linux-kernel - [PATCH 4.9 190/329] IB/core: Fix possible crash to access NULL netdev

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Date:   Mon, 28 May 2018 12:01:59 +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, Daniel Jurgens <danielj@...lanox.com>,
        Parav Pandit <parav@...lanox.com>,
        Leon Romanovsky <leon@...nel.org>,
        Doug Ledford <dledford@...hat.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 190/329] IB/core: Fix possible crash to access NULL netdev

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

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

From: Parav Pandit <parav@...lanox.com>

[ Upstream commit bb7f8f199c354c4cf155b1d6d55f86eaaed7fa5a ]

resolved_dev returned might be NULL as ifindex is transient number.
Ignoring NULL check of resolved_dev might crash the kernel.
Therefore perform NULL check before accessing resolved_dev.

Additionally rdma_resolve_ip_route() invokes addr_resolve() which
performs check and address translation for loopback ifindex.
Therefore, checking it again in rdma_resolve_ip_route() is not helpful.
Therefore, the code is simplified to avoid IFF_LOOPBACK check.

Fixes: 200298326b27 ("IB/core: Validate route when we init ah")
Reviewed-by: Daniel Jurgens <danielj@...lanox.com>
Signed-off-by: Parav Pandit <parav@...lanox.com>
Signed-off-by: Leon Romanovsky <leon@...nel.org>
Signed-off-by: Doug Ledford <dledford@...hat.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/infiniband/core/sa_query.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/drivers/infiniband/core/sa_query.c
+++ b/drivers/infiniband/core/sa_query.c
@@ -1137,10 +1137,9 @@ int ib_init_ah_from_path(struct ib_devic
 
 		resolved_dev = dev_get_by_index(dev_addr.net,
 						dev_addr.bound_dev_if);
-		if (resolved_dev->flags & IFF_LOOPBACK) {
-			dev_put(resolved_dev);
-			resolved_dev = idev;
-			dev_hold(resolved_dev);
+		if (!resolved_dev) {
+			dev_put(idev);
+			return -ENODEV;
 		}
 		ndev = ib_get_ndev_from_path(rec);
 		rcu_read_lock();