This is a note to let you know that I've just added the patch titled
RDMA/rxe: Fix packet length checks
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rdma-rxe-fix-packet-length-checks.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 4446f7c1a5b8a9a420436062d9241d4236f67933
Author: Bob Pearson <rpearsonhpe@xxxxxxxxx>
Date: Wed May 17 12:22:42 2023 -0500
RDMA/rxe: Fix packet length checks
[ Upstream commit 9a3763e87379c97a78b7c6c6f40720b1e877174f ]
In rxe_net.c a received packet, from udp or loopback, is passed to
rxe_rcv() in rxe_recv.c as a udp packet. I.e. skb->data is pointing at the
udp header. But rxe_rcv() makes length checks to verify the packet is long
enough to hold the roce headers as if it were a roce
packet. I.e. skb->data pointing at the bth header. A runt packet would
appear to have 8 more bytes than it actually does which may lead to
incorrect behavior.
This patch calls skb_pull() to adjust the skb to point at the bth header
before calling rxe_rcv() which fixes this error.
Fixes: 8700e3e7c485 ("Soft RoCE driver")
Link: https://lore.kernel.org/r/20230517172242.1806340-1-rpearsonhpe@xxxxxxxxx
Signed-off-by: Bob Pearson <rpearsonhpe@xxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/infiniband/sw/rxe/rxe_net.c b/drivers/infiniband/sw/rxe/rxe_net.c
index a2ace42e95366..e8403a70c6b74 100644
--- a/drivers/infiniband/sw/rxe/rxe_net.c
+++ b/drivers/infiniband/sw/rxe/rxe_net.c
@@ -159,6 +159,9 @@ static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
pkt->mask = RXE_GRH_MASK;
pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph);
+ /* remove udp header */
+ skb_pull(skb, sizeof(struct udphdr));
+
rxe_rcv(skb);
return 0;
@@ -401,6 +404,9 @@ static int rxe_loopback(struct sk_buff *skb, struct rxe_pkt_info *pkt)
return -EIO;
}
+ /* remove udp header */
+ skb_pull(skb, sizeof(struct udphdr));
+
rxe_rcv(skb);
return 0;
