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authorramesh.nagappa@gmail.com <ramesh.nagappa@gmail.com>2012-10-05 23:10:15 +0400
committerDavid S. Miller <davem@davemloft.net>2012-10-07 22:42:39 +0400
commite1f165032c8bade3a6bdf546f8faf61fda4dd01c (patch)
tree891c87188420b6a0d42fa25684266ca58ccfe7ef /net/core
parent0bd8ba18b9384e1c9104eee1d912fd5c8b4234c0 (diff)
downloadlinux-e1f165032c8bade3a6bdf546f8faf61fda4dd01c.tar.xz
net: Fix skb_under_panic oops in neigh_resolve_output
The retry loop in neigh_resolve_output() and neigh_connected_output() call dev_hard_header() with out reseting the skb to network_header. This causes the retry to fail with skb_under_panic. The fix is to reset the network_header within the retry loop. Signed-off-by: Ramesh Nagappa <ramesh.nagappa@ericsson.com> Reviewed-by: Shawn Lu <shawn.lu@ericsson.com> Reviewed-by: Robert Coulson <robert.coulson@ericsson.com> Reviewed-by: Billie Alsup <billie.alsup@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/neighbour.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index baca771caae2..22571488730a 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1301,8 +1301,6 @@ int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb)
if (!dst)
goto discard;
- __skb_pull(skb, skb_network_offset(skb));
-
if (!neigh_event_send(neigh, skb)) {
int err;
struct net_device *dev = neigh->dev;
@@ -1312,6 +1310,7 @@ int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb)
neigh_hh_init(neigh, dst);
do {
+ __skb_pull(skb, skb_network_offset(skb));
seq = read_seqbegin(&neigh->ha_lock);
err = dev_hard_header(skb, dev, ntohs(skb->protocol),
neigh->ha, NULL, skb->len);
@@ -1342,9 +1341,8 @@ int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb)
unsigned int seq;
int err;
- __skb_pull(skb, skb_network_offset(skb));
-
do {
+ __skb_pull(skb, skb_network_offset(skb));
seq = read_seqbegin(&neigh->ha_lock);
err = dev_hard_header(skb, dev, ntohs(skb->protocol),
neigh->ha, NULL, skb->len);