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

[Vlad Tsyrklevich <vlad@tsyrklevich.net>]

Clear the 'unused' field to avoid leaking memory to userland in
copy_result_to_user().

Signed-off-by: Vlad Tsyrklevich <vlad@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..0570711 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -138,6 +138,8 @@ static void compat_output(struct dlm_lock_result *res,
 	res32->lksb.sb_flags = res->lksb.sb_flags;
 	res32->lksb.sb_lkid = res->lksb.sb_lkid;
 	res32->lksb.sb_lvbptr = (__u32)(long)res->lksb.sb_lvbptr;
+
+	memset(&res32->unused, 0, sizeof(res32->unused));
 }
 #endif
 
-- 
2.7.0