RDMA/cxgb4: Check skb value for failure to allocate

JIRA: https://issues.redhat.com/browse/RHEL-61394

commit 8fb8a82
Author: Artem Chernyshev <artem.chernyshev@red-soft.ru>
Date:   Tue Sep 5 15:40:48 2023 +0300

    RDMA/cxgb4: Check skb value for failure to allocate

    get_skb() can fail to allocate skb, so check it.

    Found by Linux Verification Center (linuxtesting.org) with SVACE.

    Fixes: 5be78ee ("RDMA/cxgb4: Fix LE hash collision bug for active open connection")
    Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru>
    Link: https://lore.kernel.org/r/20230905124048.284165-1-artem.chernyshev@red-soft.ru
    Signed-off-by: Leon Romanovsky <leon@kernel.org>

Signed-off-by: Kamal Heib <kheib@redhat.com>

Author: Kamalheib

drivers/infiniband/hw/cxgb4/cm.c

@@ -1965,6 +1965,9 @@ static int send_fw_act_open_req(struct c4iw_ep *ep, unsigned int atid)
 	int win;
 
 	skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+
 	req = __skb_put_zero(skb, sizeof(*req));
 	req->op_compl = htonl(WR_OP_V(FW_OFLD_CONNECTION_WR));
 	req->len16_pkd = htonl(FW_WR_LEN16_V(DIV_ROUND_UP(sizeof(*req), 16)));