linux-kernel - [PATCH v1] lkdtm/fortify: Check for NULL return of kmalloc()

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Message-Id: <1648115059-12026-1-git-send-email-unSimple1993@163.com>
Date:   Thu, 24 Mar 2022 17:44:19 +0800
From:   QintaoShen <unSimple1993@....com>
To:     keescook@...omium.org
Cc:     linux-kernel@...r.kernel.org, QintaoShen <unSimple1993@....com>
Subject: [PATCH v1] lkdtm/fortify: Check for NULL return of kmalloc()

The memory allocation function kmalloc() may return a NULL pointer.
If 'src' is NULL, the strscpy() would copy the string to a NULL address.

Therefore, it is better to check the return value of kmalloc() to avoid the confusion.

Signed-off-by: QintaoShen <unSimple1993@....com>
---
 drivers/misc/lkdtm/fortify.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/misc/lkdtm/fortify.c b/drivers/misc/lkdtm/fortify.c
index ab33bb5..93eeaef 100644
--- a/drivers/misc/lkdtm/fortify.c
+++ b/drivers/misc/lkdtm/fortify.c
@@ -41,6 +41,9 @@ void lkdtm_FORTIFIED_SUBOBJECT(void)
 	char *src;
 
 	src = kmalloc(size, GFP_KERNEL);
+	if (!src)
+		return ;
+
 	strscpy(src, "over ten bytes", size);
 	size = strlen(src) + 1;
 
-- 
2.7.4