diff --git a/net/tipc/link.c b/net/tipc/link.c index 06b880da2a8e..c92e6984933c 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -996,7 +996,6 @@ 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)); struct sk_buff_head *backlogq = &l->backlogq; struct sk_buff_head *transmq = &l->transmq; struct sk_buff *skb, *_skb; @@ -1004,13 +1003,18 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, u16 ack = l->rcv_nxt - 1; u16 seqno = l->snd_nxt; int pkt_cnt = skb_queue_len(list); - int imp = msg_importance(hdr); unsigned int mss = tipc_link_mss(l); unsigned int cwin = l->window; unsigned int mtu = l->mtu; + struct tipc_msg *hdr; bool new_bundle; 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), @@ -1019,6 +1023,7 @@ 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) {