linux-kernel - [PATCH V2 1/2] af_packet: make tpacket_rcv to not set status value before run

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

Message-Id: <1427091073-8129-1-git-send-email-al.drozdov@gmail.com>
Date:	Mon, 23 Mar 2015 09:11:12 +0300
From:	Alexander Drozdov <al.drozdov@...il.com>
To:	"David S. Miller" <davem@...emloft.net>,
	Jonathan Corbet <corbet@....net>
Cc:	Daniel Borkmann <dborkman@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Willem de Bruijn <willemb@...gle.com>,
	"Michael S. Tsirkin" <mst@...hat.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Tobias Klauser <tklauser@...tanz.ch>,
	linux-doc@...r.kernel.org, linux-api@...r.kernel.org,
	Alexander Drozdov <al.drozdov@...il.com>
Subject: [PATCH V2 1/2] af_packet: make tpacket_rcv to not set status value before run_filter

It is just an optimization. We don't need the value of status variable
if the packet is filtered.

Signed-off-by: Alexander Drozdov <al.drozdov@...il.com>
---
 net/packet/af_packet.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index f8db706..6ecf8dd 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1910,14 +1910,15 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
 		}
 	}
 
-	if (skb->ip_summed == CHECKSUM_PARTIAL)
-		status |= TP_STATUS_CSUMNOTREADY;
-
 	snaplen = skb->len;
 
 	res = run_filter(skb, sk, snaplen);
 	if (!res)
 		goto drop_n_restore;
+
+	if (skb->ip_summed == CHECKSUM_PARTIAL)
+		status |= TP_STATUS_CSUMNOTREADY;
+
 	if (snaplen > res)
 		snaplen = res;
 
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/