From e7ec96fc7932f48a6d6cdd05bf82004a1a04285b Mon Sep 17 00:00:00 2001
From: Bob Pearson <rpearsonhpe@gmail.com>
Date: Thu, 8 Oct 2020 15:36:52 -0500
Subject: [PATCH 1/1] RDMA/rxe: Fix skb lifetime in rxe_rcv_mcast_pkt()
Git-commit: e7ec96fc7932f48a6d6cdd05bf82004a1a04285b
Patch-mainline: v5.10
References: git-fixes

The changes referenced below replaced sbk_clone)_ by taking additional
references, passing the skb along and then freeing the skb. This
deleted the packets before they could be processed and additionally
passed bad data in each packet. Since pkt is stored in skb->cb
changing pkt->qp changed it for all the packets.

Replace skb_get() by sbk_clone() in rxe_rcv_mcast_pkt() for cases where
multiple QPs are receiving multicast packets on the same address.

Delete kfree_skb() because the packets need to live until they have been
processed by each QP. They are freed later.

Fixes: 86af61764151 ("IB/rxe: remove unnecessary skb_clone")
Fixes: fe896ceb5772 ("IB/rxe: replace refcount_inc with skb_get")
Link: https://lore.kernel.org/r/20201008203651.256958-1-rpearson@hpe.com
Signed-off-by: Bob Pearson <rpearson@hpe.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Nicolas Morey-Chaisemartin <nmoreychaisemartin@suse.com>
---
 drivers/infiniband/sw/rxe/rxe_recv.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/infiniband/sw/rxe/rxe_recv.c b/drivers/infiniband/sw/rxe/rxe_recv.c
index a3eed4da1540..da1d96ec1ba6 100644
--- a/drivers/infiniband/sw/rxe/rxe_recv.c
+++ b/drivers/infiniband/sw/rxe/rxe_recv.c
@@ -233,6 +233,8 @@ static void rxe_rcv_mcast_pkt(struct rxe_dev *rxe, struct sk_buff *skb)
 	struct rxe_mc_elem *mce;
 	struct rxe_qp *qp;
 	union ib_gid dgid;
+	struct sk_buff *per_qp_skb;
+	struct rxe_pkt_info *per_qp_pkt;
 	int err;
 
 	if (skb->protocol == htons(ETH_P_IP))
@@ -261,21 +263,26 @@ static void rxe_rcv_mcast_pkt(struct rxe_dev *rxe, struct sk_buff *skb)
 		if (err)
 			continue;
 
-		/* if *not* the last qp in the list
-		 * increase the users of the skb then post to the next qp
+		/* for all but the last qp create a new clone of the
+		 * skb and pass to the qp.
 		 */
 		if (mce->qp_list.next != &mcg->qp_list)
-			skb_get(skb);
+			per_qp_skb = skb_clone(skb, GFP_ATOMIC);
+		else
+			per_qp_skb = skb;
 
-		pkt->qp = qp;
+		per_qp_pkt = SKB_TO_PKT(per_qp_skb);
+		per_qp_pkt->qp = qp;
 		rxe_add_ref(qp);
-		rxe_rcv_pkt(rxe, pkt, skb);
+		rxe_rcv_pkt(rxe, per_qp_pkt, per_qp_skb);
 	}
 
 	spin_unlock_bh(&mcg->mcg_lock);
 
 	rxe_drop_ref(mcg);	/* drop ref from rxe_pool_get_key. */
 
+	return;
+
 err1:
 	kfree_skb(skb);
 }
-- 
2.35.0