[PATCH 2/3] sctp_diag: export timer value only if it is active

[Phil Sutter]

Since it is exported as unsigned value, userspace has no way detecting
whether it is negative or just very large. Therefore do this in kernel
space where it is a simple comparison.

Signed-off-by: Phil Sutter <p...@nwl.cc>
---
 net/sctp/sctp_diag.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/net/sctp/sctp_diag.c b/net/sctp/sctp_diag.c
index f69edcf219e51..0ad6033a7330c 100644
--- a/net/sctp/sctp_diag.c
+++ b/net/sctp/sctp_diag.c
@@ -40,10 +40,12 @@ 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 (asoc->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX] > jiffies) {
+               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);
+       }
 }
 
 static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
-- 
2.8.2