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xfrm: fix crash in XFRM_MSG_GETSA netlink handler 

If we hit any of the error conditions inside xfrm_dump_sa(), then
xfrm_state_walk_init() never gets called. However, we still call
xfrm_state_walk_done() from xfrm_dump_sa_done(), which will crash
because the state walk was never initialized properly.

We can fix this by setting cb->args[0] only after we've processed the
first element and checking this before calling xfrm_state_walk_done().

Fixes: d3623099d3 ("ipsec: add support of limited SA dump")
Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Vegard Nossum 2016-07-05 10:18:08 +02:00 committed by Steffen Klassert
parent 8e6ce7ebeb
commit 1ba5bf993c
1 changed files with 3 additions and 3 deletions
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6
net/xfrm/xfrm_user.c
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@ -896,7 +896,8 @@ static int xfrm_dump_sa_done(struct netlink_callback *cb)
struct sock *sk = cb->skb->sk;
struct net *net = sock_net(sk);
xfrm_state_walk_done(walk, net);
if (cb->args[0])
xfrm_state_walk_done(walk, net);
return 0;
}
@ -921,8 +922,6 @@ static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
u8 proto = 0;
int err;
cb->args[0] = 1;
err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
xfrma_policy);
if (err < 0)
@ -939,6 +938,7 @@ static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
proto = nla_get_u8(attrs[XFRMA_PROTO]);
xfrm_state_walk_init(walk, proto, filter);
cb->args[0] = 1;
}
(void) xfrm_state_walk(net, walk, dump_one_state, &info);