[PATCH 4.4 08/48] IB/cma: Fix reference count leak when no ipv4 addresses are set - Greg Kroah-Hartman

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org,
	Michal Kalderon <Michal.Kalderon@cavium.com>,
	Ariel Elior <Ariel.Elior@cavium.com>,
	Doug Ledford <dledford@redhat.com>,
	Guenter Roeck <linux@roeck-us.net>
Subject: [PATCH 4.4 08/48] IB/cma: Fix reference count leak when no ipv4 addresses are set
Date: Mon,  1 Jun 2020 19:53:18 +0200	[thread overview]
Message-ID: <20200601173954.755172639@linuxfoundation.org> (raw)
In-Reply-To: <20200601173952.175939894@linuxfoundation.org>

From: Kalderon, Michal <Michal.Kalderon@cavium.com>

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@cavium.com>
Signed-off-by: Ariel Elior <Ariel.Elior@cavium.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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
@@ -200,11 +200,13 @@ 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);
 	}
 }


