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[2/3] Input: wistron_btns: avoid panic if ioreamp fails

Message ID 20190510030320.109154-2-wangkefeng.wang@huawei.com (mailing list archive)
State New, archived
Headers show
Series [1/3] Input: apanel: avoid panic if ioreamp fails | expand

Commit Message

Kefeng Wang May 10, 2019, 3:03 a.m. UTC 
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@gmail.com>
Cc: Miloslav Trmac <mitr@volny.cz>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: linux-input@vger.kernel.org
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
 drivers/input/misc/wistron_btns.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff mbox series

Patch

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");