linux-kernel - [patch] tomoyo: fix potential use after free

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Date:	Sat, 13 Mar 2010 14:14:22 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Kentaro Takeda <takedakn@...data.co.jp>
Cc:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	James Morris <jmorris@...ei.org>,
	Serge Hallyn <serue@...ibm.com>,
	Toshiharu Harada <haradats@...data.co.jp>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] tomoyo: fix potential use after free

The original code returns a freed pointer.  This function is expected to 
return NULL on errors.

Signed-off-by: Dan Carpenter <error27@...il.com>

diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index ff51f10..ef89947 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -886,6 +886,7 @@ static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned
 	ptr = kmalloc(sizeof(*ptr), GFP_KERNEL);
 	if (!tomoyo_memory_ok(ptr)) {
 		kfree(ptr);
+		ptr = NULL;
 		goto ok;
 	}
 	for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++)
--
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