ah: Don't return NET_XMIT_DROP on input.

BugLink: http://bugs.launchpad.net/bugs/926309

commit 4b90a603a1b21d63cf743cc833680cb195a729f6 upstream.

When the ahash driver returns -EBUSY, AH4/6 input functions return
NET_XMIT_DROP, presumably copied from the output code path.  But
returning transmit codes on input doesn't make a lot of sense.
Since NET_XMIT_DROP is a positive int, this gets interpreted as
the next header type (i.e., success).  As that can only end badly,
remove the check.

Signed-off-by: Nick Bowler <nbowler@elliptictech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index 7a33aaa0022..4c0f894d084 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -581,8 +581,6 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
                 if (err == -EINPROGRESS)
                         goto out;
 
-                if (err == -EBUSY)
-                        err = NET_XMIT_DROP;
                 goto out_free;
         }