linux-kernel - [PATCH 4.19 229/287] apparmor: Fix memleak in aa_simple_write_to

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Message-Id: <20220823080108.728228207@linuxfoundation.org>
Date:   Tue, 23 Aug 2022 10:26:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Xiu Jianfeng <xiujianfeng@...wei.com>,
        John Johansen <john.johansen@...onical.com>
Subject: [PATCH 4.19 229/287] apparmor: Fix memleak in aa_simple_write_to_buffer()

From: Xiu Jianfeng <xiujianfeng@...wei.com>

commit 417ea9fe972d2654a268ad66e89c8fcae67017c3 upstream.

When copy_from_user failed, the memory is freed by kvfree. however the
management struct and data blob are allocated independently, so only
kvfree(data) cause a memleak issue here. Use aa_put_loaddata(data) to
fix this issue.

Fixes: a6a52579e52b5 ("apparmor: split load data into management struct and data blob")
Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
Signed-off-by: John Johansen <john.johansen@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 security/apparmor/apparmorfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -403,7 +403,7 @@ static struct aa_loaddata *aa_simple_wri
 
 	data->size = copy_size;
 	if (copy_from_user(data->data, userbuf, copy_size)) {
-		kvfree(data);
+		aa_put_loaddata(data);
 		return ERR_PTR(-EFAULT);
 	}