netdev - [PATCH net v2 1/2] udp: fix gso

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Wed,  2 Oct 2019 13:29:22 -0400
From:   Josh Hunt <johunt@...mai.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, willemb@...gle.com,
        alexander.h.duyck@...el.com, Josh Hunt <johunt@...mai.com>
Subject: [PATCH net v2 1/2] udp: fix gso_segs calculations

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>
---
 net/ipv4/udp.c | 2 +-
 net/ipv6/udp.c | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index cf755156a684..be98d0b8f014 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -856,7 +856,7 @@ static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4,
 
 		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;
 	}
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index aae4938f3dea..eb9a9934ac05 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1143,6 +1143,8 @@ static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6,
 
 		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;
 	}
 
-- 
2.7.4