Q: Given the following code slice:
```
1 struct typec_altmode *
2 typec_partner_register_altmode(struct typec_partner *partner,
3 			       const struct typec_altmode_desc *desc)
4 {
5 	return typec_register_altmode(&partner->dev, desc);
6 }
7 static void typec_altmode_set_partner(struct altmode *altmode)
8 {
9 	struct typec_altmode *adev = &altmode->adev;
10 	struct typec_device_id id = { adev->svid, adev->mode, };
11 	struct typec_port *port = typec_altmode2port(adev);
12 	struct altmode *partner;
13 	struct device *dev;
14 
15 	dev = device_find_child(&port->dev, &id, altmode_match);
16 	if (!dev)
17 		return;
18 
19 	/* Bind the port alt mode to the partner/plug alt mode. */
20 	partner = to_altmode(to_typec_altmode(dev));
21 	altmode->partner = partner;
22 
23 	/* Bind the partner/plug alt mode to the port alt mode. */
24 	if (is_typec_plug(adev->dev.parent)) {
25 		struct typec_plug *plug = to_typec_plug(adev->dev.parent);
26 
27 		partner->plug[plug->index] = altmode;
28 	} else {
29 		partner->partner = altmode;
30 	}
31 }
32 int device_register(struct device *dev)
33 {
34 	device_initialize(dev);
35 	return device_add(dev);
36 }
37 static int altmode_match(struct device *dev, void *data)
38 {
39 	struct typec_altmode *adev = to_typec_altmode(dev);
40 	struct typec_device_id *id = data;
41 
42 	if (!is_typec_altmode(dev))
43 		return 0;
44 
45 	return ((adev->svid == id->svid) && (adev->mode == id->mode));
46 }
47 static int altmode_id_get(struct device *dev)
48 {
49 	struct ida *ids;
50 
51 	if (is_typec_partner(dev))
52 		ids = &to_typec_partner(dev)->mode_ids;
53 	else if (is_typec_plug(dev))
54 		ids = &to_typec_plug(dev)->mode_ids;
55 	else
56 		ids = &to_typec_port(dev)->mode_ids;
57 
58 	return ida_simple_get(ids, 0, 0, GFP_KERNEL);
59 }
60 static inline void * __must_check ERR_PTR(long error)
61 {
62 	return (void *) error;
63 }
64 void* memset(void* s, int c, size_t n)
65 {
66 	int i;
67 	char *ss = (char*)s;
68 
69 	for (i=0;i<n;i++) ss[i] = c;
70 	return s;
71 }
72 struct typec_port *typec_altmode2port(struct typec_altmode *alt)
73 {
74 	if (is_typec_plug(alt->dev.parent))
75 		return to_typec_port(alt->dev.parent->parent->parent);
76 	if (is_typec_partner(alt->dev.parent))
77 		return to_typec_port(alt->dev.parent->parent);
78 	if (is_typec_port(alt->dev.parent))
79 		return to_typec_port(alt->dev.parent);
80 
81 	return NULL;
82 }
83 struct typec_altmode *
84 typec_partner_register_altmode(struct typec_partner *partner,
85 			       const struct typec_altmode_desc *desc)
86 {
87 	return typec_register_altmode(&partner->dev, desc);
88 }
89 static inline void *kzalloc(size_t s, gfp_t gfp)
90 {
91 	void *p = kmalloc(s, gfp);
92 
93 	memset(p, 0, s);
94 	return p;
95 }
96 static void tcpm_register_partner_altmodes(struct tcpm_port *port)
97 {
98 	struct pd_mode_data *modep = &port->mode_data;
99 	struct typec_altmode *altmode;
100 	int i;
101 
102 	for (i = 0; i < modep->altmodes; i++) {
103 		altmode = typec_partner_register_altmode(port->partner,
104 						&modep->altmode_desc[i]);
105 		if (IS_ERR(altmode)) {
106 			tcpm_log(port, "Failed to register partner SVID 0x%04x",
107 				 modep->altmode_desc[i].svid);
108 			altmode = NULL;
109 		}
110 		port->partner_altmode[i] = altmode;
111 	}
112 }
113 static void altmode_id_remove(struct device *dev, int id)
114 {
115 	struct ida *ids;
116 
117 	if (is_typec_partner(dev))
118 		ids = &to_typec_partner(dev)->mode_ids;
119 	else if (is_typec_plug(dev))
120 		ids = &to_typec_plug(dev)->mode_ids;
121 	else
122 		ids = &to_typec_port(dev)->mode_ids;
123 
124 	ida_simple_remove(ids, id);
125 }
126 struct device *device_find_child(struct device *parent, void *data,
127 				 int (*match)(struct device *dev, void *data))
128 {
129 	struct klist_iter i;
130 	struct device *child;
131 
132 	if (!parent)
133 		return NULL;
134 
135 	klist_iter_init(&parent->p->klist_children, &i);
136 	while ((child = next_device(&i)))
137 		if (match(child, data) && get_device(child))
138 			break;
139 	klist_iter_exit(&i);
140 	return child;
141 }
142 static inline void *kmalloc(size_t s, gfp_t gfp)
143 {
144 	if (__kmalloc_fake)
145 		return __kmalloc_fake;
146 	return malloc(s);
147 }
148 void kobject_put(struct kobject *kobj)
149 {
150 	if (kobj) {
151 		if (!kobj->state_initialized)
152 			WARN(1, KERN_WARNING
153 				"kobject: '%s' (%p): is not initialized, yet kobject_put() is being called.\n",
154 			     kobject_name(kobj), kobj);
155 		kref_put(&kobj->kref, kobject_release);
156 	}
157 }
158 static struct typec_altmode *
159 typec_register_altmode(struct device *parent,
160 		       const struct typec_altmode_desc *desc)
161 {
162 	unsigned int id = altmode_id_get(parent);
163 	bool is_port = is_typec_port(parent);
164 	struct altmode *alt;
165 	int ret;
166 
167 	alt = kzalloc(sizeof(*alt), GFP_KERNEL);
168 	if (!alt) {
169 		altmode_id_remove(parent, id);
170 		return ERR_PTR(-ENOMEM);
171 	}
172 
173 	alt->adev.svid = desc->svid;
174 	alt->adev.mode = desc->mode;
175 	alt->adev.vdo = desc->vdo;
176 	alt->roles = desc->roles;
177 	alt->id = id;
178 
179 	alt->attrs[0] = &dev_attr_vdo.attr;
180 	alt->attrs[1] = &dev_attr_description.attr;
181 	alt->attrs[2] = &dev_attr_active.attr;
182 
183 	if (is_port) {
184 		alt->attrs[3] = &dev_attr_supported_roles.attr;
185 		alt->adev.active = true; /* Enabled by default */
186 	}
187 
188 	sprintf(alt->group_name, "mode%d", desc->mode);
189 	alt->group.name = alt->group_name;
190 	alt->group.attrs = alt->attrs;
191 	alt->groups[0] = &alt->group;
192 
193 	alt->adev.dev.parent = parent;
194 	alt->adev.dev.groups = alt->groups;
195 	alt->adev.dev.type = &typec_altmode_dev_type;
196 	dev_set_name(&alt->adev.dev, "%s.%u", dev_name(parent), id);
197 
198 	/* Link partners and plugs with the ports */
199 	if (!is_port)
200 		typec_altmode_set_partner(alt);
201 
202 	/* The partners are bind to drivers */
203 	if (is_typec_partner(parent))
204 		alt->adev.dev.bus = &typec_bus;
205 
206 	/* Plug alt modes need a class to generate udev events. */
207 	if (is_typec_plug(parent))
208 		alt->adev.dev.class = &typec_class;
209 
210 	ret = device_register(&alt->adev.dev);
211 	if (ret) {
212 		dev_err(parent, "failed to register alternate mode (%d)\n",
213 			ret);
214 		put_device(&alt->adev.dev);
215 		return ERR_PTR(ret);
216 	}
217 
218 	return &alt->adev;
219 }
220 int device_add(struct device *dev)
221 {
222 	struct device *parent;
223 	struct kobject *kobj;
224 	struct class_interface *class_intf;
225 	int error = -EINVAL;
226 	struct kobject *glue_dir = NULL;
227 
228 	dev = get_device(dev);
229 	if (!dev)
230 		goto done;
231 
232 	if (!dev->p) {
233 		error = device_private_init(dev);
234 		if (error)
235 			goto done;
236 	}
237 
238 	/*
239 	 * for statically allocated devices, which should all be converted
240 	 * some day, we need to initialize the name. We prevent reading back
241 	 * the name, and force the use of dev_name()
242 	 */
243 	if (dev->init_name) {
244 		dev_set_name(dev, "%s", dev->init_name);
245 		dev->init_name = NULL;
246 	}
247 
248 	/* subsystems can specify simple device enumeration */
249 	if (!dev_name(dev) && dev->bus && dev->bus->dev_name)
250 		dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id);
251 
252 	if (!dev_name(dev)) {
253 		error = -EINVAL;
254 		goto name_error;
255 	}
256 
257 	pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
258 
259 	parent = get_device(dev->parent);
260 	kobj = get_device_parent(dev, parent);
261 	if (IS_ERR(kobj)) {
262 		error = PTR_ERR(kobj);
263 		goto parent_error;
264 	}
265 	if (kobj)
266 		dev->kobj.parent = kobj;
267 
268 	/* use parent numa_node */
269 	if (parent && (dev_to_node(dev) == NUMA_NO_NODE))
270 		set_dev_node(dev, dev_to_node(parent));
271 
272 	/* first, register with generic layer. */
273 	/* we require the name to be set before, and pass NULL */
274 	error = kobject_add(&dev->kobj, dev->kobj.parent, NULL);
275 	if (error) {
276 		glue_dir = kobj;
277 		goto Error;
278 	}
279 
280 	/* notify platform of device entry */
281 	device_platform_notify(dev);
282 
283 	error = device_create_file(dev, &dev_attr_uevent);
284 	if (error)
285 		goto attrError;
286 
287 	error = device_add_class_symlinks(dev);
288 	if (error)
289 		goto SymlinkError;
290 	error = device_add_attrs(dev);
291 	if (error)
292 		goto AttrsError;
293 	error = bus_add_device(dev);
294 	if (error)
295 		goto BusError;
296 	error = dpm_sysfs_add(dev);
297 	if (error)
298 		goto DPMError;
299 	device_pm_add(dev);
300 
301 	if (MAJOR(dev->devt)) {
302 		error = device_create_file(dev, &dev_attr_dev);
303 		if (error)
304 			goto DevAttrError;
305 
306 		error = device_create_sys_dev_entry(dev);
307 		if (error)
308 			goto SysEntryError;
309 
310 		devtmpfs_create_node(dev);
311 	}
312 
313 	/* Notify clients of device addition.  This call must come
314 	 * after dpm_sysfs_add() and before kobject_uevent().
315 	 */
316 	if (dev->bus)
317 		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
318 					     BUS_NOTIFY_ADD_DEVICE, dev);
319 
320 	kobject_uevent(&dev->kobj, KOBJ_ADD);
321 
322 	/*
323 	 * Check if any of the other devices (consumers) have been waiting for
324 	 * this device (supplier) to be added so that they can create a device
325 	 * link to it.
326 	 *
327 	 * This needs to happen after device_pm_add() because device_link_add()
328 	 * requires the supplier be registered before it's called.
329 	 *
330 	 * But this also needs to happen before bus_probe_device() to make sure
331 	 * waiting consumers can link to it before the driver is bound to the
332 	 * device and the driver sync_state callback is called for this device.
333 	 */
334 	if (dev->fwnode && !dev->fwnode->dev) {
335 		dev->fwnode->dev = dev;
336 		fw_devlink_link_device(dev);
337 	}
338 
339 	bus_probe_device(dev);
340 
341 	/*
342 	 * If all driver registration is done and a newly added device doesn't
343 	 * match with any driver, don't block its consumers from probing in
344 	 * case the consumer device is able to operate without this supplier.
345 	 */
346 	if (dev->fwnode && fw_devlink_drv_reg_done && !dev->can_match)
347 		fw_devlink_unblock_consumers(dev);
348 
349 	if (parent)
350 		klist_add_tail(&dev->p->knode_parent,
351 			       &parent->p->klist_children);
352 
353 	if (dev->class) {
354 		mutex_lock(&dev->class->p->mutex);
355 		/* tie the class to the device */
356 		klist_add_tail(&dev->p->knode_class,
357 			       &dev->class->p->klist_devices);
358 
359 		/* notify any interfaces that the device is here */
360 		list_for_each_entry(class_intf,
361 				    &dev->class->p->interfaces, node)
362 			if (class_intf->add_dev)
363 				class_intf->add_dev(dev, class_intf);
364 		mutex_unlock(&dev->class->p->mutex);
365 	}
366 done:
367 	put_device(dev);
368 	return error;
369  SysEntryError:
370 	if (MAJOR(dev->devt))
371 		device_remove_file(dev, &dev_attr_dev);
372  DevAttrError:
373 	device_pm_remove(dev);
374 	dpm_sysfs_remove(dev);
375  DPMError:
376 	dev->driver = NULL;
377 	bus_remove_device(dev);
378  BusError:
379 	device_remove_attrs(dev);
380  AttrsError:
381 	device_remove_class_symlinks(dev);
382  SymlinkError:
383 	device_remove_file(dev, &dev_attr_uevent);
384  attrError:
385 	device_platform_notify_remove(dev);
386 	kobject_uevent(&dev->kobj, KOBJ_REMOVE);
387 	glue_dir = get_glue_dir(dev);
388 	kobject_del(&dev->kobj);
389  Error:
390 	cleanup_glue_dir(dev, glue_dir);
391 parent_error:
392 	put_device(parent);
393 name_error:
394 	kfree(dev->p);
395 	dev->p = NULL;
396 	goto done;
397 }
398 void put_device(struct device *dev)
399 {
400 	/* might_sleep(); */
401 	if (dev)
402 		kobject_put(&dev->kobj);
403 }
```
which has a CWE-476 vulnerability at line:
```
5 	return typec_register_altmode(&partner->dev, desc);
```
Please generate five possible patches for the vulnerability.