afs: Fix leak in afs_lookup_cell_rcu()

Fix a leak on the cell refcount in afs_lookup_cell_rcu() due to
non-clearance of the default error in the case a NULL cell name is passed
and the workstation default cell is used.

Also put a bit at the end to make sure we don't leak a cell ref if we're
going to be returning an error.

This leak results in an assertion like the following when the kafs module is
unloaded:

	AFS: Assertion failed
	2 == 1 is false
	0x2 == 0x1 is false
	------------[ cut here ]------------
	kernel BUG at fs/afs/cell.c:770!
	...
	RIP: 0010:afs_manage_cells+0x220/0x42f [kafs]
	...
	 process_one_work+0x4c2/0x82c
	 ? pool_mayday_timeout+0x1e1/0x1e1
	 ? do_raw_spin_lock+0x134/0x175
	 worker_thread+0x336/0x4a6
	 ? rescuer_thread+0x4af/0x4af
	 kthread+0x1de/0x1ee
	 ? kthread_park+0xd4/0xd4
	 ret_from_fork+0x24/0x30

Fixes: 989782dcdc91 ("afs: Overhaul cell database management")
Signed-off-by: David Howells <dhowells@redhat.com>

diff --git a/fs/afs/cell.c b/fs/afs/cell.c
index a2a87117d2626220719cd10e71572c0e5f1b385d..fd5133e26a38b01af89ef488be709eed7987a7c5 100644 (file)
--- a/fs/afs/cell.c
+++ b/fs/afs/cell.c
@@ -74,6 +74,7 @@ struct afs_cell *afs_lookup_cell_rcu(struct afs_net *net,
                        cell = rcu_dereference_raw(net->ws_cell);
                        if (cell) {
                                afs_get_cell(cell);
+                               ret = 0;
                                break;
                        }
                        ret = -EDESTADDRREQ;
@@ -108,6 +109,9 @@ struct afs_cell *afs_lookup_cell_rcu(struct afs_net *net,
 
        done_seqretry(&net->cells_lock, seq);
 
+       if (ret != 0 && cell)
+               afs_put_cell(net, cell);
+
        return ret == 0 ? cell : ERR_PTR(ret);
 }