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Date: Fri, 27 Apr 2018 19:05:45 +0300 From: "Michael S. Tsirkin" <mst@...hat.com> To: Kevin Easton <kevin@...rana.org> Cc: Jason Wang <jasowang@...hat.com>, kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [PATCH net] vhost: Use kzalloc() to allocate vhost_msg_node On Fri, Apr 27, 2018 at 11:45:02AM -0400, Kevin Easton wrote: > The struct vhost_msg within struct vhost_msg_node is copied to userspace, > so it should be allocated with kzalloc() to ensure all structure padding > is zeroed. > > Signed-off-by: Kevin Easton <kevin@...rana.org> > Reported-by: syzbot+87cfa083e727a224754b@...kaller.appspotmail.com Does it help if a patch naming the padding is applied, and then we init just the relevant field? Just curious. > --- > drivers/vhost/vhost.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > index f3bd8e9..1b84dcff 100644 > --- a/drivers/vhost/vhost.c > +++ b/drivers/vhost/vhost.c > @@ -2339,7 +2339,7 @@ EXPORT_SYMBOL_GPL(vhost_disable_notify); > /* Create a new message. */ > struct vhost_msg_node *vhost_new_msg(struct vhost_virtqueue *vq, int type) > { > - struct vhost_msg_node *node = kmalloc(sizeof *node, GFP_KERNEL); > + struct vhost_msg_node *node = kzalloc(sizeof *node, GFP_KERNEL); > if (!node) > return NULL; > node->vq = vq; > -- > 2.8.1
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