[PATCH 3.18 05/22] irda: do not leak initialized list.dev to userspace

Greg Kroah-Hartman
2017-08-28T08:16:57Z

From: Colin Ian King <colin.king@canonical.com>

[ Upstream commit b024d949a3c24255a7ef1a470420eb478949aa4c ]

list.dev has not been initialized and so the copy_to_user is copying
data from the stack back to user space which is a potential
information leak. Fix this ensuring all of list is initialized to
zero.

Detected by CoverityScan, CID#1357894 ("Uninitialized scalar variable")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/irda/af_irda.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/irda/af_irda.c
+++ b/net/irda/af_irda.c
@@ -2251,7 +2251,7 @@ static int irda_getsockopt(struct socket
{
struct sock *sk = sock->sk;
struct irda_sock *self = irda_sk(sk);
- struct irda_device_list list;
+ struct irda_device_list list = { 0 };
struct irda_device_info *discoveries;
struct irda_ias_set * ias_opt; /* IAS get/query params */
struct ias_object * ias_obj; /* Object in IAS */