tipc: refactor node xmit and fix memory leaks
Refactor tipc_node_xmit() to fail fast and fail early. Fix several potential memory leaks in unexpected error paths. Reported-by: Dmitry Vyukov <dvyukov@google.com> Reviewed-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: Richard Alpe <richard.alpe@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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4952cd3e7b
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@ -903,8 +903,10 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
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if (unlikely(l->backlog[i].len >= l->backlog[i].limit))
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return link_schedule_user(l, list);
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}
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if (unlikely(msg_size(hdr) > mtu))
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if (unlikely(msg_size(hdr) > mtu)) {
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skb_queue_purge(list);
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return -EMSGSIZE;
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}
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/* Prepare each packet for sending, and add to relevant queue: */
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while (skb_queue_len(list)) {
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@ -916,8 +918,10 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
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if (likely(skb_queue_len(transmq) < maxwin)) {
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_skb = skb_clone(skb, GFP_ATOMIC);
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if (!_skb)
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if (!_skb) {
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skb_queue_purge(list);
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return -ENOBUFS;
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}
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__skb_dequeue(list);
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__skb_queue_tail(transmq, skb);
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__skb_queue_tail(xmitq, _skb);
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@ -1166,7 +1166,7 @@ msg_full:
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* @dnode: address of destination node
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* @selector: a number used for deterministic link selection
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* Consumes the buffer chain, except when returning -ELINKCONG
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* Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
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* Returns 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF
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*/
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int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
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u32 dnode, int selector)
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@ -1174,33 +1174,43 @@ int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
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struct tipc_link_entry *le = NULL;
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struct tipc_node *n;
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struct sk_buff_head xmitq;
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int bearer_id = -1;
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int rc = -EHOSTUNREACH;
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int bearer_id;
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int rc;
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__skb_queue_head_init(&xmitq);
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n = tipc_node_find(net, dnode);
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if (likely(n)) {
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tipc_node_read_lock(n);
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bearer_id = n->active_links[selector & 1];
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if (bearer_id >= 0) {
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le = &n->links[bearer_id];
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spin_lock_bh(&le->lock);
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rc = tipc_link_xmit(le->link, list, &xmitq);
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spin_unlock_bh(&le->lock);
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}
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tipc_node_read_unlock(n);
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if (likely(!rc))
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tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
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else if (rc == -ENOBUFS)
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tipc_node_link_down(n, bearer_id, false);
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tipc_node_put(n);
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return rc;
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}
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if (likely(in_own_node(net, dnode))) {
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if (in_own_node(net, dnode)) {
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tipc_sk_rcv(net, list);
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return 0;
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}
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n = tipc_node_find(net, dnode);
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if (unlikely(!n)) {
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skb_queue_purge(list);
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return -EHOSTUNREACH;
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}
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tipc_node_read_lock(n);
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bearer_id = n->active_links[selector & 1];
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if (unlikely(bearer_id == INVALID_BEARER_ID)) {
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tipc_node_read_unlock(n);
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tipc_node_put(n);
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skb_queue_purge(list);
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return -EHOSTUNREACH;
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}
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__skb_queue_head_init(&xmitq);
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le = &n->links[bearer_id];
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spin_lock_bh(&le->lock);
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rc = tipc_link_xmit(le->link, list, &xmitq);
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spin_unlock_bh(&le->lock);
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tipc_node_read_unlock(n);
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if (likely(rc == 0))
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tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
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else if (rc == -ENOBUFS)
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tipc_node_link_down(n, bearer_id, false);
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tipc_node_put(n);
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return rc;
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}
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