From: Vlad Tsyrklevich <vlad@tsyrklevich.net>
Date: Wed, 22 Feb 2017 21:31:45 +0000 (-0600)
Subject: dlm: Fix kernel memory disclosure
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8286d6b14c7c0e2c52d565a8727f6028a487fcf0;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

dlm: Fix kernel memory disclosure

Clear the 'unused' field and the uninitialized padding in 'lksb' to
avoid leaking memory to userland in copy_result_to_user().

Signed-off-by: Vlad Tsyrklevich <vlad@tsyrklevich.net>
Signed-off-by: David Teigland <teigland@redhat.com>
---

diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index 23488f559cf9..322a6bcd70a2 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -123,6 +123,8 @@ static void compat_input(struct dlm_write_request *kb,
 static void compat_output(struct dlm_lock_result *res,
 			  struct dlm_lock_result32 *res32)
 {
+	memset(res32, 0, sizeof(*res32));
+
 	res32->version[0] = res->version[0];
 	res32->version[1] = res->version[1];
 	res32->version[2] = res->version[2];