1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/mfd/aat2870-core.c b/drivers/mfd/aat2870-core.c
index 14d9542a4eed..4e6e03d63e12 100644
--- a/drivers/mfd/aat2870-core.c
+++ b/drivers/mfd/aat2870-core.c
@@ -303,7 +303,10 @@ static ssize_t aat2870_reg_write_file(struct file *file,
         while (*start == ' ')
                 start++;
 
-        addr = simple_strtoul(start, &start, 16);
+        ret = kstrtoul(start, 16, &addr);
+        if (ret)
+                return ret;
+
         if (addr >= AAT2870_REG_NUM) {
                 dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr);
                 return -EINVAL;