Patchwork [4/5] xfrm: fix freed block size calculation in xfrm_policy_fini()

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Submitter Steffen Klassert
Date Jan. 22, 2013, 9:06 a.m.
Message ID <1358845596-2066-5-git-send-email-steffen.klassert@secunet.com>
Download mbox | patch
Permalink /patch/214474/
State Accepted
Delegated to: David Miller
Headers show

Comments

Steffen Klassert - Jan. 22, 2013, 9:06 a.m.
From: Michal Kubecek <mkubecek@suse.cz>

Missing multiplication of block size by sizeof(struct hlist_head)
can cause xfrm_hash_free() to be called with wrong second argument
so that kfree() is called on a block allocated with vzalloc() or
__get_free_pages() or free_pages() is called with wrong order when
a namespace with enough policies is removed.

Bug introduced by commit a35f6c5d, i.e. versions >= 2.6.29 are
affected.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
---
 net/xfrm/xfrm_policy.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 41eabc4..07c5857 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2656,7 +2656,7 @@  static void xfrm_policy_fini(struct net *net)
 		WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
 
 		htab = &net->xfrm.policy_bydst[dir];
-		sz = (htab->hmask + 1);
+		sz = (htab->hmask + 1) * sizeof(struct hlist_head);
 		WARN_ON(!hlist_empty(htab->table));
 		xfrm_hash_free(htab->table, sz);
 	}