linux-kernel - [PATCH] lkdtm: fortify: Fix potential NULL dereference on kmalloc failure

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Message-ID: <20250814060605.5264-1-junjie.cao@intel.com>
Date: Thu, 14 Aug 2025 14:06:05 +0800
From: Junjie Cao <junjie.cao@...el.com>
To: Kees Cook <kees@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org,
	Junjie Cao <junjie.cao@...el.com>
Subject: [PATCH] lkdtm: fortify: Fix potential NULL dereference on kmalloc failure

Add missing NULL pointer checks after kmalloc() calls in
lkdtm_FORTIFY_STR_MEMBER() and lkdtm_FORTIFY_MEM_MEMBER() functions.

Signed-off-by: Junjie Cao <junjie.cao@...el.com>
---
 drivers/misc/lkdtm/fortify.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/misc/lkdtm/fortify.c b/drivers/misc/lkdtm/fortify.c
index 015927665678..715598226037 100644
--- a/drivers/misc/lkdtm/fortify.c
+++ b/drivers/misc/lkdtm/fortify.c
@@ -44,6 +44,10 @@ static void lkdtm_FORTIFY_STR_MEMBER(void)
 	char *src;
 
 	src = kmalloc(size, GFP_KERNEL);
+
+	if (src == NULL)
+		return;
+
 	strscpy(src, "over ten bytes", size);
 	size = strlen(src) + 1;
 
@@ -109,6 +113,10 @@ static void lkdtm_FORTIFY_MEM_MEMBER(void)
 	char *src;
 
 	src = kmalloc(size, GFP_KERNEL);
+
+	if (src == NULL)
+		return;
+
 	strscpy(src, "over ten bytes", size);
 	size = strlen(src) + 1;
 
-- 
2.43.0