From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752852AbeD3JHx (ORCPT ); Mon, 30 Apr 2018 05:07:53 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:44900 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752532AbeD3JHv (ORCPT ); Mon, 30 Apr 2018 05:07:51 -0400 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, marc.zyngier@arm.com, cdall@kernel.org, peter.maydell@linaro.org Cc: andre.przywara@arm.com, drjones@redhat.com, wei@redhat.com Subject: [PATCH v5 01/12] KVM: arm/arm64: Set dist->spis to NULL after kfree Date: Mon, 30 Apr 2018 11:07:33 +0200 Message-Id: <1525079264-25533-2-git-send-email-eric.auger@redhat.com> In-Reply-To: <1525079264-25533-1-git-send-email-eric.auger@redhat.com> References: <1525079264-25533-1-git-send-email-eric.auger@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org in case kvm_vgic_map_resources() fails, typically if the vgic distributor is not defined, __kvm_vgic_destroy will be called several times. Indeed kvm_vgic_map_resources() is called on first vcpu run. As a result dist->spis is freeed more than once and on the second time it causes a "kernel BUG at mm/slub.c:3912!" Set dist->spis to NULL to avoid the crash. Fixes: ad275b8bb1e6 ("KVM: arm/arm64: vgic-new: vgic_init: implement vgic_init") Signed-off-by: Eric Auger Reviewed-by: Marc Zyngier Reviewed-by: Christoffer Dall --- v2 -> v3: - added Marc's R-b and Fixed commit --- virt/kvm/arm/vgic/vgic-init.c | 1 + 1 file changed, 1 insertion(+) diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c index 68378fe..c52f03d 100644 --- a/virt/kvm/arm/vgic/vgic-init.c +++ b/virt/kvm/arm/vgic/vgic-init.c @@ -308,6 +308,7 @@ static void kvm_vgic_dist_destroy(struct kvm *kvm) dist->initialized = false; kfree(dist->spis); + dist->spis = NULL; dist->nr_spis = 0; if (vgic_supports_direct_msis(kvm)) -- 2.5.5