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ceph: fix use after free on mds __unregister_request 

There was a use after free in __unregister_request that would trigger
whenever the request map held the last reference.  This appears to have
triggered an oops during 'umount -f' when requests are being torn down.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2010-03-28 21:22:50 -07:00
parent 23ab15ad7a
commit 94aa8ae13d
1 changed files with 2 additions and 1 deletions
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3
fs/ceph/mds_client.c
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@ -532,7 +532,6 @@ static void __unregister_request(struct ceph_mds_client *mdsc,
dout("__unregister_request %p tid %lld\n", req, req->r_tid);
rb_erase(&req->r_node, &mdsc->request_tree);
RB_CLEAR_NODE(&req->r_node);
ceph_mdsc_put_request(req);
if (req->r_unsafe_dir) {
struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
@ -541,6 +540,8 @@ static void __unregister_request(struct ceph_mds_client *mdsc,
list_del_init(&req->r_unsafe_dir_item);
spin_unlock(&ci->i_unsafe_lock);
}
ceph_mdsc_put_request(req);
}
/*