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affs_lookup: switch to d_splice_alias()

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Making something exportable takes more than providing ->s_export_ops.
In particular, ->lookup() *MUST* use d_splice_alias() instead of
d_add().

Reading Documentation/filesystems/nfs/Exporting would've been a good idea;
as it is, exporting AFFS is badly (and exploitably) broken.

Partially-Fixes: ed4433d723 "fs/affs: make affs exportable"
Acked-by: David Sterba <dsterba@suse.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-05-06 12:20:40 -04:00
parent 30da870ce4
commit 87fbd639c0
1 changed files with 5 additions and 6 deletions
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11
fs/affs/namei.c
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@ -201,6 +201,7 @@ affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
struct super_block *sb = dir->i_sb; struct super_block *sb = dir->i_sb;
struct buffer_head *bh; struct buffer_head *bh;
struct inode *inode = NULL; struct inode *inode = NULL;
struct dentry *res;
pr_debug("%s(\"%pd\")\n", __func__, dentry); pr_debug("%s(\"%pd\")\n", __func__, dentry);
@ -223,14 +224,12 @@ affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
} }
affs_brelse(bh); affs_brelse(bh);
inode = affs_iget(sb, ino); inode = affs_iget(sb, ino);
if (IS_ERR(inode)) {
affs_unlock_dir(dir);
return ERR_CAST(inode);
}
} }
d_add(dentry, inode); res = d_splice_alias(inode, dentry);
if (!IS_ERR_OR_NULL(res))
res->d_fsdata = dentry->d_fsdata;
affs_unlock_dir(dir); affs_unlock_dir(dir);
return NULL; return res;
} }
int int