Can't fail */
+	base = ioremap(0xF0000, 0x10000);
+	if (!base)
+		return -ENOMEM;
+
 	offset = locate_wistron_bios(base);
 	if (offset < 0) {
 		printk(KERN_ERR "wistron_btns: BIOS entry point not found\n");
-- 
2.20.1

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