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authorHendrik Brueckner <brueckner@linux.vnet.ibm.com>2009-04-21 10:04:21 +0400
committerDavid S. Miller <davem@davemloft.net>2009-04-22 10:43:13 +0400
commit60d3705fcbfe7deca8e94bc7ddecd6f9f1a4647e (patch)
treeafd8b424d6a8367ebca081e103a035ca346f88f9 /net/iucv/af_iucv.c
parentbbe188c8f16effd902d1ad391e06e41ce649b22e (diff)
downloadlinux-60d3705fcbfe7deca8e94bc7ddecd6f9f1a4647e.tar.xz
af_iucv: fix oops in iucv_sock_recvmsg() for MSG_PEEK flag
If iucv_sock_recvmsg() is called with MSG_PEEK flag set, the skb is enqueued twice. If the socket is then closed, the pointer to the skb is freed twice. Remove the skb_queue_head() call for MSG_PEEK, because the skb_recv_datagram() function already handles MSG_PEEK (does not dequeue the skb). Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/iucv/af_iucv.c')
-rw-r--r--net/iucv/af_iucv.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 2941ee50393b..42b3be302c57 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -814,6 +814,8 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
+ /* receive/dequeue next skb:
+ * the function understands MSG_PEEK and, thus, does not dequeue skb */
skb = skb_recv_datagram(sk, flags, noblock, &err);
if (!skb) {
if (sk->sk_shutdown & RCV_SHUTDOWN)
@@ -861,9 +863,7 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
iucv_process_message_q(sk);
spin_unlock_bh(&iucv->message_q.lock);
}
-
- } else
- skb_queue_head(&sk->sk_receive_queue, skb);
+ }
done:
return err ? : copied;