diff options
| author | David S. Miller <davem@davemloft.net> | 2018-08-23 03:01:51 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-11-11 03:55:11 +0300 |
| commit | 9e733177c71a81ae9be22dbacc79a0dd60a99f21 (patch) | |
| tree | 0a4ef88178c6b60457cb3e49453fda3f89e40143 | |
| parent | 4a5a553ddef76cbeb346414ddfd91aef8de07532 (diff) | |
| download | linux-9e733177c71a81ae9be22dbacc79a0dd60a99f21.tar.xz | |
iucv: Remove SKB list assumptions.
Eliminate the assumption that SKBs and SKB list heads can
be cast to eachother in SKB list handling code.
This change also appears to fix a bug since the list->next pointer is
sampled outside of holding the SKB queue lock.
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/iucv/af_iucv.c | 41 |
1 files changed, 15 insertions, 26 deletions
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c index 0bed4cc20603..78ea5a739d10 100644 --- a/net/iucv/af_iucv.c +++ b/net/iucv/af_iucv.c @@ -1873,30 +1873,26 @@ static void iucv_callback_txdone(struct iucv_path *path, struct sock *sk = path->private; struct sk_buff *this = NULL; struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; - struct sk_buff *list_skb = list->next; + struct sk_buff *list_skb; unsigned long flags; bh_lock_sock(sk); - if (!skb_queue_empty(list)) { - spin_lock_irqsave(&list->lock, flags); - while (list_skb != (struct sk_buff *)list) { - if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { - this = list_skb; - break; - } - list_skb = list_skb->next; + spin_lock_irqsave(&list->lock, flags); + skb_queue_walk(list, list_skb) { + if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { + this = list_skb; + break; } - if (this) - __skb_unlink(this, list); - - spin_unlock_irqrestore(&list->lock, flags); + } + if (this) + __skb_unlink(this, list); + spin_unlock_irqrestore(&list->lock, flags); - if (this) { - kfree_skb(this); - /* wake up any process waiting for sending */ - iucv_sock_wake_msglim(sk); - } + if (this) { + kfree_skb(this); + /* wake up any process waiting for sending */ + iucv_sock_wake_msglim(sk); } if (sk->sk_state == IUCV_CLOSING) { @@ -2284,11 +2280,7 @@ static void afiucv_hs_callback_txnotify(struct sk_buff *skb, list = &iucv->send_skb_q; spin_lock_irqsave(&list->lock, flags); - if (skb_queue_empty(list)) - goto out_unlock; - list_skb = list->next; - nskb = list_skb->next; - while (list_skb != (struct sk_buff *)list) { + skb_queue_walk_safe(list, list_skb, nskb) { if (skb_shinfo(list_skb) == skb_shinfo(skb)) { switch (n) { case TX_NOTIFY_OK: @@ -2321,10 +2313,7 @@ static void afiucv_hs_callback_txnotify(struct sk_buff *skb, } break; } - list_skb = nskb; - nskb = nskb->next; } -out_unlock: spin_unlock_irqrestore(&list->lock, flags); if (sk->sk_state == IUCV_CLOSING) { |