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/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index e96d0063cbcf..2f495e46034f 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -617,7 +617,7 @@ static int syscall_fault_buffer_enable(void)
 		return 0;
 	}
 
-	sbuf = kmalloc(sizeof(*sbuf), GFP_KERNEL);
+	sbuf = kmalloc_obj(*sbuf, GFP_KERNEL);
 	if (!sbuf)
 		return -ENOMEM;
 
@@ -1337,9 +1337,8 @@ void __init init_ftrace_syscalls(void)
 	void *ret;
 
 	if (!IS_ENABLED(CONFIG_HAVE_SPARSE_SYSCALL_NR)) {
-		syscalls_metadata = kcalloc(NR_syscalls,
-					sizeof(*syscalls_metadata),
-					GFP_KERNEL);
+		syscalls_metadata = kzalloc_objs(*syscalls_metadata,
+						 NR_syscalls, GFP_KERNEL);
 		if (!syscalls_metadata) {
 			WARN_ON(1);
 			return;