RDMA/core: Fix double put of resource

[ Upstream commit 50bbe3d34fea74b7c0fabe553c40c2f4a48bb9c3 ]

Do not decrease the reference count of resource tracker object twice in
the error flow of res_get_common_doit.

Fixes: c5dfe0ea6ffa ("RDMA/nldev: Add resource tracker doit callback")
Link: https://lore.kernel.org/r/20200507062942.98305-1-leon@kernel.org
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index ef4b0c7..244ebf2 100644 (file)
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -1248,10 +1248,10 @@ static int res_get_common_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
 
        has_cap_net_admin = netlink_capable(skb, CAP_NET_ADMIN);
        ret = fe->fill_res_func(msg, has_cap_net_admin, res, port);
-       rdma_restrack_put(res);
        if (ret)
                goto err_free;
 
+       rdma_restrack_put(res);
        nlmsg_end(msg, nlh);
        ib_device_put(device);
        return rdma_nl_unicast(sock_net(skb->sk), msg, NETLINK_CB(skb).portid);