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Commit | Line | Data |
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6b3bd08f | 1 | /* |
0b81d077 | 2 | * This contains functions for filename crypto management |
6b3bd08f JK |
3 | * |
4 | * Copyright (C) 2015, Google, Inc. | |
5 | * Copyright (C) 2015, Motorola Mobility | |
6 | * | |
6b3bd08f | 7 | * Written by Uday Savagaonkar, 2014. |
0b81d077 | 8 | * Modified by Jaegeuk Kim, 2015. |
6b3bd08f JK |
9 | * |
10 | * This has not yet undergone a rigorous security audit. | |
11 | */ | |
0b81d077 | 12 | |
6b3bd08f | 13 | #include <linux/scatterlist.h> |
6b3bd08f | 14 | #include <linux/ratelimit.h> |
3325bea5 | 15 | #include "fscrypt_private.h" |
6b3bd08f | 16 | |
6b3bd08f | 17 | /** |
53fd7550 EB |
18 | * fname_crypt_complete() - completion callback for filename crypto |
19 | * @req: The asynchronous cipher request context | |
20 | * @res: The result of the cipher operation | |
6b3bd08f | 21 | */ |
53fd7550 | 22 | static void fname_crypt_complete(struct crypto_async_request *req, int res) |
6b3bd08f | 23 | { |
0b81d077 | 24 | struct fscrypt_completion_result *ecr = req->data; |
6b3bd08f JK |
25 | |
26 | if (res == -EINPROGRESS) | |
27 | return; | |
28 | ecr->res = res; | |
29 | complete(&ecr->completion); | |
30 | } | |
31 | ||
6b3bd08f | 32 | /** |
ef1eb3aa | 33 | * fname_encrypt() - encrypt a filename |
6b3bd08f | 34 | * |
ef1eb3aa EB |
35 | * The caller must have allocated sufficient memory for the @oname string. |
36 | * | |
37 | * Return: 0 on success, -errno on failure | |
6b3bd08f | 38 | */ |
0b81d077 JK |
39 | static int fname_encrypt(struct inode *inode, |
40 | const struct qstr *iname, struct fscrypt_str *oname) | |
6b3bd08f | 41 | { |
2731a944 | 42 | struct skcipher_request *req = NULL; |
0b81d077 JK |
43 | DECLARE_FS_COMPLETION_RESULT(ecr); |
44 | struct fscrypt_info *ci = inode->i_crypt_info; | |
2731a944 | 45 | struct crypto_skcipher *tfm = ci->ci_ctfm; |
6b3bd08f | 46 | int res = 0; |
0b81d077 | 47 | char iv[FS_CRYPTO_BLOCK_SIZE]; |
08ae877f | 48 | struct scatterlist sg; |
0b81d077 | 49 | int padding = 4 << (ci->ci_flags & FS_POLICY_FLAGS_PAD_MASK); |
08ae877f EB |
50 | unsigned int lim; |
51 | unsigned int cryptlen; | |
6b3bd08f | 52 | |
0b81d077 | 53 | lim = inode->i_sb->s_cop->max_namelen(inode); |
6b3bd08f JK |
54 | if (iname->len <= 0 || iname->len > lim) |
55 | return -EIO; | |
56 | ||
08ae877f EB |
57 | /* |
58 | * Copy the filename to the output buffer for encrypting in-place and | |
59 | * pad it with the needed number of NUL bytes. | |
60 | */ | |
61 | cryptlen = max_t(unsigned int, iname->len, FS_CRYPTO_BLOCK_SIZE); | |
62 | cryptlen = round_up(cryptlen, padding); | |
63 | cryptlen = min(cryptlen, lim); | |
64 | memcpy(oname->name, iname->name, iname->len); | |
65 | memset(oname->name + iname->len, 0, cryptlen - iname->len); | |
6b3bd08f | 66 | |
08ae877f EB |
67 | /* Initialize the IV */ |
68 | memset(iv, 0, FS_CRYPTO_BLOCK_SIZE); | |
6b3bd08f | 69 | |
08ae877f | 70 | /* Set up the encryption request */ |
2731a944 | 71 | req = skcipher_request_alloc(tfm, GFP_NOFS); |
6b3bd08f JK |
72 | if (!req) { |
73 | printk_ratelimited(KERN_ERR | |
08ae877f | 74 | "%s: skcipher_request_alloc() failed\n", __func__); |
6b3bd08f JK |
75 | return -ENOMEM; |
76 | } | |
2731a944 | 77 | skcipher_request_set_callback(req, |
6b3bd08f | 78 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, |
53fd7550 | 79 | fname_crypt_complete, &ecr); |
08ae877f EB |
80 | sg_init_one(&sg, oname->name, cryptlen); |
81 | skcipher_request_set_crypt(req, &sg, &sg, cryptlen, iv); | |
6b3bd08f | 82 | |
08ae877f | 83 | /* Do the encryption */ |
2731a944 | 84 | res = crypto_skcipher_encrypt(req); |
6b3bd08f | 85 | if (res == -EINPROGRESS || res == -EBUSY) { |
08ae877f | 86 | /* Request is being completed asynchronously; wait for it */ |
6b3bd08f JK |
87 | wait_for_completion(&ecr.completion); |
88 | res = ecr.res; | |
89 | } | |
2731a944 | 90 | skcipher_request_free(req); |
ef1eb3aa | 91 | if (res < 0) { |
6b3bd08f JK |
92 | printk_ratelimited(KERN_ERR |
93 | "%s: Error (error code %d)\n", __func__, res); | |
ef1eb3aa EB |
94 | return res; |
95 | } | |
0b81d077 | 96 | |
08ae877f | 97 | oname->len = cryptlen; |
ef1eb3aa | 98 | return 0; |
6b3bd08f JK |
99 | } |
100 | ||
ef1eb3aa EB |
101 | /** |
102 | * fname_decrypt() - decrypt a filename | |
103 | * | |
104 | * The caller must have allocated sufficient memory for the @oname string. | |
105 | * | |
106 | * Return: 0 on success, -errno on failure | |
6b3bd08f | 107 | */ |
0b81d077 JK |
108 | static int fname_decrypt(struct inode *inode, |
109 | const struct fscrypt_str *iname, | |
110 | struct fscrypt_str *oname) | |
6b3bd08f | 111 | { |
2731a944 | 112 | struct skcipher_request *req = NULL; |
0b81d077 | 113 | DECLARE_FS_COMPLETION_RESULT(ecr); |
6b3bd08f | 114 | struct scatterlist src_sg, dst_sg; |
0b81d077 | 115 | struct fscrypt_info *ci = inode->i_crypt_info; |
2731a944 | 116 | struct crypto_skcipher *tfm = ci->ci_ctfm; |
6b3bd08f | 117 | int res = 0; |
0b81d077 JK |
118 | char iv[FS_CRYPTO_BLOCK_SIZE]; |
119 | unsigned lim; | |
6b3bd08f | 120 | |
0b81d077 | 121 | lim = inode->i_sb->s_cop->max_namelen(inode); |
6b3bd08f JK |
122 | if (iname->len <= 0 || iname->len > lim) |
123 | return -EIO; | |
124 | ||
125 | /* Allocate request */ | |
2731a944 | 126 | req = skcipher_request_alloc(tfm, GFP_NOFS); |
6b3bd08f JK |
127 | if (!req) { |
128 | printk_ratelimited(KERN_ERR | |
129 | "%s: crypto_request_alloc() failed\n", __func__); | |
130 | return -ENOMEM; | |
131 | } | |
2731a944 | 132 | skcipher_request_set_callback(req, |
6b3bd08f | 133 | CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, |
53fd7550 | 134 | fname_crypt_complete, &ecr); |
6b3bd08f JK |
135 | |
136 | /* Initialize IV */ | |
0b81d077 | 137 | memset(iv, 0, FS_CRYPTO_BLOCK_SIZE); |
6b3bd08f JK |
138 | |
139 | /* Create decryption request */ | |
140 | sg_init_one(&src_sg, iname->name, iname->len); | |
141 | sg_init_one(&dst_sg, oname->name, oname->len); | |
2731a944 HX |
142 | skcipher_request_set_crypt(req, &src_sg, &dst_sg, iname->len, iv); |
143 | res = crypto_skcipher_decrypt(req); | |
6b3bd08f | 144 | if (res == -EINPROGRESS || res == -EBUSY) { |
6b3bd08f JK |
145 | wait_for_completion(&ecr.completion); |
146 | res = ecr.res; | |
147 | } | |
2731a944 | 148 | skcipher_request_free(req); |
6b3bd08f JK |
149 | if (res < 0) { |
150 | printk_ratelimited(KERN_ERR | |
0b81d077 | 151 | "%s: Error (error code %d)\n", __func__, res); |
6b3bd08f JK |
152 | return res; |
153 | } | |
154 | ||
155 | oname->len = strnlen(oname->name, iname->len); | |
ef1eb3aa | 156 | return 0; |
6b3bd08f JK |
157 | } |
158 | ||
159 | static const char *lookup_table = | |
160 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,"; | |
161 | ||
17159420 EB |
162 | #define BASE64_CHARS(nbytes) DIV_ROUND_UP((nbytes) * 4, 3) |
163 | ||
6b3bd08f | 164 | /** |
0b81d077 | 165 | * digest_encode() - |
6b3bd08f JK |
166 | * |
167 | * Encodes the input digest using characters from the set [a-zA-Z0-9_+]. | |
168 | * The encoded string is roughly 4/3 times the size of the input string. | |
169 | */ | |
170 | static int digest_encode(const char *src, int len, char *dst) | |
171 | { | |
172 | int i = 0, bits = 0, ac = 0; | |
173 | char *cp = dst; | |
174 | ||
175 | while (i < len) { | |
176 | ac += (((unsigned char) src[i]) << bits); | |
177 | bits += 8; | |
178 | do { | |
179 | *cp++ = lookup_table[ac & 0x3f]; | |
180 | ac >>= 6; | |
181 | bits -= 6; | |
182 | } while (bits >= 6); | |
183 | i++; | |
184 | } | |
185 | if (bits) | |
186 | *cp++ = lookup_table[ac & 0x3f]; | |
187 | return cp - dst; | |
188 | } | |
189 | ||
190 | static int digest_decode(const char *src, int len, char *dst) | |
191 | { | |
192 | int i = 0, bits = 0, ac = 0; | |
193 | const char *p; | |
194 | char *cp = dst; | |
195 | ||
196 | while (i < len) { | |
197 | p = strchr(lookup_table, src[i]); | |
198 | if (p == NULL || src[i] == 0) | |
199 | return -2; | |
200 | ac += (p - lookup_table) << bits; | |
201 | bits += 6; | |
202 | if (bits >= 8) { | |
203 | *cp++ = ac & 0xff; | |
204 | ac >>= 8; | |
205 | bits -= 8; | |
206 | } | |
207 | i++; | |
208 | } | |
209 | if (ac) | |
210 | return -1; | |
211 | return cp - dst; | |
212 | } | |
213 | ||
0b93e1b9 | 214 | u32 fscrypt_fname_encrypted_size(const struct inode *inode, u32 ilen) |
6b3bd08f | 215 | { |
922ec355 | 216 | int padding = 32; |
0b81d077 | 217 | struct fscrypt_info *ci = inode->i_crypt_info; |
922ec355 CY |
218 | |
219 | if (ci) | |
0b81d077 | 220 | padding = 4 << (ci->ci_flags & FS_POLICY_FLAGS_PAD_MASK); |
55be3145 EB |
221 | ilen = max(ilen, (u32)FS_CRYPTO_BLOCK_SIZE); |
222 | return round_up(ilen, padding); | |
6b3bd08f | 223 | } |
0b81d077 | 224 | EXPORT_SYMBOL(fscrypt_fname_encrypted_size); |
6b3bd08f JK |
225 | |
226 | /** | |
0b81d077 | 227 | * fscrypt_fname_crypto_alloc_obuff() - |
6b3bd08f JK |
228 | * |
229 | * Allocates an output buffer that is sufficient for the crypto operation | |
230 | * specified by the context and the direction. | |
231 | */ | |
0b93e1b9 | 232 | int fscrypt_fname_alloc_buffer(const struct inode *inode, |
0b81d077 | 233 | u32 ilen, struct fscrypt_str *crypto_str) |
6b3bd08f | 234 | { |
17159420 EB |
235 | u32 olen = fscrypt_fname_encrypted_size(inode, ilen); |
236 | const u32 max_encoded_len = | |
237 | max_t(u32, BASE64_CHARS(FSCRYPT_FNAME_MAX_UNDIGESTED_SIZE), | |
238 | 1 + BASE64_CHARS(sizeof(struct fscrypt_digested_name))); | |
6b3bd08f | 239 | |
6b3bd08f | 240 | crypto_str->len = olen; |
17159420 EB |
241 | olen = max(olen, max_encoded_len); |
242 | ||
0b81d077 JK |
243 | /* |
244 | * Allocated buffer can hold one more character to null-terminate the | |
245 | * string | |
246 | */ | |
6b3bd08f JK |
247 | crypto_str->name = kmalloc(olen + 1, GFP_NOFS); |
248 | if (!(crypto_str->name)) | |
249 | return -ENOMEM; | |
250 | return 0; | |
251 | } | |
0b81d077 | 252 | EXPORT_SYMBOL(fscrypt_fname_alloc_buffer); |
6b3bd08f JK |
253 | |
254 | /** | |
0b81d077 | 255 | * fscrypt_fname_crypto_free_buffer() - |
6b3bd08f JK |
256 | * |
257 | * Frees the buffer allocated for crypto operation. | |
258 | */ | |
0b81d077 | 259 | void fscrypt_fname_free_buffer(struct fscrypt_str *crypto_str) |
6b3bd08f JK |
260 | { |
261 | if (!crypto_str) | |
262 | return; | |
263 | kfree(crypto_str->name); | |
264 | crypto_str->name = NULL; | |
265 | } | |
0b81d077 | 266 | EXPORT_SYMBOL(fscrypt_fname_free_buffer); |
6b3bd08f JK |
267 | |
268 | /** | |
0b81d077 JK |
269 | * fscrypt_fname_disk_to_usr() - converts a filename from disk space to user |
270 | * space | |
ef1eb3aa EB |
271 | * |
272 | * The caller must have allocated sufficient memory for the @oname string. | |
273 | * | |
17159420 EB |
274 | * If the key is available, we'll decrypt the disk name; otherwise, we'll encode |
275 | * it for presentation. Short names are directly base64-encoded, while long | |
276 | * names are encoded in fscrypt_digested_name format. | |
277 | * | |
ef1eb3aa | 278 | * Return: 0 on success, -errno on failure |
6b3bd08f | 279 | */ |
0b81d077 JK |
280 | int fscrypt_fname_disk_to_usr(struct inode *inode, |
281 | u32 hash, u32 minor_hash, | |
282 | const struct fscrypt_str *iname, | |
283 | struct fscrypt_str *oname) | |
6b3bd08f JK |
284 | { |
285 | const struct qstr qname = FSTR_TO_QSTR(iname); | |
17159420 | 286 | struct fscrypt_digested_name digested_name; |
6b3bd08f | 287 | |
0b81d077 | 288 | if (fscrypt_is_dot_dotdot(&qname)) { |
6b3bd08f JK |
289 | oname->name[0] = '.'; |
290 | oname->name[iname->len - 1] = '.'; | |
291 | oname->len = iname->len; | |
ef1eb3aa | 292 | return 0; |
6b3bd08f JK |
293 | } |
294 | ||
0b81d077 | 295 | if (iname->len < FS_CRYPTO_BLOCK_SIZE) |
1dafa51d | 296 | return -EUCLEAN; |
6b3bd08f | 297 | |
0b81d077 JK |
298 | if (inode->i_crypt_info) |
299 | return fname_decrypt(inode, iname, oname); | |
300 | ||
17159420 | 301 | if (iname->len <= FSCRYPT_FNAME_MAX_UNDIGESTED_SIZE) { |
ef1eb3aa EB |
302 | oname->len = digest_encode(iname->name, iname->len, |
303 | oname->name); | |
304 | return 0; | |
6b3bd08f JK |
305 | } |
306 | if (hash) { | |
17159420 EB |
307 | digested_name.hash = hash; |
308 | digested_name.minor_hash = minor_hash; | |
0b81d077 | 309 | } else { |
17159420 EB |
310 | digested_name.hash = 0; |
311 | digested_name.minor_hash = 0; | |
0b81d077 | 312 | } |
17159420 EB |
313 | memcpy(digested_name.digest, |
314 | FSCRYPT_FNAME_DIGEST(iname->name, iname->len), | |
315 | FSCRYPT_FNAME_DIGEST_SIZE); | |
6b3bd08f | 316 | oname->name[0] = '_'; |
17159420 EB |
317 | oname->len = 1 + digest_encode((const char *)&digested_name, |
318 | sizeof(digested_name), oname->name + 1); | |
ef1eb3aa | 319 | return 0; |
6b3bd08f | 320 | } |
0b81d077 | 321 | EXPORT_SYMBOL(fscrypt_fname_disk_to_usr); |
6b3bd08f JK |
322 | |
323 | /** | |
0b81d077 JK |
324 | * fscrypt_fname_usr_to_disk() - converts a filename from user space to disk |
325 | * space | |
ef1eb3aa EB |
326 | * |
327 | * The caller must have allocated sufficient memory for the @oname string. | |
328 | * | |
329 | * Return: 0 on success, -errno on failure | |
6b3bd08f | 330 | */ |
0b81d077 | 331 | int fscrypt_fname_usr_to_disk(struct inode *inode, |
6b3bd08f | 332 | const struct qstr *iname, |
0b81d077 | 333 | struct fscrypt_str *oname) |
6b3bd08f | 334 | { |
0b81d077 | 335 | if (fscrypt_is_dot_dotdot(iname)) { |
6b3bd08f JK |
336 | oname->name[0] = '.'; |
337 | oname->name[iname->len - 1] = '.'; | |
338 | oname->len = iname->len; | |
ef1eb3aa | 339 | return 0; |
6b3bd08f | 340 | } |
0b81d077 JK |
341 | if (inode->i_crypt_info) |
342 | return fname_encrypt(inode, iname, oname); | |
343 | /* | |
344 | * Without a proper key, a user is not allowed to modify the filenames | |
6b3bd08f | 345 | * in a directory. Consequently, a user space name cannot be mapped to |
0b81d077 JK |
346 | * a disk-space name |
347 | */ | |
54475f53 | 348 | return -ENOKEY; |
6b3bd08f | 349 | } |
0b81d077 | 350 | EXPORT_SYMBOL(fscrypt_fname_usr_to_disk); |
6b3bd08f | 351 | |
17159420 EB |
352 | /** |
353 | * fscrypt_setup_filename() - prepare to search a possibly encrypted directory | |
354 | * @dir: the directory that will be searched | |
355 | * @iname: the user-provided filename being searched for | |
356 | * @lookup: 1 if we're allowed to proceed without the key because it's | |
357 | * ->lookup() or we're finding the dir_entry for deletion; 0 if we cannot | |
358 | * proceed without the key because we're going to create the dir_entry. | |
359 | * @fname: the filename information to be filled in | |
360 | * | |
361 | * Given a user-provided filename @iname, this function sets @fname->disk_name | |
362 | * to the name that would be stored in the on-disk directory entry, if possible. | |
363 | * If the directory is unencrypted this is simply @iname. Else, if we have the | |
364 | * directory's encryption key, then @iname is the plaintext, so we encrypt it to | |
365 | * get the disk_name. | |
366 | * | |
367 | * Else, for keyless @lookup operations, @iname is the presented ciphertext, so | |
368 | * we decode it to get either the ciphertext disk_name (for short names) or the | |
369 | * fscrypt_digested_name (for long names). Non-@lookup operations will be | |
370 | * impossible in this case, so we fail them with ENOKEY. | |
371 | * | |
372 | * If successful, fscrypt_free_filename() must be called later to clean up. | |
373 | * | |
374 | * Return: 0 on success, -errno on failure | |
375 | */ | |
0b81d077 JK |
376 | int fscrypt_setup_filename(struct inode *dir, const struct qstr *iname, |
377 | int lookup, struct fscrypt_name *fname) | |
6b3bd08f | 378 | { |
17159420 EB |
379 | int ret; |
380 | int digested; | |
6b3bd08f | 381 | |
0b81d077 | 382 | memset(fname, 0, sizeof(struct fscrypt_name)); |
6b3bd08f JK |
383 | fname->usr_fname = iname; |
384 | ||
0b81d077 JK |
385 | if (!dir->i_sb->s_cop->is_encrypted(dir) || |
386 | fscrypt_is_dot_dotdot(iname)) { | |
6b3bd08f JK |
387 | fname->disk_name.name = (unsigned char *)iname->name; |
388 | fname->disk_name.len = iname->len; | |
7bf4b557 | 389 | return 0; |
6b3bd08f | 390 | } |
1b53cf98 | 391 | ret = fscrypt_get_encryption_info(dir); |
0b81d077 | 392 | if (ret && ret != -EOPNOTSUPP) |
6b3bd08f | 393 | return ret; |
0b81d077 JK |
394 | |
395 | if (dir->i_crypt_info) { | |
396 | ret = fscrypt_fname_alloc_buffer(dir, iname->len, | |
397 | &fname->crypto_buf); | |
ef1eb3aa | 398 | if (ret) |
7bf4b557 | 399 | return ret; |
0b81d077 | 400 | ret = fname_encrypt(dir, iname, &fname->crypto_buf); |
ef1eb3aa | 401 | if (ret) |
e5e0906b | 402 | goto errout; |
6b3bd08f JK |
403 | fname->disk_name.name = fname->crypto_buf.name; |
404 | fname->disk_name.len = fname->crypto_buf.len; | |
7bf4b557 | 405 | return 0; |
6b3bd08f | 406 | } |
e5e0906b | 407 | if (!lookup) |
54475f53 | 408 | return -ENOKEY; |
6b3bd08f | 409 | |
0b81d077 JK |
410 | /* |
411 | * We don't have the key and we are doing a lookup; decode the | |
6b3bd08f JK |
412 | * user-supplied name |
413 | */ | |
17159420 EB |
414 | if (iname->name[0] == '_') { |
415 | if (iname->len != | |
416 | 1 + BASE64_CHARS(sizeof(struct fscrypt_digested_name))) | |
417 | return -ENOENT; | |
418 | digested = 1; | |
419 | } else { | |
420 | if (iname->len > | |
421 | BASE64_CHARS(FSCRYPT_FNAME_MAX_UNDIGESTED_SIZE)) | |
422 | return -ENOENT; | |
423 | digested = 0; | |
424 | } | |
e5e0906b | 425 | |
17159420 EB |
426 | fname->crypto_buf.name = |
427 | kmalloc(max_t(size_t, FSCRYPT_FNAME_MAX_UNDIGESTED_SIZE, | |
428 | sizeof(struct fscrypt_digested_name)), | |
429 | GFP_KERNEL); | |
e5e0906b JK |
430 | if (fname->crypto_buf.name == NULL) |
431 | return -ENOMEM; | |
0b81d077 | 432 | |
17159420 | 433 | ret = digest_decode(iname->name + digested, iname->len - digested, |
6b3bd08f JK |
434 | fname->crypto_buf.name); |
435 | if (ret < 0) { | |
436 | ret = -ENOENT; | |
e5e0906b | 437 | goto errout; |
6b3bd08f JK |
438 | } |
439 | fname->crypto_buf.len = ret; | |
17159420 EB |
440 | if (digested) { |
441 | const struct fscrypt_digested_name *n = | |
442 | (const void *)fname->crypto_buf.name; | |
443 | fname->hash = n->hash; | |
444 | fname->minor_hash = n->minor_hash; | |
6b3bd08f JK |
445 | } else { |
446 | fname->disk_name.name = fname->crypto_buf.name; | |
447 | fname->disk_name.len = fname->crypto_buf.len; | |
448 | } | |
7bf4b557 | 449 | return 0; |
0b81d077 | 450 | |
e5e0906b | 451 | errout: |
0b81d077 | 452 | fscrypt_fname_free_buffer(&fname->crypto_buf); |
6b3bd08f JK |
453 | return ret; |
454 | } | |
0b81d077 | 455 | EXPORT_SYMBOL(fscrypt_setup_filename); |
6b3bd08f | 456 | |
0b81d077 | 457 | void fscrypt_free_filename(struct fscrypt_name *fname) |
6b3bd08f JK |
458 | { |
459 | kfree(fname->crypto_buf.name); | |
460 | fname->crypto_buf.name = NULL; | |
461 | fname->usr_fname = NULL; | |
462 | fname->disk_name.name = NULL; | |
463 | } | |
0b81d077 | 464 | EXPORT_SYMBOL(fscrypt_free_filename); |