From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
To: Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Kees Cook <keescook@chromium.org>
Cc: linux-kernel@vger.kernel.org,
Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Subject: [PATCH 1/2] lkdtm: fix memory leak of val
Date: Tue, 5 Apr 2016 22:41:05 +0530 [thread overview]
Message-ID: <1459876266-18023-1-git-send-email-sudipm.mukherjee@gmail.com> (raw)
This case is supposed to read from a page after after it is freed, but
it missed freeing val if we are not able to get a free page.
Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
---
drivers/misc/lkdtm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c
index 5f1a36b..2f0b022 100644
--- a/drivers/misc/lkdtm.c
+++ b/drivers/misc/lkdtm.c
@@ -498,12 +498,13 @@ static void lkdtm_do_action(enum ctype which)
}
case CT_READ_BUDDY_AFTER_FREE: {
unsigned long p = __get_free_page(GFP_KERNEL);
- int saw, *val = kmalloc(1024, GFP_KERNEL);
+ int saw, *val;
int *base;
if (!p)
break;
+ val = kmalloc(1024, GFP_KERNEL);
if (!val)
break;
--
1.9.1
next reply other threads:[~2016-04-05 17:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-05 17:11 Sudip Mukherjee [this message]
2016-04-05 17:11 ` [PATCH 2/2] lkdtm: fix memory leak of base Sudip Mukherjee
2016-04-06 22:49 ` Kees Cook
2016-04-06 22:48 ` [PATCH 1/2] lkdtm: fix memory leak of val Kees Cook
2016-04-06 22:53 ` Kees Cook
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