diff options
author | Jason Wang <jasowang@redhat.com> | 2019-04-09 12:10:25 +0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-27 09:35:34 +0200 |
commit | f052bafe5476347fe9ae0665c4d2297ad1301e38 (patch) | |
tree | 479bb877d79a6853fea4b7e6d77999f87d19388a /drivers/vhost | |
parent | b205097fae230acfe7a928e7f4875148568667bd (diff) |
vhost: reject zero size iova range
[ Upstream commit 813dbeb656d6c90266f251d8bd2b02d445afa63f ]
We used to accept zero size iova range which will lead a infinite loop
in translate_desc(). Fixing this by failing the request in this case.
Reported-by: syzbot+d21e6e297322a900c128@syzkaller.appspotmail.com
Fixes: 6b1e6cc7 ("vhost: new device IOTLB API")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/vhost')
-rw-r--r-- | drivers/vhost/vhost.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index d7c22ae5c368..0e93ac888a5f 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -918,8 +918,12 @@ static int vhost_new_umem_range(struct vhost_umem *umem, u64 start, u64 size, u64 end, u64 userspace_addr, int perm) { - struct vhost_umem_node *tmp, *node = kmalloc(sizeof(*node), GFP_ATOMIC); + struct vhost_umem_node *tmp, *node; + if (!size) + return -EFAULT; + + node = kmalloc(sizeof(*node), GFP_ATOMIC); if (!node) return -ENOMEM; |