path: root/net/iucv/af_iucv.c
diff options
authorMathias Krause <minipli@googlemail.com>2013-04-07 01:51:54 +0000
committerDavid S. Miller <davem@davemloft.net>2013-04-07 16:28:01 -0400
commita5598bd9c087dc0efc250a5221e5d0e6f584ee88 (patch)
treeac7da3efc4748e0a2efb8e27aad0b4aae58e2c2e /net/iucv/af_iucv.c
parentirda: Fix missing msg_namelen update in irda_recvmsg_dgram() (diff)
iucv: Fix missing msg_namelen update in iucv_sock_recvmsg()
The current code does not fill the msg_name member in case it is set. It also does not set the msg_namelen member to 0 and therefore makes net/socket.c leak the local, uninitialized sockaddr_storage variable to userland -- 128 bytes of kernel stack memory. Fix that by simply setting msg_namelen to 0 as obviously nobody cared about iucv_sock_recvmsg() not filling the msg_name in case it was set. Cc: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/iucv/af_iucv.c')
1 files changed, 2 insertions, 0 deletions
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index a7d11ffe4284..bf6935820001 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -1328,6 +1328,8 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
struct sk_buff *skb, *rskb, *cskb;
int err = 0;
+ msg->msg_namelen = 0;
if ((sk->sk_state == IUCV_DISCONN) &&
skb_queue_empty(&iucv->backlog_skb_q) &&
skb_queue_empty(&sk->sk_receive_queue) &&