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| author | Mathias Krause <minipli@googlemail.com> | 2013-04-07 01:51:55 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-04-07 16:28:01 -0400 |
| commit | b860d3cc62877fad02863e2a08efff69a19382d2 (patch) | |
| tree | e654b34c09acf71de2864416e5d13cb3cd0c10f3 /net/l2tp/l2tp_ip6.c | |
| parent | a5598bd9c087dc0efc250a5221e5d0e6f584ee88 (diff) | |
| download | linux-stable-b860d3cc62877fad02863e2a08efff69a19382d2.tar.gz linux-stable-b860d3cc62877fad02863e2a08efff69a19382d2.tar.bz2 linux-stable-b860d3cc62877fad02863e2a08efff69a19382d2.zip | |
l2tp: fix info leak in l2tp_ip6_recvmsg()
The L2TP code for IPv6 fails to initialize the l2tp_conn_id member of
struct sockaddr_l2tpip6 and therefore leaks four bytes kernel stack
in l2tp_ip6_recvmsg() in case msg_name is set.
Initialize l2tp_conn_id with 0 to avoid the info leak.
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/l2tp/l2tp_ip6.c')
| -rw-r--r-- | net/l2tp/l2tp_ip6.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c index c74f5a91ff6a..b8a6039314e8 100644 --- a/net/l2tp/l2tp_ip6.c +++ b/net/l2tp/l2tp_ip6.c @@ -690,6 +690,7 @@ static int l2tp_ip6_recvmsg(struct kiocb *iocb, struct sock *sk, lsa->l2tp_addr = ipv6_hdr(skb)->saddr; lsa->l2tp_flowinfo = 0; lsa->l2tp_scope_id = 0; + lsa->l2tp_conn_id = 0; if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL) lsa->l2tp_scope_id = IP6CB(skb)->iif; } |