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SUNRPC: NULL utsname dereference on NFS umount during namespace cleanup

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Fix an Oopsable condition when nsm_mon_unmon is called as part of the
namespace cleanup, which now apparently happens after the utsname
has been freed.

Link: http://lkml.kernel.org/r/20150125220604.090121ae@neptune.home
Reported-by: Bruno Prémont <bonbons@linux-vserver.org>
Cc: stable@vger.kernel.org # 3.18
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust
2015-01-30 18:12:28 -05:00
parent e2c63e091e
commit 03a9a42a1a
4 changed files with 24 additions and 12 deletions
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8
net/sunrpc/rpcb_clnt.c
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@@ -355,7 +355,8 @@ out:
return result;
}
static struct rpc_clnt *rpcb_create(struct net *net, const char *hostname,
static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,
const char *hostname,
struct sockaddr *srvaddr, size_t salen,
int proto, u32 version)
{
@@ -365,6 +366,7 @@ static struct rpc_clnt *rpcb_create(struct net *net, const char *hostname,
.address = srvaddr,
.addrsize = salen,
.servername = hostname,
.nodename = nodename,
.program = &rpcb_program,
.version = version,
.authflavor = RPC_AUTH_UNIX,
@@ -740,7 +742,9 @@ void rpcb_getport_async(struct rpc_task *task)
dprintk("RPC: %5u %s: trying rpcbind version %u\n",
task->tk_pid, __func__, bind_version);
rpcb_clnt = rpcb_create(xprt->xprt_net, xprt->servername, sap, salen,
rpcb_clnt = rpcb_create(xprt->xprt_net,
clnt->cl_nodename,
xprt->servername, sap, salen,
xprt->prot, bind_version);
if (IS_ERR(rpcb_clnt)) {
status = PTR_ERR(rpcb_clnt);