On Mon, Sep 24, 2012 at 01:39:01PM -0400, bjschuma@xxxxxxxxxx wrote:
> 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.
Thanks, I just rebased some of my work to 3.6 and ran across that! It
crashes the 4.1 server very quickly....
--b.
>
> 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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