linux-kernel - [PATCH 3.10 129/268] sysctl: fix proc_doulongvec_ms_jiffies

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Message-Id: <1497897167-14556-130-git-send-email-w@1wt.eu>
Date:   Mon, 19 Jun 2017 20:30:28 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 129/268] sysctl: fix proc_doulongvec_ms_jiffies_minmax()

From: Eric Dumazet <edumazet@...gle.com>

commit ff9f8a7cf935468a94d9927c68b00daae701667e upstream.

We perform the conversion between kernel jiffies and ms only when
exporting kernel value to user space.

We need to do the opposite operation when value is written by user.

Only matters when HZ != 1000

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 kernel/sysctl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 4fd49fe..430725d 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2224,6 +2224,7 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int
 				break;
 			if (neg)
 				continue;
+			val = convmul * val / convdiv;
 			if ((min && val < *min) || (max && val > *max))
 				continue;
 			*i = val;
-- 
2.8.0.rc2.1.gbe9624a