Q: Given the following code slice:
```
1 SSIZE_T ConvertUtf8NToWChar(const char* str, size_t len, WCHAR* wstr, size_t wlen)
2 {
3 	size_t ilen = strnlen(str, len);
4 	BOOL isNullTerminated = FALSE;
5 	if (len == 0)
6 		return 0;
7 
8 	WINPR_ASSERT(str);
9 
10 	if ((len > INT32_MAX) || (wlen > INT32_MAX))
11 	{
12 		SetLastError(ERROR_INVALID_PARAMETER);
13 		return -1;
14 	}
15 	if (ilen < len)
16 	{
17 		isNullTerminated = TRUE;
18 		ilen++;
19 	}
20 
21 	const int iwlen = (int)wlen;
22 	const int rc = MultiByteToWideChar(CP_UTF8, 0, str, (int)ilen, wstr, iwlen);
23 	if ((rc <= 0) || ((wlen > 0) && (rc > iwlen)))
24 		return -1;
25 	if (!isNullTerminated)
26 	{
27 		if (wstr && (rc < iwlen))
28 			wstr[rc] = '\0';
29 		return rc;
30 	}
31 	else if (rc == iwlen)
32 	{
33 		if (wstr && (wstr[rc - 1] != '\0'))
34 			return rc;
35 	}
36 	return rc - 1;
37 }
38 VOID SetLastError(DWORD dwErrCode)
39 {
40 	PTEB pt = NtCurrentTeb();
41 	if (pt)
42 	{
43 		pt->LastErrorValue = dwErrCode;
44 	}
45 }
46 SSIZE_T Stream_Write_UTF16_String_From_UTF8(wStream* s, size_t dlen, const char* src, size_t length,
47                                             BOOL fill)
48 {
49 	WCHAR* str = Stream_PointerAs(s, WCHAR);
50 
51 	if (length == 0)
52 		return 0;
53 
54 	if (!Stream_CheckAndLogRequiredCapacityOfSize(STREAM_TAG, s, dlen, sizeof(WCHAR)))
55 		return -1;
56 
57 	SSIZE_T rc = ConvertUtf8NToWChar(src, length, str, dlen);
58 	if (rc < 0)
59 		return -1;
60 
61 	Stream_Seek(s, (size_t)rc * sizeof(WCHAR));
62 
63 	if (fill)
64 		Stream_Zero(s, (dlen - (size_t)rc) * sizeof(WCHAR));
65 	return rc;
66 }
67 static BOOL rdp_write_logon_info_v1(wStream* s, logon_info* info)
68 {
69 	const size_t charLen = 52 / sizeof(WCHAR);
70 	const size_t userCharLen = 512 / sizeof(WCHAR);
71 
72 	size_t sz = 4 + 52 + 4 + 512 + 4;
73 	size_t len = 0;
74 
75 	if (!Stream_EnsureRemainingCapacity(s, sz))
76 		return FALSE;
77 
78 	/* domain */
79 	WINPR_ASSERT(info);
80 
81 	len = strnlen(info->domain, charLen + 1);
82 	if (len > charLen)
83 		return FALSE;
84 
85 	Stream_Write_UINT32(s, len * sizeof(WCHAR));
86 	if (Stream_Write_UTF16_String_From_UTF8(s, charLen, info->domain, len, TRUE) < 0)
87 		return FALSE;
88 
89 	/* username */
90 	len = strnlen(info->username, userCharLen + 1);
91 	if (len > userCharLen)
92 		return FALSE;
93 
94 	Stream_Write_UINT32(s, len * sizeof(WCHAR));
95 	if (Stream_Write_UTF16_String_From_UTF8(s, userCharLen, info->username, len, TRUE) < 0)
96 		return FALSE;
97 
98 	/* sessionId */
99 	Stream_Write_UINT32(s, info->sessionId);
100 	return TRUE;
101 }
102 BOOL Stream_EnsureRemainingCapacity(wStream* s, size_t size)
103 {
104 	if (Stream_GetPosition(s) + size > Stream_Capacity(s))
105 		return Stream_EnsureCapacity(s, Stream_Capacity(s) + size);
106 	return TRUE;
107 }
108 BOOL Stream_SetPosition(wStream* _s, size_t _p)
109 {
110 	if ((_p) > Stream_Capacity(_s))
111 	{
112 		_s->pointer = _s->buffer;
113 		return FALSE;
114 	}
115 	_s->pointer = _s->buffer + (_p);
116 	return TRUE;
117 }
118 BOOL Stream_EnsureCapacity(wStream* s, size_t size)
119 {
120 	WINPR_ASSERT(s);
121 	if (s->capacity < size)
122 	{
123 		size_t position = 0;
124 		size_t old_capacity = 0;
125 		size_t new_capacity = 0;
126 		BYTE* new_buf = NULL;
127 
128 		old_capacity = s->capacity;
129 		new_capacity = old_capacity;
130 
131 		do
132 		{
133 			new_capacity *= 2;
134 		} while (new_capacity < size);
135 
136 		position = Stream_GetPosition(s);
137 
138 		if (!s->isOwner)
139 		{
140 			new_buf = (BYTE*)malloc(new_capacity);
141 			CopyMemory(new_buf, s->buffer, s->capacity);
142 			s->isOwner = TRUE;
143 		}
144 		else
145 		{
146 			new_buf = (BYTE*)realloc(s->buffer, new_capacity);
147 		}
148 
149 		if (!new_buf)
150 			return FALSE;
151 		s->buffer = new_buf;
152 		s->capacity = new_capacity;
153 		s->length = new_capacity;
154 		ZeroMemory(&s->buffer[old_capacity], s->capacity - old_capacity);
155 
156 		Stream_SetPosition(s, position);
157 	}
158 	return TRUE;
159 }
160 PTEB NtCurrentTeb(void)
161 {
162 	PTEB teb = NULL;
163 
164 	if (pthread_once(&sTebOnceControl, sTebInitOnce) == 0)
165 	{
166 		if ((teb = pthread_getspecific(sTebKey)) == NULL)
167 		{
168 			teb = calloc(1, sizeof(TEB));
169 			if (teb)
170 				pthread_setspecific(sTebKey, teb);
171 		}
172 	}
173 	return teb;
174 }
175 SSIZE_T ConvertUtf8NToWChar(const char* str, size_t len, WCHAR* wstr, size_t wlen)
176 {
177 	size_t ilen = strnlen(str, len);
178 	BOOL isNullTerminated = FALSE;
179 	if (len == 0)
180 		return 0;
181 
182 	WINPR_ASSERT(str);
183 
184 	if (len > INT32_MAX)
185 	{
186 		SetLastError(ERROR_INVALID_PARAMETER);
187 		return -1;
188 	}
189 	if (ilen < len)
190 	{
191 		isNullTerminated = TRUE;
192 		ilen++;
193 	}
194 
195 	const int iwlen = MIN(INT32_MAX, wlen);
196 	const int rc = MultiByteToWideChar(CP_UTF8, 0, str, (int)ilen, wstr, (int)iwlen);
197 	if ((rc <= 0) || ((wlen > 0) && (rc > iwlen)))
198 		return -1;
199 	if (!isNullTerminated)
200 	{
201 		if (wstr && (rc < iwlen))
202 			wstr[rc] = '\0';
203 		return rc;
204 	}
205 	else if (rc == iwlen)
206 	{
207 		if (wstr && (wstr[rc - 1] != '\0'))
208 			return rc;
209 	}
210 	return rc - 1;
211 }
```
which has a vulnerability among CWE-476 and among lines:
```
8 	WINPR_ASSERT(str);
```
Please generate five possible patches for the vulnerability.