From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758749AbeD0QL4 (ORCPT ); Fri, 27 Apr 2018 12:11:56 -0400 Received: from mail-pf0-f195.google.com ([209.85.192.195]:41740 "EHLO mail-pf0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758565AbeD0QLx (ORCPT ); Fri, 27 Apr 2018 12:11:53 -0400 X-Google-Smtp-Source: AB8JxZp+ZXgCR79Xm+4jFQa+/3I49204F949pnNxIlHghRiRTCmYNZsZkkN1iXlS+DPtXiFtA4pjUs13wcTmI4vbsyw= MIME-Version: 1.0 In-Reply-To: <20180427185501-mutt-send-email-mst@kernel.org> References: <000000000000a5b2b1056a86e98c@google.com> <20180427154502.GA22544@la.guarana.org> <20180427185501-mutt-send-email-mst@kernel.org> From: Dmitry Vyukov Date: Fri, 27 Apr 2018 18:11:31 +0200 Message-ID: Subject: Re: [PATCH net] vhost: Use kzalloc() to allocate vhost_msg_node To: "Michael S. Tsirkin" Cc: Kevin Easton , Jason Wang , KVM list , virtualization@lists.linux-foundation.org, netdev , LKML , syzkaller-bugs Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Apr 27, 2018 at 6:05 PM, Michael S. Tsirkin wrote: > 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 >> Reported-by: syzbot+87cfa083e727a224754b@syzkaller.appspotmail.com > > Does it help if a patch naming the padding is applied, > and then we init just the relevant field? > Just curious. Yes, it would help. >> --- >> 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 > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/20180427185501-mutt-send-email-mst%40kernel.org. > For more options, visit https://groups.google.com/d/optout. From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Vyukov via Virtualization Subject: Re: [PATCH net] vhost: Use kzalloc() to allocate vhost_msg_node Date: Fri, 27 Apr 2018 18:11:31 +0200 Message-ID: References: <000000000000a5b2b1056a86e98c@google.com> <20180427154502.GA22544@la.guarana.org> <20180427185501-mutt-send-email-mst@kernel.org> Reply-To: Dmitry Vyukov Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Kevin Easton , KVM list , netdev , syzkaller-bugs , LKML , virtualization@lists.linux-foundation.org To: "Michael S. Tsirkin" Return-path: In-Reply-To: <20180427185501-mutt-send-email-mst@kernel.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org List-Id: netdev.vger.kernel.org On Fri, Apr 27, 2018 at 6:05 PM, Michael S. Tsirkin wrote: > 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 >> Reported-by: syzbot+87cfa083e727a224754b@syzkaller.appspotmail.com > > Does it help if a patch naming the padding is applied, > and then we init just the relevant field? > Just curious. Yes, it would help. >> --- >> 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 > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/20180427185501-mutt-send-email-mst%40kernel.org. > For more options, visit https://groups.google.com/d/optout.