sctp_diag: Fix T3_rtx timer export

The asoc's timer value is not kept in asoc->timeouts array but in it's
primary transport instead.

Furthermore, we must export the timer only if it is pending, otherwise
the value will underrun when stored in an unsigned variable and
user space will only see a very large timeout value.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sctp/sctp_diag.c b/net/sctp/sctp_diag.c
index f69edcf219e514d864c4af2d57eb0429e8f4938a..f728ef04a7b2de394eaefa5347f1bb99944aad87 100644 (file)
--- a/net/sctp/sctp_diag.c
+++ b/net/sctp/sctp_diag.c
@@ -13,6 +13,7 @@ static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
 {
        union sctp_addr laddr, paddr;
        struct dst_entry *dst;
+       struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer;
 
        laddr = list_entry(asoc->base.bind_addr.address_list.next,
                           struct sctp_sockaddr_entry, list)->a;
@@ -40,10 +41,15 @@ static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
        }
 
        r->idiag_state = asoc->state;
-       r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
-       r->idiag_retrans = asoc->rtx_data_chunks;
-       r->idiag_expires = jiffies_to_msecs(
-               asoc->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX] - jiffies);
+       if (timer_pending(t3_rtx)) {
+               r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
+               r->idiag_retrans = asoc->rtx_data_chunks;
+               r->idiag_expires = jiffies_to_msecs(t3_rtx->expires - jiffies);
+       } else {
+               r->idiag_timer = 0;
+               r->idiag_retrans = 0;
+               r->idiag_expires = 0;
+       }
 }
 
 static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,