From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:51740 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1031236AbeEXKDN (ORCPT ); Thu, 24 May 2018 06:03:13 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+7d26fc1eea198488deab@syzkaller.appspotmail.com, Alexander Potapenko , Douglas Gilbert , Johannes Thumshirn , "Martin K. Petersen" Subject: [PATCH 4.16 064/161] scsi: sg: allocate with __GFP_ZERO in sg_build_indirect() Date: Thu, 24 May 2018 11:38:09 +0200 Message-Id: <20180524093026.158541287@linuxfoundation.org> In-Reply-To: <20180524093018.331893860@linuxfoundation.org> References: <20180524093018.331893860@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alexander Potapenko commit a45b599ad808c3c982fdcdc12b0b8611c2f92824 upstream. This shall help avoid copying uninitialized memory to the userspace when calling ioctl(fd, SG_IO) with an empty command. Reported-by: syzbot+7d26fc1eea198488deab@syzkaller.appspotmail.com Cc: stable@vger.kernel.org Signed-off-by: Alexander Potapenko Acked-by: Douglas Gilbert Reviewed-by: Johannes Thumshirn Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman --- drivers/scsi/sg.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -1894,7 +1894,7 @@ retry: num = (rem_sz > scatter_elem_sz_prev) ? scatter_elem_sz_prev : rem_sz; - schp->pages[k] = alloc_pages(gfp_mask, order); + schp->pages[k] = alloc_pages(gfp_mask | __GFP_ZERO, order); if (!schp->pages[k]) goto out;