aboutsummaryrefslogtreecommitdiffstats
path: root/net
diff options
context:
space:
mode:
authorTrond Myklebust <Trond.Myklebust@netapp.com>2013-07-10 15:33:01 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2013-07-10 15:58:55 -0400
commiteeee245268c951262b861bc1be4e9dc812352499 (patch)
tree055c5d4ea0406bbb5457052ee85148b5f9746cf7 /net
parent4f8568cb5290295c384d5c1328c52790e33a8a0d (diff)
SUNRPC: Fix a deadlock in rpc_client_register()
Commit 384816051ca9125cd54750e59c780c2a2655fa4f (SUNRPC: fix races on PipeFS MOUNT notifications) introduces a regression when we call rpc_setup_pipedir() with RPCSEC_GSS as the auth flavour. By calling rpcauth_create() while holding the sn->pipefs_sb_lock, we end up deadlocking in gss_pipes_dentries_create_net(). Fix is to register the client and release the mutex before calling rpcauth_create(). Reported-by: Weston Andros Adamson <dros@netapp.com> Tested-by: Weston Andros Adamson <dros@netapp.com> Cc: Stanislav Kinsbursky <skinsbursky@parallels.com> Cc: <stable@vger.kernel.org> # : 3848160: SUNRPC: fix races on PipeFS MOUNT Cc: <stable@vger.kernel.org> # : e73f4cc: SUNRPC: split client creation Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/clnt.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index f0339ae9bf37..aa401560777b 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -290,7 +290,7 @@ static int rpc_client_register(const struct rpc_create_args *args,
struct rpc_auth *auth;
struct net *net = rpc_net_ns(clnt);
struct super_block *pipefs_sb;
- int err = 0;
+ int err;
pipefs_sb = rpc_get_sb_net(net);
if (pipefs_sb) {
@@ -299,6 +299,10 @@ static int rpc_client_register(const struct rpc_create_args *args,
goto out;
}
+ rpc_register_client(clnt);
+ if (pipefs_sb)
+ rpc_put_sb_net(net);
+
auth = rpcauth_create(args->authflavor, clnt);
if (IS_ERR(auth)) {
dprintk("RPC: Couldn't create auth handle (flavor %u)\n",
@@ -306,16 +310,14 @@ static int rpc_client_register(const struct rpc_create_args *args,
err = PTR_ERR(auth);
goto err_auth;
}
-
- rpc_register_client(clnt);
+ return 0;
+err_auth:
+ pipefs_sb = rpc_get_sb_net(net);
+ __rpc_clnt_remove_pipedir(clnt);
out:
if (pipefs_sb)
rpc_put_sb_net(net);
return err;
-
-err_auth:
- __rpc_clnt_remove_pipedir(clnt);
- goto out;
}
static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt)

Privacy Policy