linux-kernel - [PATCH AUTOSEL for 4.4 05/17] net/appletalk: Fix kernel memory disclosure

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Date:   Wed, 22 Nov 2017 22:24:22 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Vlad Tsyrklevich <vlad@...rklevich.net>,
        "David S . Miller" <davem@...emloft.net>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.4 05/17] net/appletalk: Fix kernel memory
 disclosure

From: Vlad Tsyrklevich <vlad@...rklevich.net>

[ Upstream commit ce7e40c432ba84da104438f6799d460a4cad41bc ]

ipddp_route structs contain alignment padding so kernel heap memory
is leaked when they are copied to user space in
ipddp_ioctl(SIOCFINDIPDDPRT). Change kmalloc() to kzalloc() to clear
that memory.

Signed-off-by: Vlad Tsyrklevich <vlad@...rklevich.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/net/appletalk/ipddp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/appletalk/ipddp.c b/drivers/net/appletalk/ipddp.c
index e90c6a7333d7..2e4649655181 100644
--- a/drivers/net/appletalk/ipddp.c
+++ b/drivers/net/appletalk/ipddp.c
@@ -191,7 +191,7 @@ static netdev_tx_t ipddp_xmit(struct sk_buff *skb, struct net_device *dev)
  */
 static int ipddp_create(struct ipddp_route *new_rt)
 {
-        struct ipddp_route *rt = kmalloc(sizeof(*rt), GFP_KERNEL);
+        struct ipddp_route *rt = kzalloc(sizeof(*rt), GFP_KERNEL);
 
         if (rt == NULL)
                 return -ENOMEM;
-- 
2.11.0