[PATCH -next v3] 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]>

---
v3:
  - Separate declaration and assignment to make it more consistent.

v2: https://lore.kernel.org/all/[email protected]/T/
  - Pass the error code returned by kstrtoul() suggested by Geert.

v1: https://lore.kernel.org/all/[email protected]/T/
---
 drivers/sh/intc/userimask.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/sh/intc/userimask.c b/drivers/sh/intc/userimask.c
index abe9091827cd..a363f77881d1 100644
--- a/drivers/sh/intc/userimask.c
+++ b/drivers/sh/intc/userimask.c
@@ -32,8 +32,11 @@ store_intc_userimask(struct device *dev,
 		     const char *buf, size_t count)
 {
 	unsigned long level;
+	int ret;
 
-	level = simple_strtoul(buf, NULL, 10);
+	ret = kstrtoul(buf, 10, &level);
+	if (ret != 0)
+		return ret;
 
 	/*
 	 * Minimal acceptable IRQ levels are in the 2 - 16 range, but
-- 
2.34.1