From: Xiu Jianfeng <xiujianfeng@huawei.com>
Date: Tue, 14 Jun 2022 09:00:01 +0000 (+0800)
Subject: apparmor: Fix memleak in aa_simple_write_to_buffer()
X-Git-Tag: v5.10.138~138
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8aab4295582eb397a125d2788b829fa62b88dbf7;p=thirdparty%2Fkernel%2Fstable.git

apparmor: Fix memleak in aa_simple_write_to_buffer()

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@huawei.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index 5fd4a64e431f6..c173f6fd7aeed 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -401,7 +401,7 @@ static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
 
 	data->size = copy_size;
 	if (copy_from_user(data->data, userbuf, copy_size)) {
-		kvfree(data);
+		aa_put_loaddata(data);
 		return ERR_PTR(-EFAULT);
 	}