linux-kernel - [PATCH 4.17 221/336] staging: lustre: o2iblnd: fix race at kiblnd_connect

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Date:   Wed,  1 Aug 2018 18:49:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Alexander Boyko <alexander.boyko@...gate.com>,
        Alexey Lyashkov <c17817@...y.com>,
        Doug Oucharek <dougso@...com>,
        "John L. Hammond" <john.hammond@...el.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.17 221/336] staging: lustre: o2iblnd: fix race at kiblnd_connect_peer

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Doug Oucahrek <dougso@...com>

[ Upstream commit cf04968efe341b9b1c30a527e5dd61b2af9c43d2 ]

cmid will be destroyed at OFED if kiblnd_cm_callback return error.
if error happen before the end of kiblnd_connect_peer, it will touch
destroyed cmid and fail as
(o2iblnd_cb.c:1315:kiblnd_connect_peer())
            ASSERTION( cmid->device != ((void *)0) ) failed:

Signed-off-by: Alexander Boyko <alexander.boyko@...gate.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-10015
Reviewed-by: Alexey Lyashkov <c17817@...y.com>
Reviewed-by: Doug Oucharek <dougso@...com>
Reviewed-by: John L. Hammond <john.hammond@...el.com>
Signed-off-by: Doug Oucharek <dougso@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c |   18 +++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

--- a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
+++ b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
@@ -1290,11 +1290,6 @@ kiblnd_connect_peer(struct kib_peer *pee
 		goto failed2;
 	}
 
-	LASSERT(cmid->device);
-	CDEBUG(D_NET, "%s: connection bound to %s:%pI4h:%s\n",
-	       libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
-	       &dev->ibd_ifip, cmid->device->name);
-
 	return;
 
  failed2:
@@ -2996,8 +2991,19 @@ kiblnd_cm_callback(struct rdma_cm_id *cm
 		} else {
 			rc = rdma_resolve_route(
 				cmid, *kiblnd_tunables.kib_timeout * 1000);
-			if (!rc)
+			if (!rc) {
+				struct kib_net *net = peer->ibp_ni->ni_data;
+				struct kib_dev *dev = net->ibn_dev;
+
+				CDEBUG(D_NET, "%s: connection bound to "\
+				       "%s:%pI4h:%s\n",
+				       libcfs_nid2str(peer->ibp_nid),
+				       dev->ibd_ifname,
+				       &dev->ibd_ifip, cmid->device->name);
+
 				return 0;
+			}
+
 			/* Can't initiate route resolution */
 			CERROR("Can't resolve route for %s: %d\n",
 			       libcfs_nid2str(peer->ibp_nid), rc);