treewide: Replace kmalloc with kmalloc_obj for non-scalar types

This is the result of running the Coccinelle script from
scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to
avoid scalar types (which need careful case-by-case checking), and
instead replace kmalloc-family calls that allocate struct or union
object instances:

Single allocations:	kmalloc(sizeof(TYPE), ...)
are replaced with:	kmalloc_obj(TYPE, ...)

Array allocations:	kmalloc_array(COUNT, sizeof(TYPE), ...)
are replaced with:	kmalloc_objs(TYPE, COUNT, ...)

Flex array allocations:	kmalloc(struct_size(PTR, FAM, COUNT), ...)
are replaced with:	kmalloc_flex(*PTR, FAM, COUNT, ...)

(where TYPE may also be *VAR)

The resulting allocations no longer return "void *", instead returning
"TYPE *".

Signed-off-by: Kees Cook <kees@kernel.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/kernel/kthread.c b/kernel/kthread.c
index c9507689e181..0b4f7328096f 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -122,7 +122,7 @@ bool set_kthread_struct(struct task_struct *p)
 	if (WARN_ON_ONCE(to_kthread(p)))
 		return false;
 
-	kthread = kzalloc(sizeof(*kthread), GFP_KERNEL);
+	kthread = kzalloc_obj(*kthread, GFP_KERNEL);
 	if (!kthread)
 		return false;
 
@@ -511,8 +511,7 @@ struct task_struct *__kthread_create_on_node(int (*threadfn)(void *data),
 {
 	DECLARE_COMPLETION_ONSTACK(done);
 	struct task_struct *task;
-	struct kthread_create_info *create = kmalloc(sizeof(*create),
-						     GFP_KERNEL);
+	struct kthread_create_info *create = kmalloc_obj(*create, GFP_KERNEL);
 
 	if (!create)
 		return ERR_PTR(-ENOMEM);
@@ -1084,7 +1083,7 @@ __kthread_create_worker_on_node(unsigned int flags, int node,
 	struct kthread_worker *worker;
 	struct task_struct *task;
 
-	worker = kzalloc(sizeof(*worker), GFP_KERNEL);
+	worker = kzalloc_obj(*worker, GFP_KERNEL);
 	if (!worker)
 		return ERR_PTR(-ENOMEM);