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| author |   Parav Pandit <parav@mellanox.com> | 2018-03-07 08:07:41 +0200 |
|---|---|---|
| committer |   Doug Ledford <dledford@redhat.com> | 2018-03-07 15:15:40 -0500 |
| commit | bb7f8f199c354c4cf155b1d6d55f86eaaed7fa5a (patch) | |
| tree | e422de5ac9356ee58a3a097c8645569c1e33c98a /drivers/infiniband/core/sa_query.c | |
| parent | RDMA/bnxt_re: Avoid Hard lockup during error CQE processing (diff) | |
| download | linux-dev-bb7f8f199c354c4cf155b1d6d55f86eaaed7fa5a.tar.xz linux-dev-bb7f8f199c354c4cf155b1d6d55f86eaaed7fa5a.zip | |
IB/core: Fix possible crash to access NULL netdev
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>
Diffstat (limited to '')
| -rw-r--r-- | drivers/infiniband/core/sa_query.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/infiniband/core/sa_query.c b/drivers/infiniband/core/sa_query.c index 8cf15d4a8ac4..9f029a1ca5ea 100644 --- a/drivers/infiniband/core/sa_query.c +++ b/drivers/infiniband/core/sa_query.c @@ -1291,10 +1291,9 @@ int ib_init_ah_attr_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(); |