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

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Message-Id: <1469811580-32429-3-git-send-email-phil@nwl.cc>
Date:	Fri, 29 Jul 2016 18:59:39 +0200
From:	Phil Sutter <phil@....cc>
To:	David Miller <davem@...emloft.net>
Cc:	Xin Long <lucien.xin@...il.com>,
	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
	netdev@...r.kernel.org
Subject: [PATCH 2/3] sctp_diag: export timer value only if it is active

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 <phil@....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