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SUNRPC: Fix an RCU dereference in xprt_reserve

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Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
2013-01-08 10:03:22 -05:00
parent 6a24dfb645
commit 45bc0dce98
1 changed files with 4 additions and 1 deletions
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net/sunrpc/xprt.c
+4 -1
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@@ -1093,7 +1093,7 @@ EXPORT_SYMBOL_GPL(xprt_free);
*/ */
void xprt_reserve(struct rpc_task *task) void xprt_reserve(struct rpc_task *task)
{ {
struct rpc_xprt *xprt = task->tk_xprt; struct rpc_xprt *xprt;
task->tk_status = 0; task->tk_status = 0;
if (task->tk_rqstp != NULL) if (task->tk_rqstp != NULL)
@@ -1101,7 +1101,10 @@ void xprt_reserve(struct rpc_task *task)
task->tk_timeout = 0; task->tk_timeout = 0;
task->tk_status = -EAGAIN; task->tk_status = -EAGAIN;
rcu_read_lock();
xprt = rcu_dereference(task->tk_client->cl_xprt);
xprt->ops->alloc_slot(xprt, task); xprt->ops->alloc_slot(xprt, task);
rcu_read_unlock();
} }
static inline __be32 xprt_alloc_xid(struct rpc_xprt *xprt) static inline __be32 xprt_alloc_xid(struct rpc_xprt *xprt)