3.16.50-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: "Kalderon, Michal" <Michal.Kalderon@xxxxxxxxxx>
commit 963916fdb3e5ad4af57ac959b5a03bf23f7568ca upstream.
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@xxxxxxxxxx>
Signed-off-by: Ariel Elior <Ariel.Elior@xxxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
include/rdma/ib_addr.h | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/include/rdma/ib_addr.h
+++ b/include/rdma/ib_addr.h
@@ -185,11 +185,13 @@ static inline void iboe_addr_get_sgid(st
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);
}
}