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f2fs: switch to fscrypt_get_symlink()

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Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Eric Biggers
2018-01-11 23:26:49 -05:00
committed by Jaegeuk Kim
parent 6b76f58e24
commit 7ac4756a24
1 changed files with 11 additions and 55 deletions
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66
fs/f2fs/namei.c
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@@ -1093,65 +1093,21 @@ static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
{
struct page *cpage = NULL;
char *caddr, *paddr = NULL;
struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
struct fscrypt_symlink_data *sd;
struct inode *inode = d_inode(dentry);
u32 max_size = inode->i_sb->s_blocksize;
int res;
struct page *page;
void *target;
res = fscrypt_get_encryption_info(inode);
if (res)
return ERR_PTR(res);
if (!dentry)
return ERR_PTR(-ECHILD);
cpage = read_mapping_page(inode->i_mapping, 0, NULL);
if (IS_ERR(cpage))
return ERR_CAST(cpage);
caddr = page_address(cpage);
page = read_mapping_page(inode->i_mapping, 0, NULL);
if (IS_ERR(page))
return ERR_CAST(page);
/* Symlink is encrypted */
sd = (struct fscrypt_symlink_data *)caddr;
cstr.name = sd->encrypted_path;
cstr.len = le16_to_cpu(sd->len);
/* this is broken symlink case */
if (unlikely(cstr.len == 0)) {
res = -ENOENT;
goto errout;
}
if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
/* Symlink data on the disk is corrupted */
res = -EIO;
goto errout;
}
res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
if (res)
goto errout;
res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
if (res)
goto errout;
/* this is broken symlink case */
if (unlikely(pstr.name[0] == 0)) {
res = -ENOENT;
goto errout;
}
paddr = pstr.name;
/* Null-terminate the name */
paddr[pstr.len] = '\0';
put_page(cpage);
return *cookie = paddr;
errout:
fscrypt_fname_free_buffer(&pstr);
put_page(cpage);
return ERR_PTR(res);
target = fscrypt_get_symlink(inode, page_address(page),
inode->i_sb->s_blocksize);
put_page(page);
return *cookie = target;
}
const struct inode_operations f2fs_encrypted_symlink_inode_operations = {