[Cluster-devel] [PATCH v2] fs/dlm: Fix kernel memory disclosure

[Vlad Tsyrklevich]

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 at tsyrklevich.net>
---
 fs/dlm/user.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index 1ce908c..83ddd47 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -122,6 +122,8 @@ 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];
-- 
2.7.0