netdev - [PATCH] XFRM: Fix memory leak in xfrm_state

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Date:	Thu, 7 Jul 2011 18:38:52 -0700 (MST)
From:	Tushar Gohad <tgohad@...sta.com>
To:	David Miller <davem@...emloft.net>,
	Herbert Xu <herbert@...dor.apana.org.au>
cc:	netdev@...r.kernel.org, tusharsg@...il.com
Subject: [PATCH] XFRM: Fix memory leak in xfrm_state_update

Upon "ip xfrm state update ..", xfrm_add_sa() takes an extra reference on 
the user-supplied SA and forgets to drop the reference when 
xfrm_state_update() returns 0.  This leads to a memory leak as the 
parameter SA is never freed.  This change attempts to fix the leak by 
calling __xfrm_state_put() when xfrm_state_update() updates a valid SA 
(err = 0).  The parameter SA is added to the gc list when the final 
reference is dropped by xfrm_add_sa() upon completion.

Signed-off-by: Tushar Gohad <tgohad@...sta.com>
---
  net/xfrm/xfrm_state.c |    2 ++
  1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index d70f85e..9414b9c 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -1345,6 +1345,8 @@ out:
  			xfrm_state_check_expire(x1);

  		err = 0;
+		x->km.state = XFRM_STATE_DEAD;
+		__xfrm_state_put(x);
  	}
  	spin_unlock_bh(&x1->lock);

-- 
1.6.3.3.202.g91879

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