Patch "addrconf: always initialize sysctl table data" has been added to the 4.1-stable tree

Patch "addrconf: always initialize sysctl table data" has been added to the 4.1-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    addrconf: always initialize sysctl table data

to the 4.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     addrconf-always-initialize-sysctl-table-data.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Tue Jan 26 21:37:04 PST 2016
From: WANG Cong <xiyou.wangcong@gmail.com>
Date: Mon, 21 Dec 2015 10:55:45 -0800
Subject: addrconf: always initialize sysctl table data

From: WANG Cong <xiyou.wangcong@gmail.com>

[ Upstream commit 5449a5ca9bc27dd51a462de7ca0b1cd861cd2bd0 ]

When sysctl performs restrict writes, it allows to write from
a middle position of a sysctl file, which requires us to initialize
the table data before calling proc_dostring() for the write case.

Fixes: 3d1bec99320d ("ipv6: introduce secret_stable to ipv6_devconf")
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Tested-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv6/addrconf.c |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -5267,13 +5267,10 @@ static int addrconf_sysctl_stable_secret
 		goto out;
 	}
 
-	if (!write) {
-		err = snprintf(str, sizeof(str), "%pI6",
-			       &secret->secret);
-		if (err >= sizeof(str)) {
-			err = -EIO;
-			goto out;
-		}
+	err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
+	if (err >= sizeof(str)) {
+		err = -EIO;
+		goto out;
 	}
 
 	err = proc_dostring(&lctl, write, buffer, lenp, ppos);


Patches currently in stable-queue which might be from xiyou.wangcong@gmail.com are

queue-4.1/addrconf-always-initialize-sysctl-table-data.patch