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IB/cma: Fix reference count leak when no ipv4 addresses are set 

Once in_dev_get is called to receive in_device pointer, the
in_device reference counter is increased, but if there are
no ipv4 addresses configured on the net-device the ifa_list
will be null, resulting in a flow that doesn't call in_dev_put
to decrease the ref_cnt.
This was exposed when running RoCE over ipv6 without any ipv4
addresses configured

Fixes: commit 8e3867310c90 ("IB/cma: Fix a race condition in iboe_addr_get_sgid()")

Signed-off-by: Michal Kalderon <Michal.Kalderon@cavium.com>
Signed-off-by: Ariel Elior <Ariel.Elior@cavium.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Kalderon, Michal 2017-07-06 23:22:11 +03:00 committed by Doug Ledford
parent e6e52aec49
commit 963916fdb3
1 changed files with 4 additions and 2 deletions
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6
include/rdma/ib_addr.h
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@ -205,11 +205,13 @@ 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 = in_dev_get(dev);
if (ip4 && ip4->ifa_list && ip4->ifa_list->ifa_address) {
if (ip4 && ip4->ifa_list && ip4->ifa_list->ifa_address)
ipv6_addr_set_v4mapped(ip4->ifa_list->ifa_address,
(struct in6_addr *)gid);
if (ip4)
in_dev_put(ip4);
}
dev_put(dev);
}
}