netdev - [PATCH 3/6] vhost: fix vhost map leak

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190723075718.6275-4-jasowang@redhat.com>
Date:   Tue, 23 Jul 2019 03:57:15 -0400
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/6] vhost: fix vhost map leak

We don't free map during vhost_map_unprefetch(). This means it could
be leaked. Fixing by free the map.

Reported-by: Michael S. Tsirkin <mst@...hat.com>
Fixes: 7f466032dc9e ("vhost: access vq metadata through kernel virtual address")
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/vhost/vhost.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 058191d5efad..03666b702498 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -303,9 +303,7 @@ static void vhost_vq_meta_reset(struct vhost_dev *d)
 static void vhost_map_unprefetch(struct vhost_map *map)
 {
 	kfree(map->pages);
-	map->pages = NULL;
-	map->npages = 0;
-	map->addr = NULL;
+	kfree(map);
 }
 
 static void vhost_uninit_vq_maps(struct vhost_virtqueue *vq)
-- 
2.18.1