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authorUrsula Braun <braunu@de.ibm.com>2008-02-07 18:07:19 -0800
committerDavid S. Miller <davem@davemloft.net>2008-02-07 18:07:19 -0800
commitd44447229e35115675d166b51a52e512c281475c (patch)
treeb968431fddcbb21fe0c3278c7545c22bdc2be4a4 /net/iucv
parent435bc9dfc6927eed9465e297d7aca1217aa61956 (diff)
[AF_IUCV]: broken send_skb_q results in endless loop
A race has been detected in iucv_callback_txdone(). skb_unlink has to be done inside the locked area. In addition checkings for successful allocations are inserted. Signed-off-by: Ursula Braun <braunu@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/iucv')
-rw-r--r--net/iucv/af_iucv.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 2255e3c082ed..b3f5f840d067 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -482,6 +482,10 @@ static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
/* Create path. */
iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT,
IPRMDATA, GFP_KERNEL);
+ if (!iucv->path) {
+ err = -ENOMEM;
+ goto done;
+ }
err = iucv_path_connect(iucv->path, &af_iucv_handler,
sa->siucv_user_id, NULL, user_data, sk);
if (err) {
@@ -1094,6 +1098,8 @@ static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
save_message:
save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
+ if (!save_msg)
+ return;
save_msg->path = path;
save_msg->msg = *msg;
@@ -1118,10 +1124,10 @@ static void iucv_callback_txdone(struct iucv_path *path,
this = list_skb;
list_skb = list_skb->next;
} while (memcmp(&msg->tag, this->cb, 4) && list_skb);
+ __skb_unlink(this, list);
spin_unlock_irqrestore(&list->lock, flags);
- skb_unlink(this, &iucv_sk(sk)->send_skb_q);
kfree_skb(this);
}

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