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inet: Avoid potential NULL peer dereference.

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We handle NULL in rt{,6}_set_peer but then our caller will try to pass
that NULL pointer into inet_putpeer() which isn't ready for it.

Fix this by moving the NULL check one level up, and then remove the
now unnecessary NULL check from inetpeer_ptr_set_peer().

Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2012-06-11 04:13:57 -07:00
parent 8b96d22d7a
commit 7b34ca2ac7
3 changed files with 13 additions and 10 deletions
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11
net/ipv4/route.c
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@@ -1333,11 +1333,12 @@ void rt_bind_peer(struct rtable *rt, __be32 daddr, int create)
return;
peer = inet_getpeer_v4(base, daddr, create);
if (!rt_set_peer(rt, peer))
inet_putpeer(peer);
else
rt->rt_peer_genid = rt_peer_genid();
if (peer) {
if (!rt_set_peer(rt, peer))
inet_putpeer(peer);
else
rt->rt_peer_genid = rt_peer_genid();
}
}
/*