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IB/core: Fix possible crash to access NULL netdev

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[ 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@mellanox.com>
Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Parav Pandit 2018-03-07 08:07:41 +02:00 committed by Greg Kroah-Hartman
parent 57f1033e92
commit 9bcfd1c63a
1 changed files with 3 additions and 4 deletions
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7
drivers/infiniband/core/sa_query.c
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@ -1137,10 +1137,9 @@ int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
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();