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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 41436C10F05 for ; Sat, 30 Mar 2019 01:08:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0A38A2184C for ; Sat, 30 Mar 2019 01:08:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553908134; bh=S5PeUGUAYe/Kz+Y3zj+oBMXsduxpAypjMN641UXFObk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=RKtu8xtftelw2AbcZjlCpAwTamKvA+ri7B0grGsfufhgVkD9l5QgoHMK37qe6vBqP LLSE/jYsSwWI5xppFSpye0SpeAK4V1bXhqP61S9DpixAh8Y7DZpM9h8P5QhudmAMER v/xiROUAn4NTz1cg5PNqqyvLczujvGdmnah+9eOE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730648AbfC3Awm (ORCPT ); Fri, 29 Mar 2019 20:52:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:59396 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730317AbfC3Awl (ORCPT ); Fri, 29 Mar 2019 20:52:41 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 06DAE218AC; Sat, 30 Mar 2019 00:52:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553907161; bh=S5PeUGUAYe/Kz+Y3zj+oBMXsduxpAypjMN641UXFObk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LknTNTIkfhX23GX8bggquQkorWICpG20z2swaDNn8hEK9orcqi50YdnFkTBdzVHLZ Vmcwey0FDxLQrmRfh61YIDvgoth/nDTNwRQc/tDFBsMHQUzyrREhJF/C3PaWqkBZnp KqBEYHBMKyOtQG8duK306gHJalTK1laaAykVI6Rw= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Kangjie Lu , Thomas Gleixner , pakki001@umn.edu, Haiyang Zhang , Stephen Hemminger , Sasha Levin , Borislav Petkov , "H. Peter Anvin" , linux-hyperv@vger.kernel.org Subject: [PATCH AUTOSEL 5.0 57/67] x86/hyperv: Prevent potential NULL pointer dereference Date: Fri, 29 Mar 2019 20:50:37 -0400 Message-Id: <20190330005047.25998-57-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190330005047.25998-1-sashal@kernel.org> References: <20190330005047.25998-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-hyperv-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org From: Kangjie Lu [ Upstream commit 534c89c22e26b183d838294f0937ee092c82ad3a ] The page allocation in hv_cpu_init() can fail, but the code does not have a check for that. Add a check and return -ENOMEM when the allocation fails. [ tglx: Massaged changelog ] Signed-off-by: Kangjie Lu Signed-off-by: Thomas Gleixner Reviewed-by: Mukesh Ojha Acked-by: "K. Y. Srinivasan" Cc: pakki001@umn.edu Cc: Haiyang Zhang Cc: Stephen Hemminger Cc: Sasha Levin Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: linux-hyperv@vger.kernel.org Link: https://lkml.kernel.org/r/20190314054651.1315-1-kjlu@umn.edu Signed-off-by: Sasha Levin --- arch/x86/hyperv/hv_init.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 7abb09e2eeb8..dfdb4ce1ae9c 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -102,9 +102,13 @@ static int hv_cpu_init(unsigned int cpu) u64 msr_vp_index; struct hv_vp_assist_page **hvp = &hv_vp_assist_page[smp_processor_id()]; void **input_arg; + struct page *pg; input_arg = (void **)this_cpu_ptr(hyperv_pcpu_input_arg); - *input_arg = page_address(alloc_page(GFP_KERNEL)); + pg = alloc_page(GFP_KERNEL); + if (unlikely(!pg)) + return -ENOMEM; + *input_arg = page_address(pg); hv_get_vp_index(msr_vp_index); -- 2.19.1