From: Bryan Schumaker <bjschuma@xxxxxxxxxx>
f39c1bfb5a03e2d255451bff05be0d7255298fa4 (SUNRPC: Fix a UDP transport
regression) introduced the "alloc_slot" function for xprt operations,
but never created one for the backchannel operations. This patch fixes
a null pointer dereference when mounting NFS over v4.1.
Call Trace:
[<ffffffffa0207957>] ? xprt_reserve+0x47/0x50 [sunrpc]
[<ffffffffa02023a4>] call_reserve+0x34/0x60 [sunrpc]
[<ffffffffa020e280>] __rpc_execute+0x90/0x400 [sunrpc]
[<ffffffffa020e61a>] rpc_async_schedule+0x2a/0x40 [sunrpc]
[<ffffffff81073589>] process_one_work+0x139/0x500
[<ffffffff81070e70>] ? alloc_worker+0x70/0x70
[<ffffffffa020e5f0>] ? __rpc_execute+0x400/0x400 [sunrpc]
[<ffffffff81073d1e>] worker_thread+0x15e/0x460
[<ffffffff8145c839>] ? preempt_schedule+0x49/0x70
[<ffffffff81073bc0>] ? rescuer_thread+0x230/0x230
[<ffffffff81079603>] kthread+0x93/0xa0
[<ffffffff81465d04>] kernel_thread_helper+0x4/0x10
[<ffffffff81079570>] ? kthread_freezable_should_stop+0x70/0x70
[<ffffffff81465d00>] ? gs_change+0x13/0x13
Signed-off-by: Bryan Schumaker <bjschuma@xxxxxxxxxx>
---
net/sunrpc/xprtsock.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 86b7777..aaaadfb 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -2521,6 +2521,7 @@ static struct rpc_xprt_ops xs_tcp_ops = {
static struct rpc_xprt_ops bc_tcp_ops = {
.reserve_xprt = xprt_reserve_xprt,
.release_xprt = xprt_release_xprt,
+ .alloc_slot = xprt_alloc_slot,
.rpcbind = xs_local_rpcbind,
.buf_alloc = bc_malloc,
.buf_free = bc_free,
--
1.7.12.1
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