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authorAl Viro <viro@zeniv.linux.org.uk>2018-05-06 12:20:40 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2018-05-21 14:29:12 -0400
commit87fbd639c02ec96d67738e40b6521fb070ed7168 (patch)
treea11ad3f7b598cddf1a18236ed13f4a86d16e288e /fs
parent30da870ce4a4e007c901858a96e9e394a1daa74a (diff)
downloadlinux-87fbd639c02ec96d67738e40b6521fb070ed7168.tar.bz2
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: ed4433d72394 "fs/affs: make affs exportable" Acked-by: David Sterba <dsterba@suse.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/affs/namei.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/fs/affs/namei.c b/fs/affs/namei.c
index 1ed0fa4c4d48..41c5749f4db7 100644
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
@@ -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