[PATCH v3 3/5] params: Use size_add() for kmalloc()

[Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>]

Prevent allocations from integer overflow by using size_add().

Reviewed-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
 kernel/params.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/params.c b/kernel/params.c
index f8e3c4139854..c3a029fe183d 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -11,6 +11,7 @@
 #include <linux/moduleparam.h>
 #include <linux/device.h>
 #include <linux/err.h>
+#include <linux/overflow.h>
 #include <linux/slab.h>
 #include <linux/ctype.h>
 #include <linux/security.h>
@@ -48,7 +49,7 @@ static void *kmalloc_parameter(unsigned int size)
 {
 	struct kmalloced_param *p;
 
-	p = kmalloc(sizeof(*p) + size, GFP_KERNEL);
+	p = kmalloc(size_add(sizeof(*p), size), GFP_KERNEL);
 	if (!p)
 		return NULL;
 
-- 
2.43.0.rc1.1.gbec44491f096