param: fix uninitialized read with CONFIG_DEBUG_LOCK_ALLOC

ignore_lockdep is uninitialized, and sysfs_attr_init() doesn't initialize
it, so memset to 0.

Reported-by: Huang Ying <ying.huang@intel.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 1 insertions, 0 deletions

diff --git a/kernel/params.c b/kernel/params.c
index bd65d136a470..728e05b167de 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -642,6 +642,7 @@ static __modinit int add_sysfs_param(struct module_kobject *mk,
         mk->mp->grp.attrs = new_attrs;
 
         /* Tack new one on the end. */
+        memset(&mk->mp->attrs[mk->mp->num], 0, sizeof(mk->mp->attrs[0]));
         sysfs_attr_init(&mk->mp->attrs[mk->mp->num].mattr.attr);
         mk->mp->attrs[mk->mp->num].param = kp;
         mk->mp->attrs[mk->mp->num].mattr.show = param_attr_show;