ext4 crypto: simplify and speed up filename encryption
Avoid using SHA-1 when calculating the user-visible filename when the encryption key is available, and avoid decrypting lots of filenames when searching for a directory entry in a directory block. Change-Id: If4655f144784978ba0305b597bfa1c8d7bb69e63 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
parent
6ddb244784
commit
5de0b4d0cd
|
@ -198,106 +198,57 @@ static int ext4_fname_decrypt(struct ext4_fname_crypto_ctx *ctx,
|
|||
return oname->len;
|
||||
}
|
||||
|
||||
static const char *lookup_table =
|
||||
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
|
||||
|
||||
/**
|
||||
* ext4_fname_encode_digest() -
|
||||
*
|
||||
* Encodes the input digest using characters from the set [a-zA-Z0-9_+].
|
||||
* The encoded string is roughly 4/3 times the size of the input string.
|
||||
*/
|
||||
int ext4_fname_encode_digest(char *dst, char *src, u32 len)
|
||||
static int digest_encode(const char *src, int len, char *dst)
|
||||
{
|
||||
static const char *lookup_table =
|
||||
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_+";
|
||||
u32 current_chunk, num_chunks, i;
|
||||
char tmp_buf[3];
|
||||
u32 c0, c1, c2, c3;
|
||||
int i = 0, bits = 0, ac = 0;
|
||||
char *cp = dst;
|
||||
|
||||
current_chunk = 0;
|
||||
num_chunks = len/3;
|
||||
for (i = 0; i < num_chunks; i++) {
|
||||
c0 = src[3*i] & 0x3f;
|
||||
c1 = (((src[3*i]>>6)&0x3) | ((src[3*i+1] & 0xf)<<2)) & 0x3f;
|
||||
c2 = (((src[3*i+1]>>4)&0xf) | ((src[3*i+2] & 0x3)<<4)) & 0x3f;
|
||||
c3 = (src[3*i+2]>>2) & 0x3f;
|
||||
dst[4*i] = lookup_table[c0];
|
||||
dst[4*i+1] = lookup_table[c1];
|
||||
dst[4*i+2] = lookup_table[c2];
|
||||
dst[4*i+3] = lookup_table[c3];
|
||||
}
|
||||
if (i*3 < len) {
|
||||
memset(tmp_buf, 0, 3);
|
||||
memcpy(tmp_buf, &src[3*i], len-3*i);
|
||||
c0 = tmp_buf[0] & 0x3f;
|
||||
c1 = (((tmp_buf[0]>>6)&0x3) | ((tmp_buf[1] & 0xf)<<2)) & 0x3f;
|
||||
c2 = (((tmp_buf[1]>>4)&0xf) | ((tmp_buf[2] & 0x3)<<4)) & 0x3f;
|
||||
c3 = (tmp_buf[2]>>2) & 0x3f;
|
||||
dst[4*i] = lookup_table[c0];
|
||||
dst[4*i+1] = lookup_table[c1];
|
||||
dst[4*i+2] = lookup_table[c2];
|
||||
dst[4*i+3] = lookup_table[c3];
|
||||
while (i < len) {
|
||||
ac += (((unsigned char) src[i]) << bits);
|
||||
bits += 8;
|
||||
do {
|
||||
*cp++ = lookup_table[ac & 0x3f];
|
||||
ac >>= 6;
|
||||
bits -= 6;
|
||||
} while (bits >= 6);
|
||||
i++;
|
||||
}
|
||||
return (i * 4);
|
||||
if (bits)
|
||||
*cp++ = lookup_table[ac & 0x3f];
|
||||
return cp - dst;
|
||||
}
|
||||
|
||||
/**
|
||||
* ext4_fname_hash() -
|
||||
*
|
||||
* This function computes the hash of the input filename, and sets the output
|
||||
* buffer to the *encoded* digest. It returns the length of the digest as its
|
||||
* return value. Errors are returned as negative numbers. We trust the caller
|
||||
* to allocate sufficient memory to oname string.
|
||||
*/
|
||||
static int ext4_fname_hash(struct ext4_fname_crypto_ctx *ctx,
|
||||
const struct ext4_str *iname,
|
||||
struct ext4_str *oname)
|
||||
static int digest_decode(const char *src, int len, char *dst)
|
||||
{
|
||||
struct scatterlist sg;
|
||||
struct hash_desc desc = {
|
||||
.tfm = (struct crypto_hash *)ctx->htfm,
|
||||
.flags = CRYPTO_TFM_REQ_MAY_SLEEP
|
||||
};
|
||||
int res = 0;
|
||||
int i = 0, bits = 0, ac = 0;
|
||||
const char *p;
|
||||
char *cp = dst;
|
||||
|
||||
if (iname->len <= EXT4_FNAME_CRYPTO_DIGEST_SIZE) {
|
||||
res = ext4_fname_encode_digest(oname->name, iname->name,
|
||||
iname->len);
|
||||
oname->len = res;
|
||||
return res;
|
||||
while (i < len) {
|
||||
p = strchr(lookup_table, src[i]);
|
||||
if (p == NULL || src[i] == 0)
|
||||
return -2;
|
||||
ac += (p - lookup_table) << bits;
|
||||
bits += 6;
|
||||
if (bits >= 8) {
|
||||
*cp++ = ac & 0xff;
|
||||
ac >>= 8;
|
||||
bits -= 8;
|
||||
}
|
||||
i++;
|
||||
}
|
||||
|
||||
sg_init_one(&sg, iname->name, iname->len);
|
||||
res = crypto_hash_init(&desc);
|
||||
if (res) {
|
||||
printk(KERN_ERR
|
||||
"%s: Error initializing crypto hash; res = [%d]\n",
|
||||
__func__, res);
|
||||
goto out;
|
||||
}
|
||||
res = crypto_hash_update(&desc, &sg, iname->len);
|
||||
if (res) {
|
||||
printk(KERN_ERR
|
||||
"%s: Error updating crypto hash; res = [%d]\n",
|
||||
__func__, res);
|
||||
goto out;
|
||||
}
|
||||
res = crypto_hash_final(&desc,
|
||||
&oname->name[EXT4_FNAME_CRYPTO_DIGEST_SIZE]);
|
||||
if (res) {
|
||||
printk(KERN_ERR
|
||||
"%s: Error finalizing crypto hash; res = [%d]\n",
|
||||
__func__, res);
|
||||
goto out;
|
||||
}
|
||||
/* Encode the digest as a printable string--this will increase the
|
||||
* size of the digest */
|
||||
oname->name[0] = 'I';
|
||||
res = ext4_fname_encode_digest(oname->name+1,
|
||||
&oname->name[EXT4_FNAME_CRYPTO_DIGEST_SIZE],
|
||||
EXT4_FNAME_CRYPTO_DIGEST_SIZE) + 1;
|
||||
oname->len = res;
|
||||
out:
|
||||
return res;
|
||||
if (ac)
|
||||
return -1;
|
||||
return cp - dst;
|
||||
}
|
||||
|
||||
/**
|
||||
|
@ -571,9 +522,13 @@ void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str)
|
|||
* ext4_fname_disk_to_usr() - converts a filename from disk space to user space
|
||||
*/
|
||||
int _ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx,
|
||||
const struct ext4_str *iname,
|
||||
struct ext4_str *oname)
|
||||
struct dx_hash_info *hinfo,
|
||||
const struct ext4_str *iname,
|
||||
struct ext4_str *oname)
|
||||
{
|
||||
char buf[24];
|
||||
int ret;
|
||||
|
||||
if (ctx == NULL)
|
||||
return -EIO;
|
||||
if (iname->len < 3) {
|
||||
|
@ -587,18 +542,33 @@ int _ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx,
|
|||
}
|
||||
if (ctx->has_valid_key)
|
||||
return ext4_fname_decrypt(ctx, iname, oname);
|
||||
else
|
||||
return ext4_fname_hash(ctx, iname, oname);
|
||||
|
||||
if (iname->len <= EXT4_FNAME_CRYPTO_DIGEST_SIZE) {
|
||||
ret = digest_encode(iname->name, iname->len, oname->name);
|
||||
oname->len = ret;
|
||||
return ret;
|
||||
}
|
||||
if (hinfo) {
|
||||
memcpy(buf, &hinfo->hash, 4);
|
||||
memcpy(buf+4, &hinfo->minor_hash, 4);
|
||||
} else
|
||||
memset(buf, 0, 8);
|
||||
memcpy(buf + 8, iname->name + iname->len - 16, 16);
|
||||
oname->name[0] = '_';
|
||||
ret = digest_encode(buf, 24, oname->name+1);
|
||||
oname->len = ret + 1;
|
||||
return ret + 1;
|
||||
}
|
||||
|
||||
int ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx,
|
||||
struct dx_hash_info *hinfo,
|
||||
const struct ext4_dir_entry_2 *de,
|
||||
struct ext4_str *oname)
|
||||
{
|
||||
struct ext4_str iname = {.name = (unsigned char *) de->name,
|
||||
.len = de->name_len };
|
||||
|
||||
return _ext4_fname_disk_to_usr(ctx, &iname, oname);
|
||||
return _ext4_fname_disk_to_usr(ctx, hinfo, &iname, oname);
|
||||
}
|
||||
|
||||
|
||||
|
@ -640,10 +610,11 @@ int ext4_fname_usr_to_hash(struct ext4_fname_crypto_ctx *ctx,
|
|||
const struct qstr *iname,
|
||||
struct dx_hash_info *hinfo)
|
||||
{
|
||||
struct ext4_str tmp, tmp2;
|
||||
struct ext4_str tmp;
|
||||
int ret = 0;
|
||||
char buf[EXT4_FNAME_CRYPTO_DIGEST_SIZE+1];
|
||||
|
||||
if (!ctx || !ctx->has_valid_key ||
|
||||
if (!ctx ||
|
||||
((iname->name[0] == '.') &&
|
||||
((iname->len == 1) ||
|
||||
((iname->name[1] == '.') && (iname->len == 2))))) {
|
||||
|
@ -651,59 +622,90 @@ int ext4_fname_usr_to_hash(struct ext4_fname_crypto_ctx *ctx,
|
|||
return 0;
|
||||
}
|
||||
|
||||
if (!ctx->has_valid_key && iname->name[0] == '_') {
|
||||
if (iname->len != 33)
|
||||
return -ENOENT;
|
||||
ret = digest_decode(iname->name+1, iname->len, buf);
|
||||
if (ret != 24)
|
||||
return -ENOENT;
|
||||
memcpy(&hinfo->hash, buf, 4);
|
||||
memcpy(&hinfo->minor_hash, buf + 4, 4);
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (!ctx->has_valid_key && iname->name[0] != '_') {
|
||||
if (iname->len > 43)
|
||||
return -ENOENT;
|
||||
ret = digest_decode(iname->name, iname->len, buf);
|
||||
ext4fs_dirhash(buf, ret, hinfo);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* First encrypt the plaintext name */
|
||||
ret = ext4_fname_crypto_alloc_buffer(ctx, iname->len, &tmp);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = ext4_fname_encrypt(ctx, iname, &tmp);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
tmp2.len = (4 * ((EXT4_FNAME_CRYPTO_DIGEST_SIZE + 2) / 3)) + 1;
|
||||
tmp2.name = kmalloc(tmp2.len + 1, GFP_KERNEL);
|
||||
if (tmp2.name == NULL) {
|
||||
ret = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
ret = ext4_fname_hash(ctx, &tmp, &tmp2);
|
||||
if (ret > 0)
|
||||
ext4fs_dirhash(tmp2.name, tmp2.len, hinfo);
|
||||
ext4_fname_crypto_free_buffer(&tmp2);
|
||||
out:
|
||||
ext4_fname_crypto_free_buffer(&tmp);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* ext4_fname_disk_to_htree() - converts a filename from disk space to htree-access string
|
||||
*/
|
||||
int ext4_fname_disk_to_hash(struct ext4_fname_crypto_ctx *ctx,
|
||||
const struct ext4_dir_entry_2 *de,
|
||||
struct dx_hash_info *hinfo)
|
||||
{
|
||||
struct ext4_str iname = {.name = (unsigned char *) de->name,
|
||||
.len = de->name_len};
|
||||
struct ext4_str tmp;
|
||||
int ret;
|
||||
|
||||
if (!ctx ||
|
||||
((iname.name[0] == '.') &&
|
||||
((iname.len == 1) ||
|
||||
((iname.name[1] == '.') && (iname.len == 2))))) {
|
||||
ext4fs_dirhash(iname.name, iname.len, hinfo);
|
||||
return 0;
|
||||
}
|
||||
|
||||
tmp.len = (4 * ((EXT4_FNAME_CRYPTO_DIGEST_SIZE + 2) / 3)) + 1;
|
||||
tmp.name = kmalloc(tmp.len + 1, GFP_KERNEL);
|
||||
if (tmp.name == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
ret = ext4_fname_hash(ctx, &iname, &tmp);
|
||||
if (ret > 0)
|
||||
if (ret >= 0) {
|
||||
ext4fs_dirhash(tmp.name, tmp.len, hinfo);
|
||||
ret = 0;
|
||||
}
|
||||
|
||||
ext4_fname_crypto_free_buffer(&tmp);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int ext4_fname_match(struct ext4_fname_crypto_ctx *ctx, struct ext4_str *cstr,
|
||||
int len, const char * const name,
|
||||
struct ext4_dir_entry_2 *de)
|
||||
{
|
||||
int ret = -ENOENT;
|
||||
int bigname = (*name == '_');
|
||||
|
||||
if (ctx->has_valid_key) {
|
||||
if (cstr->name == NULL) {
|
||||
struct qstr istr;
|
||||
|
||||
ret = ext4_fname_crypto_alloc_buffer(ctx, len, cstr);
|
||||
if (ret < 0)
|
||||
goto errout;
|
||||
istr.name = name;
|
||||
istr.len = len;
|
||||
ret = ext4_fname_encrypt(ctx, &istr, cstr);
|
||||
if (ret < 0)
|
||||
goto errout;
|
||||
}
|
||||
} else {
|
||||
if (cstr->name == NULL) {
|
||||
cstr->name = kmalloc(32, GFP_KERNEL);
|
||||
if (cstr->name == NULL)
|
||||
return -ENOMEM;
|
||||
if ((bigname && (len != 33)) ||
|
||||
(!bigname && (len > 43)))
|
||||
goto errout;
|
||||
ret = digest_decode(name+bigname, len-bigname,
|
||||
cstr->name);
|
||||
if (ret < 0) {
|
||||
ret = -ENOENT;
|
||||
goto errout;
|
||||
}
|
||||
cstr->len = ret;
|
||||
}
|
||||
if (bigname) {
|
||||
if (de->name_len < 16)
|
||||
return 0;
|
||||
ret = memcmp(de->name + de->name_len - 16,
|
||||
cstr->name + 8, 16);
|
||||
return (ret == 0) ? 1 : 0;
|
||||
}
|
||||
}
|
||||
if (de->name_len != cstr->len)
|
||||
return 0;
|
||||
ret = memcmp(de->name, cstr->name, cstr->len);
|
||||
return (ret == 0) ? 1 : 0;
|
||||
errout:
|
||||
kfree(cstr->name);
|
||||
cstr->name = NULL;
|
||||
return ret;
|
||||
}
|
||||
|
|
|
@ -249,7 +249,7 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
|
|||
} else {
|
||||
/* Directory is encrypted */
|
||||
err = ext4_fname_disk_to_usr(enc_ctx,
|
||||
de, &fname_crypto_str);
|
||||
NULL, de, &fname_crypto_str);
|
||||
if (err < 0)
|
||||
goto errout;
|
||||
if (!dir_emit(ctx,
|
||||
|
|
|
@ -2093,9 +2093,11 @@ u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
|
|||
int ext4_fname_crypto_alloc_buffer(struct ext4_fname_crypto_ctx *ctx,
|
||||
u32 ilen, struct ext4_str *crypto_str);
|
||||
int _ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx,
|
||||
struct dx_hash_info *hinfo,
|
||||
const struct ext4_str *iname,
|
||||
struct ext4_str *oname);
|
||||
int ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx,
|
||||
struct dx_hash_info *hinfo,
|
||||
const struct ext4_dir_entry_2 *de,
|
||||
struct ext4_str *oname);
|
||||
int ext4_fname_usr_to_disk(struct ext4_fname_crypto_ctx *ctx,
|
||||
|
@ -2104,11 +2106,12 @@ int ext4_fname_usr_to_disk(struct ext4_fname_crypto_ctx *ctx,
|
|||
int ext4_fname_usr_to_hash(struct ext4_fname_crypto_ctx *ctx,
|
||||
const struct qstr *iname,
|
||||
struct dx_hash_info *hinfo);
|
||||
int ext4_fname_disk_to_hash(struct ext4_fname_crypto_ctx *ctx,
|
||||
const struct ext4_dir_entry_2 *de,
|
||||
struct dx_hash_info *hinfo);
|
||||
int ext4_fname_crypto_namelen_on_disk(struct ext4_fname_crypto_ctx *ctx,
|
||||
u32 namelen);
|
||||
int ext4_fname_match(struct ext4_fname_crypto_ctx *ctx, struct ext4_str *cstr,
|
||||
int len, const char * const name,
|
||||
struct ext4_dir_entry_2 *de);
|
||||
|
||||
|
||||
#ifdef CONFIG_EXT4_FS_ENCRYPTION
|
||||
void ext4_put_fname_crypto_ctx(struct ext4_fname_crypto_ctx **ctx);
|
||||
|
|
|
@ -640,7 +640,7 @@ static struct stats dx_show_leaf(struct inode *dir,
|
|||
ext4_put_fname_crypto_ctx(&ctx);
|
||||
ctx = NULL;
|
||||
}
|
||||
res = ext4_fname_disk_to_usr(ctx, de,
|
||||
res = ext4_fname_disk_to_usr(ctx, NULL, de,
|
||||
&fname_crypto_str);
|
||||
if (res < 0) {
|
||||
printk(KERN_WARNING "Error "
|
||||
|
@ -653,15 +653,8 @@ static struct stats dx_show_leaf(struct inode *dir,
|
|||
name = fname_crypto_str.name;
|
||||
len = fname_crypto_str.len;
|
||||
}
|
||||
res = ext4_fname_disk_to_hash(ctx, de,
|
||||
&h);
|
||||
if (res < 0) {
|
||||
printk(KERN_WARNING "Error "
|
||||
"converting filename "
|
||||
"from disk to htree"
|
||||
"\n");
|
||||
h.hash = 0xDEADBEEF;
|
||||
}
|
||||
ext4fs_dirhash(de->name, de->name_len,
|
||||
&h);
|
||||
printk("%*.s:(E)%x.%u ", len, name,
|
||||
h.hash, (unsigned) ((char *) de
|
||||
- base));
|
||||
|
@ -1008,15 +1001,7 @@ static int htree_dirblock_to_tree(struct file *dir_file,
|
|||
/* silently ignore the rest of the block */
|
||||
break;
|
||||
}
|
||||
#ifdef CONFIG_EXT4_FS_ENCRYPTION
|
||||
err = ext4_fname_disk_to_hash(ctx, de, hinfo);
|
||||
if (err < 0) {
|
||||
count = err;
|
||||
goto errout;
|
||||
}
|
||||
#else
|
||||
ext4fs_dirhash(de->name, de->name_len, hinfo);
|
||||
#endif
|
||||
if ((hinfo->hash < start_hash) ||
|
||||
((hinfo->hash == start_hash) &&
|
||||
(hinfo->minor_hash < start_minor_hash)))
|
||||
|
@ -1032,7 +1017,7 @@ static int htree_dirblock_to_tree(struct file *dir_file,
|
|||
&tmp_str);
|
||||
} else {
|
||||
/* Directory is encrypted */
|
||||
err = ext4_fname_disk_to_usr(ctx, de,
|
||||
err = ext4_fname_disk_to_usr(ctx, hinfo, de,
|
||||
&fname_crypto_str);
|
||||
if (err < 0) {
|
||||
count = err;
|
||||
|
@ -1193,26 +1178,10 @@ static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
|
|||
int count = 0;
|
||||
char *base = (char *) de;
|
||||
struct dx_hash_info h = *hinfo;
|
||||
#ifdef CONFIG_EXT4_FS_ENCRYPTION
|
||||
struct ext4_fname_crypto_ctx *ctx = NULL;
|
||||
int err;
|
||||
|
||||
ctx = ext4_get_fname_crypto_ctx(dir, EXT4_NAME_LEN);
|
||||
if (IS_ERR(ctx))
|
||||
return PTR_ERR(ctx);
|
||||
#endif
|
||||
|
||||
while ((char *) de < base + blocksize) {
|
||||
if (de->name_len && de->inode) {
|
||||
#ifdef CONFIG_EXT4_FS_ENCRYPTION
|
||||
err = ext4_fname_disk_to_hash(ctx, de, &h);
|
||||
if (err < 0) {
|
||||
ext4_put_fname_crypto_ctx(&ctx);
|
||||
return err;
|
||||
}
|
||||
#else
|
||||
ext4fs_dirhash(de->name, de->name_len, &h);
|
||||
#endif
|
||||
map_tail--;
|
||||
map_tail->hash = h.hash;
|
||||
map_tail->offs = ((char *) de - base)>>2;
|
||||
|
@ -1223,9 +1192,6 @@ static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
|
|||
/* XXX: do we need to check rec_len == 0 case? -Chris */
|
||||
de = ext4_next_entry(de, blocksize);
|
||||
}
|
||||
#ifdef CONFIG_EXT4_FS_ENCRYPTION
|
||||
ext4_put_fname_crypto_ctx(&ctx);
|
||||
#endif
|
||||
return count;
|
||||
}
|
||||
|
||||
|
@ -1287,16 +1253,8 @@ static inline int ext4_match(struct ext4_fname_crypto_ctx *ctx,
|
|||
return 0;
|
||||
|
||||
#ifdef CONFIG_EXT4_FS_ENCRYPTION
|
||||
if (ctx) {
|
||||
/* Directory is encrypted */
|
||||
res = ext4_fname_disk_to_usr(ctx, de, fname_crypto_str);
|
||||
if (res < 0)
|
||||
return res;
|
||||
if (len != res)
|
||||
return 0;
|
||||
res = memcmp(name, fname_crypto_str->name, len);
|
||||
return (res == 0) ? 1 : 0;
|
||||
}
|
||||
if (ctx)
|
||||
return ext4_fname_match(ctx, fname_crypto_str, len, name, de);
|
||||
#endif
|
||||
if (len != de->name_len)
|
||||
return 0;
|
||||
|
@ -1324,16 +1282,6 @@ int search_dir(struct buffer_head *bh, char *search_buf, int buf_size,
|
|||
if (IS_ERR(ctx))
|
||||
return -1;
|
||||
|
||||
if (ctx != NULL) {
|
||||
/* Allocate buffer to hold maximum name length */
|
||||
res = ext4_fname_crypto_alloc_buffer(ctx, EXT4_NAME_LEN,
|
||||
&fname_crypto_str);
|
||||
if (res < 0) {
|
||||
ext4_put_fname_crypto_ctx(&ctx);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
de = (struct ext4_dir_entry_2 *)search_buf;
|
||||
dlimit = search_buf + buf_size;
|
||||
while ((char *) de < dlimit) {
|
||||
|
@ -1872,14 +1820,6 @@ int ext4_find_dest_de(struct inode *dir, struct inode *inode,
|
|||
return res;
|
||||
}
|
||||
reclen = EXT4_DIR_REC_LEN(res);
|
||||
|
||||
/* Allocate buffer to hold maximum name length */
|
||||
res = ext4_fname_crypto_alloc_buffer(ctx, EXT4_NAME_LEN,
|
||||
&fname_crypto_str);
|
||||
if (res < 0) {
|
||||
ext4_put_fname_crypto_ctx(&ctx);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
de = (struct ext4_dir_entry_2 *)buf;
|
||||
|
|
|
@ -74,7 +74,7 @@ static void *ext4_follow_link(struct dentry *dentry, struct nameidata *nd)
|
|||
goto errout;
|
||||
}
|
||||
pstr.name = paddr;
|
||||
res = _ext4_fname_disk_to_usr(ctx, &cstr, &pstr);
|
||||
res = _ext4_fname_disk_to_usr(ctx, NULL, &cstr, &pstr);
|
||||
if (res < 0)
|
||||
goto errout;
|
||||
/* Null-terminate the name */
|
||||
|
|
Loading…
Reference in New Issue