linux-kernel - [PATCH 4.19 092/106] udp: fix gso

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Message-Id: <20191006171200.501041275@linuxfoundation.org>
Date:   Sun,  6 Oct 2019 19:21:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Josh Hunt <johunt@...mai.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Willem de Bruijn <willemb@...gle.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 092/106] udp: fix gso_segs calculations

From: Josh Hunt <johunt@...mai.com>

[ Upstream commit 44b321e5020d782ad6e8ae8183f09b163be6e6e2 ]

Commit dfec0ee22c0a ("udp: Record gso_segs when supporting UDP segmentation offload")
added gso_segs calculation, but incorrectly got sizeof() the pointer and
not the underlying data type. In addition let's fix the v6 case.

Fixes: bec1f6f69736 ("udp: generate gso with UDP_SEGMENT")
Fixes: dfec0ee22c0a ("udp: Record gso_segs when supporting UDP segmentation offload")
Signed-off-by: Josh Hunt <johunt@...mai.com>
Reviewed-by: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
Acked-by: Willem de Bruijn <willemb@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv4/udp.c |    2 +-
 net/ipv6/udp.c |    2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -810,7 +810,7 @@ static int udp_send_skb(struct sk_buff *
 
 		skb_shinfo(skb)->gso_size = cork->gso_size;
 		skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
-		skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(len - sizeof(uh),
+		skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(len - sizeof(*uh),
 							 cork->gso_size);
 		goto csum_partial;
 	}
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1081,6 +1081,8 @@ static int udp_v6_send_skb(struct sk_buf
 
 		skb_shinfo(skb)->gso_size = cork->gso_size;
 		skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
+		skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(len - sizeof(*uh),
+							 cork->gso_size);
 		goto csum_partial;
 	}