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authorAnna Schumaker <Anna.Schumaker@Netapp.com>2016-10-26 17:33:31 +0300
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2016-11-07 22:35:59 +0300
commitbb29dd84333a96f309c6d0f88b285b5b78927058 (patch)
treef906f39e20f6a487c65ffb935e870866da4fd99a /net/sunrpc/clnt.c
parent68a564006a21ae59c7c51b4359e2e8efa42ae4af (diff)
downloadlinux-bb29dd84333a96f309c6d0f88b285b5b78927058.tar.xz
SUNRPC: Fix suspicious RCU usage
We need to hold the rcu_read_lock() when calling rcu_dereference(), otherwise we can't guarantee that the object being dereferenced still exists. Fixes: 39e5d2df ("SUNRPC search xprt switch for sockaddr") Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc/clnt.c')
-rw-r--r--net/sunrpc/clnt.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 34dd7b26ee5f..62a482790937 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -2753,14 +2753,18 @@ EXPORT_SYMBOL_GPL(rpc_cap_max_reconnect_timeout);
void rpc_clnt_xprt_switch_put(struct rpc_clnt *clnt)
{
+ rcu_read_lock();
xprt_switch_put(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));
+ rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_put);
void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *clnt, struct rpc_xprt *xprt)
{
+ rcu_read_lock();
rpc_xprt_switch_add_xprt(rcu_dereference(clnt->cl_xpi.xpi_xpswitch),
xprt);
+ rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_add_xprt);
@@ -2770,9 +2774,8 @@ bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt,
struct rpc_xprt_switch *xps;
bool ret;
- xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
-
rcu_read_lock();
+ xps = rcu_dereference(clnt->cl_xpi.xpi_xpswitch);
ret = rpc_xprt_switch_has_addr(xps, sap);
rcu_read_unlock();
return ret;