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authorJ. Bruce Fields <bfields@redhat.com>2019-08-15 16:18:26 -0400
committerJ. Bruce Fields <bfields@redhat.com>2019-08-15 16:24:07 -0400
commitbebd6997163addc1938db8c61754a23ffdf8ccc4 (patch)
treeede74ed1ac2d974bc81c8cea70bbc2c38bd04694 /fs
parentdc46bba709cfb45e4b2d40cf45aaeacb82690504 (diff)
nfsd: initialize i_private before d_add
A process could race in an open and attempt to read one of these files before i_private is initialized, and get a spurious error. Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfsd/nfsctl.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index b14f825c62fe..3cf4f6aa48d6 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -1171,13 +1171,17 @@ static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
return inode;
}
-static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
{
struct inode *inode;
inode = nfsd_get_inode(dir->i_sb, mode);
if (!inode)
return -ENOMEM;
+ if (ncl) {
+ inode->i_private = ncl;
+ kref_get(&ncl->cl_ref);
+ }
d_add(dentry, inode);
inc_nlink(dir);
fsnotify_mkdir(dir, dentry);
@@ -1194,13 +1198,9 @@ static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *nc
dentry = d_alloc_name(parent, name);
if (!dentry)
goto out_err;
- ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600);
+ ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
if (ret)
goto out_err;
- if (ncl) {
- d_inode(dentry)->i_private = ncl;
- kref_get(&ncl->cl_ref);
- }
out:
inode_unlock(dir);
return dentry;