RDMA/core: Fix double put of resource

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>

diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index 9eec26d10d7b1884bf0d15aa7f2d6fa1fed40a77..e16105be2eb238934655aa186693317e54b1375c 100644 (file)
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -1292,11 +1292,10 @@ static int res_get_common_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
        has_cap_net_admin = netlink_capable(skb, CAP_NET_ADMIN);
 
        ret = fill_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);