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authorOliver Hartkopp <oliver@hartkopp.net>2009-08-13 22:54:25 +0000
committerDavid S. Miller <davem@davemloft.net>2009-08-14 16:36:57 -0700
commit1758c0947605211ef953cc91d6bbdf847a21b822 (patch)
tree695e60450ec85f7e48b00949c29324c89eca7f20 /net/can
parent49d4b8ba97034469b941d00d5ca1e3b897394e35 (diff)
downloadlinux-2.6.38-lt-ux500-1758c0947605211ef953cc91d6bbdf847a21b822.tar.gz
can: Use WARN_ONCE() instead of BUG_ON() for sanity check in receive path
To ensure a proper handling of CAN frames transported in skbuffs some checks need to be performed at receive time. As stated by Michael Olbrich and Luotao Fu BUG_ON() might be to restrictive. This is right as we can just drop the non conform skbuff and the Kernel can continue working. This patch replaces the BUG_ON() with a WARN_ONCE() so that the system remains healthy but we made the problem visible (once). Signed-off-by: Oliver Hartkopp <oliver@hartkopp.net> Signed-off-by: Urs Thuermann <urs@isnogud.escape.de> CC: Michael Olbrich <m.olbrich@pengutronix.de> CC: Luotao Fu <l.fu@pengutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/can')
-rw-r--r--net/can/af_can.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/net/can/af_can.c b/net/can/af_can.c
index e733725b11d..f9c027be78b 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -651,12 +651,16 @@ static int can_rcv(struct sk_buff *skb, struct net_device *dev,
struct can_frame *cf = (struct can_frame *)skb->data;
int matches;
- if (dev->type != ARPHRD_CAN || !net_eq(dev_net(dev), &init_net)) {
- kfree_skb(skb);
- return 0;
- }
+ if (!net_eq(dev_net(dev), &init_net))
+ goto drop;
- BUG_ON(skb->len != sizeof(struct can_frame) || cf->can_dlc > 8);
+ if (WARN_ONCE(dev->type != ARPHRD_CAN ||
+ skb->len != sizeof(struct can_frame) ||
+ cf->can_dlc > 8,
+ "PF_CAN: dropped non conform skbuf: "
+ "dev type %d, len %d, can_dlc %d\n",
+ dev->type, skb->len, cf->can_dlc))
+ goto drop;
/* update statistics */
can_stats.rx_frames++;
@@ -683,6 +687,10 @@ static int can_rcv(struct sk_buff *skb, struct net_device *dev,
}
return 0;
+
+drop:
+ kfree_skb(skb);
+ return 0;
}
/*