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openvswitch: Fix double-free on ip_defrag() errors

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If ip_defrag() returns an error other than -EINPROGRESS, then the skb is
freed. When handle_fragments() passes this back up to
do_execute_actions(), it will be freed again. Prevent this double free
by never freeing the skb in do_execute_actions() for errors returned by
ovs_ct_execute. Always free it in ovs_ct_execute() error paths instead.

Fixes: 7f8a436eaa ("openvswitch: Add conntrack action")
Reported-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Joe Stringer 2015-10-25 20:21:48 -07:00 • committed by David S. Miller
parent c2229fe143
commit 74c1661813
3 changed files with 16 additions and 6 deletions
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4
net/openvswitch/actions.c
View file

@ -1109,8 +1109,8 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
nla_data(a));
/* Hide stolen IP fragments from user space. */
if (err == -EINPROGRESS)
return 0;
if (err)
return err == -EINPROGRESS ? 0 : err;
break;
}