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tcp_ipv6: fix use of uninitialized memory 

inet6_rsk() is called on a struct request_sock * before we
have checked whether the socket is an ipv6 socket or a ipv6-
mapped ipv4 socket. The access that triggers this is the
inet_rsk(rsk)->inet6_rsk_offset dereference in inet6_rsk().

This is arguably not a critical error as the inet6_rsk_offset
is only used to compute a pointer which is never really used
(in the code path in question) anyway. But it might be a
latent error, so let's fix it.

Spotted by kmemcheck.

Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vegard Nossum 2008-09-12 16:17:43 -07:00 committed by David S. Miller
parent f262b59bec
commit 78d15e8275
1 changed files with 2 additions and 1 deletions
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3
net/ipv6/tcp_ipv6.c
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@ -1286,7 +1286,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
struct request_sock *req,
struct dst_entry *dst)
{
struct inet6_request_sock *treq = inet6_rsk(req);
struct inet6_request_sock *treq;
struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
struct tcp6_sock *newtcp6sk;
struct inet_sock *newinet;
@ -1350,6 +1350,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
return newsk;
}
treq = inet6_rsk(req);
opt = np->opt;
if (sk_acceptq_is_full(sk))