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 2ee3b3d..a891705 100644 (file)
--- 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);
        }