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fuse: readdirplus: fix dentry leak

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In case d_lookup() returns a dentry with d_inode == NULL, the dentry is not
returned with dput(). This results in triggering a BUG() in
shrink_dcache_for_umount_subtree():

  BUG: Dentry ...{i=0,n=...} still in use (1) [unmount of fuse fuse]

[SzM: need to d_drop() as well]

Reported-by: Justin Clift <jclift@redhat.com>
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Tested-by: Brian Foster <bfoster@redhat.com>
Tested-by: Niels de Vos <ndevos@redhat.com>
CC: stable@vger.kernel.org
This commit is contained in:
Niels de Vos 2013-07-17 14:53:53 +02:00 committed by Miklos Szeredi
parent ad81f0545e
commit 53ce9a3364
1 changed files with 8 additions and 5 deletions
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13
fs/fuse/dir.c
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@ -1227,9 +1227,15 @@ static int fuse_direntplus_link(struct file *file,
name.hash = full_name_hash(name.name, name.len);
dentry = d_lookup(parent, &name);
if (dentry && dentry->d_inode) {
if (dentry) {
inode = dentry->d_inode;
if (get_node_id(inode) == o->nodeid) {
if (!inode) {
d_drop(dentry);
} else if (get_node_id(inode) != o->nodeid) {
err = d_invalidate(dentry);
if (err)
goto out;
} else {
struct fuse_inode *fi;
fi = get_fuse_inode(inode);
spin_lock(&fc->lock);
@ -1242,9 +1248,6 @@ static int fuse_direntplus_link(struct file *file,
*/
goto found;
}
err = d_invalidate(dentry);
if (err)
goto out;
dput(dentry);
dentry = NULL;
}