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authorBart Van Assche <bart.vanassche@sandisk.com>2016-12-19 18:00:05 +0100
committerDoug Ledford <dledford@redhat.com>2016-12-22 11:33:57 -0500
commitfba332b079029c2f4f7e84c1c1cd8e3867310c90 (patch)
tree60e2bd22ce1bb1cd2ab297cc1048fdfa96b44a25
parente259934d4df7f99f2a5c2c4f074f6a55bd4b1722 (diff)
IB/cma: Fix a race condition in iboe_addr_get_sgid()
Code that dereferences the struct net_device ip_ptr member must be protected with an in_dev_get() / in_dev_put() pair. Hence insert calls to these functions. Fixes: commit 7b85627b9f02 ("IB/cma: IBoE (RoCE) IP-based GID addressing") Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Moni Shoua <monis@mellanox.com> Cc: Or Gerlitz <ogerlitz@mellanox.com> Cc: Roland Dreier <roland@purestorage.com> Cc: <stable@vger.kernel.org> Signed-off-by: Doug Ledford <dledford@redhat.com>
-rw-r--r--include/rdma/ib_addr.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/rdma/ib_addr.h b/include/rdma/ib_addr.h
index 931a47ba4571..1beab5532035 100644
--- a/include/rdma/ib_addr.h
+++ b/include/rdma/ib_addr.h
@@ -205,10 +205,12 @@ static inline void iboe_addr_get_sgid(struct rdma_dev_addr *dev_addr,
dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
if (dev) {
- ip4 = (struct in_device *)dev->ip_ptr;
- if (ip4 && ip4->ifa_list && ip4->ifa_list->ifa_address)
+ ip4 = in_dev_get(dev);
+ if (ip4 && ip4->ifa_list && ip4->ifa_list->ifa_address) {
ipv6_addr_set_v4mapped(ip4->ifa_list->ifa_address,
(struct in6_addr *)gid);
+ in_dev_put(ip4);
+ }
dev_put(dev);
}
}