diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index b1d1ac25237b..c9198723e4cb 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -1760,6 +1760,10 @@ static ssize_t btrfs_devinfo_scrub_speed_max_store(struct kobject *kobj,
 	unsigned long long limit;
 
 	limit = memparse(buf, &endptr);
+	/* There could be trailing '\n', also catch any typos after the value. */
+	endptr = skip_spaces(endptr);
+	if (*endptr != 0)
+		return -EINVAL;
 	WRITE_ONCE(device->scrub_speed_max, limit);
 	return len;
 }