From: Eric Dumazet <edumazet@google.com>
Date: Thu, 26 Jan 2017 02:20:55 +0000 (-0800)
Subject: sysctl: fix proc_doulongvec_ms_jiffies_minmax()
X-Git-Tag: firefly_0821_release~176^2~4^2~2^2~19
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d1b232c2ce53d35dfb9c9e7447eeef42cea20e42;p=firefly-linux-kernel-4.4.55.git

sysctl: fix proc_doulongvec_ms_jiffies_minmax()

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@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 999e025bf68e..2f0d157258a2 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2414,6 +2414,7 @@ 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;