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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 5DD23C4743C for ; Mon, 21 Jun 2021 16:22:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4EC4C613B0 for ; Mon, 21 Jun 2021 16:22:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232043AbhFUQY2 (ORCPT ); Mon, 21 Jun 2021 12:24:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:42736 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231461AbhFUQWw (ORCPT ); Mon, 21 Jun 2021 12:22:52 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9FEA561380; Mon, 21 Jun 2021 16:20:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1624292418; bh=sO6GshCURRShh06c22Br7xjKQjBKp8JCcmikypymkVY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VJ/Y0X9xXieOqT2g+W+h6tkR8qMOM8tMp7JLbL6BkHv41a7dAyo149YWQgkbGKDW6 zEvu+N/7tDOVm9MqmR+1eF8KN/GlyEAUIHE7GBrWMjj9om9972XAbGk7Qk3ibSPZIq ERHF+Vogj4GtxhEJoxHHczq8lG1URDx7J2yn1IA8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Auger , Gavin Shan , Marc Zyngier , Stable@vger.kernel.org Subject: [PATCH 5.4 84/90] KVM: arm/arm64: Fix KVM_VGIC_V3_ADDR_TYPE_REDIST read Date: Mon, 21 Jun 2021 18:15:59 +0200 Message-Id: <20210621154906.999752006@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210621154904.159672728@linuxfoundation.org> References: <20210621154904.159672728@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: Eric Auger commit 94ac0835391efc1a30feda6fc908913ec012951e upstream. When reading the base address of the a REDIST region through KVM_VGIC_V3_ADDR_TYPE_REDIST we expect the redistributor region list to be populated with a single element. However list_first_entry() expects the list to be non empty. Instead we should use list_first_entry_or_null which effectively returns NULL if the list is empty. Fixes: dbd9733ab674 ("KVM: arm/arm64: Replace the single rdist region by a list") Cc: # v4.18+ Signed-off-by: Eric Auger Reported-by: Gavin Shan Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20210412150034.29185-1-eric.auger@redhat.com Signed-off-by: Greg Kroah-Hartman --- virt/kvm/arm/vgic/vgic-kvm-device.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/virt/kvm/arm/vgic/vgic-kvm-device.c +++ b/virt/kvm/arm/vgic/vgic-kvm-device.c @@ -87,8 +87,8 @@ int kvm_vgic_addr(struct kvm *kvm, unsig r = vgic_v3_set_redist_base(kvm, 0, *addr, 0); goto out; } - rdreg = list_first_entry(&vgic->rd_regions, - struct vgic_redist_region, list); + rdreg = list_first_entry_or_null(&vgic->rd_regions, + struct vgic_redist_region, list); if (!rdreg) addr_ptr = &undef_value; else