From d2e10088ce01191748857296999b8c24a9a51959 Mon Sep 17 00:00:00 2001
From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Date: Tue, 5 Apr 2016 22:41:06 +0530
Subject: [PATCH] lkdtm: fix memory leak of base

This case is supposed to read from a memory after it has been freed,
but we missed freeing base if the memory 'val' could not be allocated.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/misc/lkdtm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c
index 2f0b02248761..5b3a63c87ec9 100644
--- a/drivers/misc/lkdtm.c
+++ b/drivers/misc/lkdtm.c
@@ -458,8 +458,10 @@ static void lkdtm_do_action(enum ctype which)
 			break;
 
 		val = kmalloc(len, GFP_KERNEL);
-		if (!val)
+		if (!val) {
+			kfree(base);
 			break;
+		}
 
 		*val = 0x12345678;
 		base[offset] = *val;