Commit 87fbd639 authored by Al Viro's avatar Al Viro

affs_lookup: switch to d_splice_alias()

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: ed4433d7 "fs/affs: make affs exportable"
Acked-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 30da870c
......@@ -201,6 +201,7 @@ affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
struct super_block *sb = dir->i_sb;
struct buffer_head *bh;
struct inode *inode = NULL;
struct dentry *res;
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);
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);
return NULL;
return res;
}
int
......
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