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| author | Chuck Lever <chuck.lever@oracle.com> | 2006-10-19 23:28:43 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-20 10:26:39 -0700 |
| commit | 71bdcf8056f910dc57ea3d0def80a9329e7dc52d (patch) | |
| tree | 293bf48584d44b5e27cb5050d4e4ccb5254388a2 /net/sunrpc/pmap_clnt.c | |
| parent | b87c0adfeaaf8d8310c4f790d76072a5961b3518 (diff) | |
| download | linux-3.10-71bdcf8056f910dc57ea3d0def80a9329e7dc52d.tar.gz linux-3.10-71bdcf8056f910dc57ea3d0def80a9329e7dc52d.tar.bz2 linux-3.10-71bdcf8056f910dc57ea3d0def80a9329e7dc52d.zip | |
[PATCH] SUNRPC: fix race in in-kernel RPC portmapper client
When submitting a request to a fast portmapper (such as the local rpcbind
daemon), the request can complete before the parent task is even queued up on
xprt->binding. Fix this by queuing before submitting the rpcbind request.
Test plan:
Connectathon locking test with UDP.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'net/sunrpc/pmap_clnt.c')
| -rw-r--r-- | net/sunrpc/pmap_clnt.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/net/sunrpc/pmap_clnt.c b/net/sunrpc/pmap_clnt.c index 919d5ba7ca0..e52afab413d 100644 --- a/net/sunrpc/pmap_clnt.c +++ b/net/sunrpc/pmap_clnt.c @@ -101,11 +101,13 @@ void rpc_getport(struct rpc_task *task) /* Autobind on cloned rpc clients is discouraged */ BUG_ON(clnt->cl_parent != clnt); - if (xprt_test_and_set_binding(xprt)) { - task->tk_status = -EACCES; /* tell caller to check again */ - rpc_sleep_on(&xprt->binding, task, NULL, NULL); - return; - } + /* Put self on queue before sending rpcbind request, in case + * pmap_getport_done completes before we return from rpc_run_task */ + rpc_sleep_on(&xprt->binding, task, NULL, NULL); + + status = -EACCES; /* tell caller to check again */ + if (xprt_test_and_set_binding(xprt)) + goto bailout_nofree; /* Someone else may have bound if we slept */ status = 0; @@ -134,8 +136,6 @@ void rpc_getport(struct rpc_task *task) goto bailout; rpc_release_task(child); - rpc_sleep_on(&xprt->binding, task, NULL, NULL); - task->tk_xprt->stat.bind_count++; return; |