RDMA/cxgb4: Added NULL check for lookup_atid

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

commit e766e6a
Author: Mikhail Lobanov <m.lobanov@rosalinux.ru>
Date:   Thu Sep 12 10:58:39 2024 -0400

    RDMA/cxgb4: Added NULL check for lookup_atid

    The lookup_atid() function can return NULL if the ATID is
    invalid or does not exist in the identifier table, which
    could lead to dereferencing a null pointer without a
    check in the `act_establish()` and `act_open_rpl()` functions.
    Add a NULL check to prevent null pointer dereferencing.

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

    Fixes: cfdda9d ("RDMA/cxgb4: Add driver for Chelsio T4 RNIC")
    Signed-off-by: Mikhail Lobanov <m.lobanov@rosalinux.ru>
    Link: https://patch.msgid.link/20240912145844.77516-1-m.lobanov@rosalinux.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

@@ -1222,6 +1222,8 @@ static int act_establish(struct c4iw_dev *dev, struct sk_buff *skb)
 	int ret;
 
 	ep = lookup_atid(t, atid);
+	if (!ep)
+		return -EINVAL;
 
 	pr_debug("ep %p tid %u snd_isn %u rcv_isn %u\n", ep, tid,
 		 be32_to_cpu(req->snd_isn), be32_to_cpu(req->rcv_isn));
@@ -2279,6 +2281,9 @@ static int act_open_rpl(struct c4iw_dev *dev, struct sk_buff *skb)
 	int ret = 0;
 
 	ep = lookup_atid(t, atid);
+	if (!ep)
+		return -EINVAL;
+
 	la = (struct sockaddr_in *)&ep->com.local_addr;
 	ra = (struct sockaddr_in *)&ep->com.remote_addr;
 	la6 = (struct sockaddr_in6 *)&ep->com.local_addr;