netdev - [PATCH] net: af_packet: Don't initialize vnet

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:	Thu, 12 May 2011 13:36:10 -0700
From:	Joe Perches <joe@...ches.com>
To:	linux-kernel@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: [PATCH] net: af_packet: Don't initialize vnet_hdr

Save a memset, initialize only the portion necessary.

packet_snd either gets this structure completely from
memcpy_fromiovec or uses only the hdr_len set to 0,
so don't always initialize the structure to 0.

Signed-off-by: Joe Perches <joe@...ches.com>
---
 net/packet/af_packet.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 549527b..ac88df9 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1123,7 +1123,7 @@ static int packet_snd(struct socket *sock,
 	__be16 proto;
 	unsigned char *addr;
 	int ifindex, err, reserve = 0;
-	struct virtio_net_hdr vnet_hdr = { 0 };
+	struct virtio_net_hdr vnet_hdr;
 	int offset = 0;
 	int vnet_hdr_len;
 	struct packet_sock *po = pkt_sk(sk);
@@ -1206,7 +1206,9 @@ static int packet_snd(struct socket *sock,
 				goto out_unlock;

 		}
-	}
+	} else
+		vnet_hdr.hdr_len = 0;
+

 	err = -EMSGSIZE;
 	if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN))
-- 
1.7.5.rc3.dirty

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html