linux-kernel - [PATCH v3 3/5] params: Use size

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Message-ID: <20231120151419.1661807-4-andriy.shevchenko@linux.intel.com>
Date:   Mon, 20 Nov 2023 17:11:44 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH v3 3/5] params: Use size_add() for kmalloc()

Prevent allocations from integer overflow by using size_add().

Reviewed-by: Luis Chamberlain <mcgrof@...nel.org>
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 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