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: Jean Delvare <jdelvare@xxxxxxxx>
Cc: Wolfram Sang <wsa@xxxxxxxxxxxxx>
Cc: linux-i2c@xxxxxxxxxxxxxxx
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
---
drivers/i2c/busses/i2c-i801.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 679c6c41f64b..fc6ccb8aba17 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -1068,7 +1068,10 @@ static void __init input_apanel_init(void)
void __iomem *bios;
const void __iomem *p;
- bios = ioremap(0xF0000, 0x10000); /* Can't fail */
+ bios = ioremap(0xF0000, 0x10000);
+ if (!base)
+ return -ENOMEM;
+
p = bios_signature(bios);
if (p) {
/* just use the first address */
--
2.20.1
