[patch 52/59] AF_PACKET: Check device down state before hard header callbacks.

Chris Wright
2007-02-03T02:44:40Z

[-- Attachment #1: af_packet-check-device-down-state-before-hard-header-callbacks.patch --]
[-- Type: text/plain, Size: 1601 bytes --]

-stable review patch. If anyone has any objections, please let us know.
------------------

From: David S. Miller <davem@sunset.davemloft.net>

If the device is down, invoking the device hard header callbacks
is not legal, so check it early.

Based upon a shaper OOPS report from Frederik Deweerdt.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
net/packet/af_packet.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)

--- linux-2.6.19.2.orig/net/packet/af_packet.c
+++ linux-2.6.19.2/net/packet/af_packet.c
@@ -358,6 +358,10 @@ static int packet_sendmsg_spkt(struct ki
if (dev == NULL)
goto out_unlock;

+ err = -ENETDOWN;
+ if (!(dev->flags & IFF_UP))
+ goto out_unlock;
+
/*
* You may not queue a frame bigger than the mtu. This is the lowest level
* raw protocol and you must do your own fragmentation at this level.
@@ -406,10 +410,6 @@ static int packet_sendmsg_spkt(struct ki
if (err)
goto out_free;

- err = -ENETDOWN;
- if (!(dev->flags & IFF_UP))
- goto out_free;
-
/*
* Now send it
*/
@@ -737,6 +737,10 @@ static int packet_sendmsg(struct kiocb *
if (sock->type == SOCK_RAW)
reserve = dev->hard_header_len;

+ err = -ENETDOWN;
+ if (!(dev->flags & IFF_UP))
+ goto out_unlock;
+
err = -EMSGSIZE;
if (len > dev->mtu+reserve)
goto out_unlock;
@@ -769,10 +773,6 @@ static int packet_sendmsg(struct kiocb *
skb->dev = dev;
skb->priority = sk->sk_priority;

- err = -ENETDOWN;
- if (!(dev->flags & IFF_UP))
- goto out_free;
-
/*
* Now send it
*/

--