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RDMA/rxe: Fix packet length checks

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[ Upstream commit 9a3763e873 ]

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: 8700e3e7c4 ("Soft RoCE driver")
Link: https://lore.kernel.org/r/20230517172242.1806340-1-rpearsonhpe@gmail.com
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bob Pearson 2023-05-17 12:22:42 -05:00 committed by Greg Kroah-Hartman
parent 00b276bc7b
commit 7617a59f00
1 changed files with 6 additions and 0 deletions
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6
drivers/infiniband/sw/rxe/rxe_net.c
View file

@ -156,6 +156,9 @@ 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;
@ -397,6 +400,9 @@ 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;