Commit 84e28a30 authored Sep 24, 2012 by Bryan Schumaker Committed by Trond Myklebust Sep 25, 2012

SUNRPC: Set alloc_slot for backchannel tcp ops



f39c1bfb (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@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

parent a519fc7a

net/sunrpc/xprtsock.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -2539,6 +2539,7 @@ 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,