From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 05966C433E6 for ; Mon, 4 Jan 2021 16:11:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C6A7B20578 for ; Mon, 4 Jan 2021 16:11:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729277AbhADQKq (ORCPT ); Mon, 4 Jan 2021 11:10:46 -0500 Received: from mail.kernel.org ([198.145.29.99]:36580 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728307AbhADQAU (ORCPT ); Mon, 4 Jan 2021 11:00:20 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3DA7420769; Mon, 4 Jan 2021 16:00:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609776004; bh=xG67Zm/Pub3LnzeGF+mtGQjupBLMb7U8Wk+xH/2uKM4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HUOy3qTYNPGEb+VAq0Fmk/TATkJN8S72sIjUghFaYAIV6zamqMPeRfd7jJoAHFfbS Ipc2vE3oGWSgHKHHsvKtMJ/uy0RijnQss/3qnivS6zG1Sa/PcQweIQb3CUVt8/lOMS IhKhON1R+PwYzc6uZjIdL/giEYAx6IjGOBtyWHGI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+a79e17c39564bedf0930@syzkaller.appspotmail.com, Anant Thazhemadam Subject: [PATCH 5.4 27/47] misc: vmw_vmci: fix kernel info-leak by initializing dbells in vmci_ctx_get_chkpt_doorbells() Date: Mon, 4 Jan 2021 16:57:26 +0100 Message-Id: <20210104155707.054036333@linuxfoundation.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210104155705.740576914@linuxfoundation.org> References: <20210104155705.740576914@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Anant Thazhemadam commit 31dcb6c30a26d32650ce134820f27de3c675a45a upstream. A kernel-infoleak was reported by syzbot, which was caused because dbells was left uninitialized. Using kzalloc() instead of kmalloc() fixes this issue. Reported-by: syzbot+a79e17c39564bedf0930@syzkaller.appspotmail.com Tested-by: syzbot+a79e17c39564bedf0930@syzkaller.appspotmail.com Signed-off-by: Anant Thazhemadam Link: https://lore.kernel.org/r/20201122224534.333471-1-anant.thazhemadam@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/misc/vmw_vmci/vmci_context.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/misc/vmw_vmci/vmci_context.c +++ b/drivers/misc/vmw_vmci/vmci_context.c @@ -743,7 +743,7 @@ static int vmci_ctx_get_chkpt_doorbells( return VMCI_ERROR_MORE_DATA; } - dbells = kmalloc(data_size, GFP_ATOMIC); + dbells = kzalloc(data_size, GFP_ATOMIC); if (!dbells) return VMCI_ERROR_NO_MEM;