[PATCH -next v2] sh: intc: replace simple_strtoul to kstrtoul

The function simple_strtoul performs no error checking
in scenarios where the input value overflows the intended
output variable.

We can replace the use of the simple_strtoul with the safer
alternatives kstrtoul. For fail case, we also print the extra
message.

Signed-off-by: Hongbo Li <[email protected]>

---
v2:
  - Pass the error code returned by kstrtoul() suggested by Geert.

v1: https://lore.kernel.org/all/[email protected]/T/
---
 drivers/sh/intc/userimask.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/sh/intc/userimask.c b/drivers/sh/intc/userimask.c
index abe9091827cd..5d7801b76715 100644
--- a/drivers/sh/intc/userimask.c
+++ b/drivers/sh/intc/userimask.c
@@ -32,8 +32,10 @@ store_intc_userimask(struct device *dev,
 		     const char *buf, size_t count)
 {
 	unsigned long level;
+	int ret = kstrtoul(buf, 10, &level);
 
-	level = simple_strtoul(buf, NULL, 10);
+	if (ret != 0)
+		return ret;
 
 	/*
 	 * Minimal acceptable IRQ levels are in the 2 - 16 range, but
-- 
2.34.1