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Thu, 28 Nov 2019 03:49:13 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 82A62107ACE3; Thu, 28 Nov 2019 08:49:10 +0000 (UTC) Received: from [10.36.116.37] (ovpn-116-37.ams2.redhat.com [10.36.116.37]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DB6AD60C80; Thu, 28 Nov 2019 08:49:03 +0000 (UTC) Subject: Re: [PATCH] KVM: vgic: Fix potential double free dist->spis in __kvm_vgic_destroy() To: linmiaohe , maz@kernel.org, pbonzini@redhat.com, rkrcmar@redhat.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, christoffer.dall@arm.com, catalin.marinas@arm.com, gregkh@linuxfoundation.org, will@kernel.org, andre.przywara@arm.com, tglx@linutronix.de References: <1574923128-19956-1-git-send-email-linmiaohe@huawei.com> From: Auger Eric Message-ID: <115fbbb3-73d5-444a-0aec-61bca0dea435@redhat.com> Date: Thu, 28 Nov 2019 09:49:02 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <1574923128-19956-1-git-send-email-linmiaohe@huawei.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: k1I8B9FENh-njGBz-WF6VQ-1 X-Mimecast-Spam-Score: 0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191128_004917_112430_F97A5912 X-CRM114-Status: GOOD ( 16.29 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, On 11/28/19 7:38 AM, linmiaohe wrote: > From: Miaohe Lin > > In kvm_vgic_dist_init() called from kvm_vgic_map_resources(), if > dist->vgic_model is invalid, dist->spis will be freed without set > dist->spis = NULL. And in vgicv2 resources clean up path, > __kvm_vgic_destroy() will be called to free allocated resources. > And dist->spis will be freed again in clean up chain because we > forget to set dist->spis = NULL in kvm_vgic_dist_init() failed > path. So double free would happen. > > Signed-off-by: Miaohe Lin Reviewed-by: Eric Auger Thanks Eric > --- > 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 53e3969dfb52..c17c29beeb72 100644 > --- a/virt/kvm/arm/vgic/vgic-init.c > +++ b/virt/kvm/arm/vgic/vgic-init.c > @@ -171,6 +171,7 @@ static int kvm_vgic_dist_init(struct kvm *kvm, unsigned int nr_spis) > break; > default: > kfree(dist->spis); > + dist->spis = NULL; > return -EINVAL; > } > } > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel