]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commitdiff
nfs: system crashes after NFS4ERR_MOVED recovery
authorBill.Baker@oracle.com <Bill.Baker@oracle.com>
Wed, 21 Feb 2018 18:46:43 +0000 (12:46 -0600)
committerTrond Myklebust <trond.myklebust@primarydata.com>
Thu, 22 Feb 2018 17:17:42 +0000 (12:17 -0500)
nfs4_update_server unconditionally releases the nfs_client for the
source server. If migration fails, this can cause the source server's
nfs_client struct to be left with a low reference count, resulting in
use-after-free.  Also, adjust reference count handling for ELOOP.

NFS: state manager: migration failed on NFSv4 server nfsvmu10 with error 6
WARNING: CPU: 16 PID: 17960 at fs/nfs/client.c:281 nfs_put_client+0xfa/0x110 [nfs]()
nfs_put_client+0xfa/0x110 [nfs]
nfs4_run_state_manager+0x30/0x40 [nfsv4]
kthread+0xd8/0xf0

BUG: unable to handle kernel NULL pointer dereference at 00000000000002a8
nfs4_xdr_enc_write+0x6b/0x160 [nfsv4]
rpcauth_wrap_req+0xac/0xf0 [sunrpc]
call_transmit+0x18c/0x2c0 [sunrpc]
__rpc_execute+0xa6/0x490 [sunrpc]
rpc_async_schedule+0x15/0x20 [sunrpc]
process_one_work+0x160/0x470
worker_thread+0x112/0x540
? rescuer_thread+0x3f0/0x3f0
kthread+0xd8/0xf0

This bug was introduced by 32e62b7c ("NFS: Add nfs4_update_server"),
but the fix applies cleanly to 52442f9b ("NFS4: Avoid migration loops")

Reported-by: Helen Chao <helen.chao@oracle.com>
Fixes: 52442f9b11b7 ("NFS4: Avoid migration loops")
Signed-off-by: Bill Baker <bill.baker@oracle.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
fs/nfs/nfs4client.c

index 04612c24d39431b15ff58027a7ebfe7b5450d774..979631411a0e4ea5a7eedc3c668d36a57c20ced6 100644 (file)
@@ -868,8 +868,10 @@ static int nfs4_set_client(struct nfs_server *server,
        if (IS_ERR(clp))
                return PTR_ERR(clp);
 
-       if (server->nfs_client == clp)
+       if (server->nfs_client == clp) {
+               nfs_put_client(clp);
                return -ELOOP;
+       }
 
        /*
         * Query for the lease time on clientid setup or renewal
@@ -1244,11 +1246,11 @@ int nfs4_update_server(struct nfs_server *server, const char *hostname,
                                clp->cl_proto, clnt->cl_timeout,
                                clp->cl_minorversion, net);
        clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
-       nfs_put_client(clp);
        if (error != 0) {
                nfs_server_insert_lists(server);
                return error;
        }
+       nfs_put_client(clp);
 
        if (server->nfs_client->cl_hostname == NULL)
                server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);