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| author | Trond Myklebust <trond.myklebust@primarydata.com> | 2015-01-31 00:12:28 +0100 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2015-02-03 22:40:17 +0100 |
| commit | 03a9a42a1a7e5b3e7919ddfacc1d1cc81882a955 (patch) | |
| tree | eb1e9497ef3e6dd0090cfb054cfe08b6bbea5d6a /net/sunrpc/clnt.c | |
| parent | Merge branch 'flexfiles' (diff) | |
| download | linux-03a9a42a1a7e5b3e7919ddfacc1d1cc81882a955.tar.xz linux-03a9a42a1a7e5b3e7919ddfacc1d1cc81882a955.zip | |
SUNRPC: NULL utsname dereference on NFS umount during namespace cleanup
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>
Diffstat (limited to 'net/sunrpc/clnt.c')
| -rw-r--r-- | net/sunrpc/clnt.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 05da12a33945..3f5d4d48f0cb 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -286,10 +286,8 @@ static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt, static void rpc_clnt_set_nodename(struct rpc_clnt *clnt, const char *nodename) { - clnt->cl_nodelen = strlen(nodename); - if (clnt->cl_nodelen > UNX_MAXNODENAME) - clnt->cl_nodelen = UNX_MAXNODENAME; - memcpy(clnt->cl_nodename, nodename, clnt->cl_nodelen); + clnt->cl_nodelen = strlcpy(clnt->cl_nodename, + nodename, sizeof(clnt->cl_nodename)); } static int rpc_client_register(struct rpc_clnt *clnt, @@ -365,6 +363,7 @@ static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, const struct rpc_version *version; struct rpc_clnt *clnt = NULL; const struct rpc_timeout *timeout; + const char *nodename = args->nodename; int err; /* sanity check the name before trying to print it */ @@ -420,8 +419,10 @@ static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, atomic_set(&clnt->cl_count, 1); + if (nodename == NULL) + nodename = utsname()->nodename; /* save the nodename */ - rpc_clnt_set_nodename(clnt, utsname()->nodename); + rpc_clnt_set_nodename(clnt, nodename); err = rpc_client_register(clnt, args->authflavor, args->client_name); if (err) @@ -576,6 +577,7 @@ static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args, if (xprt == NULL) goto out_err; args->servername = xprt->servername; + args->nodename = clnt->cl_nodename; new = rpc_new_client(args, xprt, clnt); if (IS_ERR(new)) { |