linux-kernel - [PATCH] lkdtm: Missing kmalloc check

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Message-Id: <1511452842-10680-1-git-send-email-gomonovych@gmail.com>
Date:   Thu, 23 Nov 2017 17:00:42 +0100
From:   Vasyl Gomonovych <gomonovych@...il.com>
To:     keescook@...omium.org, arnd@...db.de, gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, gomonovych@...il.com
Subject: [PATCH] lkdtm: Missing kmalloc check

Handling a possible memory allocation failure.

Signed-off-by: Vasyl Gomonovych <gomonovych@...il.com>
---
 drivers/misc/lkdtm_heap.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/misc/lkdtm_heap.c b/drivers/misc/lkdtm_heap.c
index f5494a6d4be5..65026d7de130 100644
--- a/drivers/misc/lkdtm_heap.c
+++ b/drivers/misc/lkdtm_heap.c
@@ -16,6 +16,8 @@ void lkdtm_OVERWRITE_ALLOCATION(void)
 {
 	size_t len = 1020;
 	u32 *data = kmalloc(len, GFP_KERNEL);
+	if (!data)
+		return;
 
 	data[1024 / sizeof(u32)] = 0x12345678;
 	kfree(data);
@@ -33,6 +35,8 @@ void lkdtm_WRITE_AFTER_FREE(void)
 	size_t offset = (len / sizeof(*base)) / 2;
 
 	base = kmalloc(len, GFP_KERNEL);
+	if (!base)
+		return;
 	pr_info("Allocated memory %p-%p\n", base, &base[offset * 2]);
 	pr_info("Attempting bad write to freed memory at %p\n",
 		&base[offset]);
-- 
1.9.1