diff --git a/net/tipc/link.c b/net/tipc/link.c index a9d8a81e80cf..f25010261a9e 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -939,9 +939,7 @@ void tipc_link_reset(struct tipc_link *l) int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, struct sk_buff_head *xmitq) { - struct tipc_msg *hdr = buf_msg(skb_peek(list)); unsigned int maxwin = l->window; - int imp = msg_importance(hdr); unsigned int mtu = l->mtu; u16 ack = l->rcv_nxt - 1; u16 seqno = l->snd_nxt; @@ -950,8 +948,14 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, struct sk_buff_head *backlogq = &l->backlogq; struct sk_buff *skb, *_skb, **tskb; int pkt_cnt = skb_queue_len(list); + struct tipc_msg *hdr; int rc = 0; + int imp; + if (pkt_cnt <= 0) + return 0; + + hdr = buf_msg(skb_peek(list)); if (unlikely(msg_size(hdr) > mtu)) { pr_warn("Too large msg, purging xmit list %d %d %d %d %d!\n", skb_queue_len(list), msg_user(hdr), @@ -960,6 +964,7 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, return -EMSGSIZE; } + imp = msg_importance(hdr); /* Allow oversubscription of one data msg per source at congestion */ if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) { if (imp == TIPC_SYSTEM_IMPORTANCE) {