2018-01-15 14:26:15 +03:00
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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2017-12-04 11:10:14 +03:00
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From: Parav Pandit <parav@mellanox.com>
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2018-01-06 17:10:22 +03:00
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Date: Fri, 5 Jan 2018 23:51:12 +0100
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2018-01-15 14:26:15 +03:00
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Subject: [PATCH] IB/core: Avoid crash on pkey enforcement failed in received
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MADs
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2018-01-06 17:10:22 +03:00
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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2017-12-04 11:10:14 +03:00
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commit 89548bcafec7ecfeea58c553f0834b5d575a66eb upstream.
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Below kernel crash is observed when Pkey security enforcement fails on
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received MADs. This issue is reported in [1].
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ib_free_recv_mad() accesses the rmpp_list, whose initialization is
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needed before accessing it.
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When security enformcent fails on received MADs, MAD processing avoided
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due to security checks failed.
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OpenSM[3770]: SM port is down
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kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
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kernel: IP: ib_free_recv_mad+0x44/0xa0 [ib_core]
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kernel: PGD 0
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kernel: P4D 0
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kernel:
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kernel: Oops: 0002 [#1] SMP
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kernel: CPU: 0 PID: 2833 Comm: kworker/0:1H Tainted: P IO 4.13.4-1-pve #1
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kernel: Hardware name: Dell XS23-TY3 /9CMP63, BIOS 1.71 09/17/2013
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kernel: Workqueue: ib-comp-wq ib_cq_poll_work [ib_core]
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kernel: task: ffffa069c6541600 task.stack: ffffb9a729054000
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kernel: RIP: 0010:ib_free_recv_mad+0x44/0xa0 [ib_core]
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kernel: RSP: 0018:ffffb9a729057d38 EFLAGS: 00010286
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kernel: RAX: ffffa069cb138a48 RBX: ffffa069cb138a10 RCX: 0000000000000000
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kernel: RDX: ffffb9a729057d38 RSI: 0000000000000000 RDI: ffffa069cb138a20
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kernel: RBP: ffffb9a729057d60 R08: ffffa072d2d49800 R09: ffffa069cb138ae0
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kernel: R10: ffffa069cb138ae0 R11: ffffa072b3994e00 R12: ffffb9a729057d38
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kernel: R13: ffffa069d1c90000 R14: 0000000000000000 R15: ffffa069d1c90880
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kernel: FS: 0000000000000000(0000) GS:ffffa069dba00000(0000) knlGS:0000000000000000
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kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
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kernel: CR2: 0000000000000008 CR3: 00000011f51f2000 CR4: 00000000000006f0
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kernel: Call Trace:
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kernel: ib_mad_recv_done+0x5cc/0xb50 [ib_core]
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kernel: __ib_process_cq+0x5c/0xb0 [ib_core]
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kernel: ib_cq_poll_work+0x20/0x60 [ib_core]
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kernel: process_one_work+0x1e9/0x410
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kernel: worker_thread+0x4b/0x410
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kernel: kthread+0x109/0x140
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kernel: ? process_one_work+0x410/0x410
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kernel: ? kthread_create_on_node+0x70/0x70
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kernel: ? SyS_exit_group+0x14/0x20
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kernel: ret_from_fork+0x25/0x30
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kernel: RIP: ib_free_recv_mad+0x44/0xa0 [ib_core] RSP: ffffb9a729057d38
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kernel: CR2: 0000000000000008
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[1] : https://www.spinics.net/lists/linux-rdma/msg56190.html
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Fixes: 47a2b338fe63 ("IB/core: Enforce security on management datagrams")
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Signed-off-by: Parav Pandit <parav@mellanox.com>
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Reported-by: Chris Blake <chrisrblake93@gmail.com>
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Reviewed-by: Daniel Jurgens <danielj@mellanox.com>
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Reviewed-by: Hal Rosenstock <hal@mellanox.com>
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Signed-off-by: Doug Ledford <dledford@redhat.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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drivers/infiniband/core/mad.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c
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index f8f53bb90837..cb91245e9163 100644
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--- a/drivers/infiniband/core/mad.c
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+++ b/drivers/infiniband/core/mad.c
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@@ -1974,14 +1974,15 @@ static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
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unsigned long flags;
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int ret;
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+ INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
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ret = ib_mad_enforce_security(mad_agent_priv,
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mad_recv_wc->wc->pkey_index);
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if (ret) {
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ib_free_recv_mad(mad_recv_wc);
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deref_mad_agent(mad_agent_priv);
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+ return;
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}
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- INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
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list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
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if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
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mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
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--
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2.14.2
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