From 3bc07321ccc236f693ce1b6a8786f0a2e38bb87e Mon Sep 17 00:00:00 2001 From: Steffen Klassert <steffen.klassert@secunet.com> Date: Tue, 15 Mar 2011 21:08:28 +0000 Subject: [PATCH] xfrm: Force a dst refcount before entering the xfrm type handlers Crypto requests might return asynchronous. In this case we leave the rcu protected region, so force a refcount on the skb's destination entry before we enter the xfrm type input/output handlers. This fixes a crash when a route is deleted whilst sending IPsec data that is transformed by an asynchronous algorithm. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: David S. Miller <davem@davemloft.net> --- net/xfrm/xfrm_input.c | 2 ++ net/xfrm/xfrm_output.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c index 872065ca7f8c..341cd1189f8a 100644 --- a/net/xfrm/xfrm_input.c +++ b/net/xfrm/xfrm_input.c @@ -190,6 +190,8 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) XFRM_SKB_CB(skb)->seq.input.low = seq; XFRM_SKB_CB(skb)->seq.input.hi = seq_hi; + skb_dst_force(skb); + nexthdr = x->type->input(x, skb); if (nexthdr == -EINPROGRESS) diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c index 1aba03f449cc..8f3f0eedc5a4 100644 --- a/net/xfrm/xfrm_output.c +++ b/net/xfrm/xfrm_output.c @@ -78,6 +78,8 @@ static int xfrm_output_one(struct sk_buff *skb, int err) spin_unlock_bh(&x->lock); + skb_dst_force(skb); + err = x->type->output(x, skb); if (err == -EINPROGRESS) goto out_exit;