From 3c5184ef1216dd476c9c67f22a199d90ac4d5892 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Mon, 9 Jan 2012 16:34:32 -0500 Subject: [PATCH] ceph: d_alloc_root() may fail ... and ceph_init_dentry(NULL) will oops Signed-off-by: Al Viro --- fs/ceph/super.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/fs/ceph/super.c b/fs/ceph/super.c index 11bd0fc4853f..48f61a12af66 100644 --- a/fs/ceph/super.c +++ b/fs/ceph/super.c @@ -636,19 +636,26 @@ static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, req->r_num_caps = 2; err = ceph_mdsc_do_request(mdsc, NULL, req); if (err == 0) { + struct inode *inode = req->r_target_inode; + req->r_target_inode = NULL; dout("open_root_inode success\n"); - if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT && + if (ceph_ino(inode) == CEPH_INO_ROOT && fsc->sb->s_root == NULL) { - root = d_alloc_root(req->r_target_inode); + root = d_alloc_root(inode); + if (!root) { + iput(inode); + root = ERR_PTR(-ENOMEM); + goto out; + } ceph_init_dentry(root); } else { - root = d_obtain_alias(req->r_target_inode); + root = d_obtain_alias(inode); } - req->r_target_inode = NULL; dout("open_root_inode success, root dentry is %p\n", root); } else { root = ERR_PTR(err); } +out: ceph_mdsc_put_request(req); return root; } -- 2.20.1