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From: Eric Auger <eric.auger@redhat.com>
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: [RFC 01/12] KVM: arm/arm64: Avoid multiple dist->spis kfree
Date: Mon, 19 Mar 2018 10:20:09 +0100	[thread overview]
Message-ID: <1521451220-27754-2-git-send-email-eric.auger@redhat.com> (raw)
In-Reply-To: <1521451220-27754-1-git-send-email-eric.auger@redhat.com>

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 twice and on
the second time it causes a "kernel BUG at mm/slub.c:3912!"

This patch avoids freeing dist->spis twice.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 virt/kvm/arm/vgic/vgic-init.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index 743ca5c..38fd5f1 100644
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -324,7 +324,10 @@ static void kvm_vgic_dist_destroy(struct kvm *kvm)
 	dist->ready = false;
 	dist->initialized = false;
 
-	kfree(dist->spis);
+	if (dist->spis) {
+		kfree(dist->spis);
+		dist->spis = NULL;
+	}
 	dist->nr_spis = 0;
 
 	if (vgic_supports_direct_msis(kvm))
-- 
2.5.5

  reply	other threads:[~2018-03-19  9:24 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-19  9:20 [RFC 00/12] KVM: arm/arm64: Allow multiple GICv3 redistributor regions Eric Auger
2018-03-19  9:20 ` Eric Auger [this message]
2018-03-19 13:46   ` [RFC 01/12] KVM: arm/arm64: Avoid multiple dist->spis kfree Marc Zyngier
2018-03-19 20:51     ` Auger Eric
2018-03-19  9:20 ` [RFC 02/12] KVM: arm/arm64: Document KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Eric Auger
2018-03-19 14:15   ` Marc Zyngier
2018-03-19 20:56     ` Auger Eric
2018-03-23 14:01   ` Peter Maydell
2018-03-19  9:20 ` [RFC 03/12] KVM: arm/arm64: Record RDIST Last bit at registration Eric Auger
2018-03-19 15:57   ` Marc Zyngier
2018-03-19 21:06     ` Auger Eric
2018-03-21 11:35       ` Marc Zyngier
2018-03-19  9:20 ` [RFC 04/12] KVM: arm/arm64: Replace the single rdist region by a list Eric Auger
2018-03-19  9:20 ` [RFC 05/12] KVM: arm/arm64: Helper to locate free rdist space Eric Auger
2018-03-19  9:20 ` [RFC 06/12] KVM: arm/arm64: Helper to detect whether an RDIST is the last one Eric Auger
2018-03-19  9:20 ` [RFC 07/12] KVM: arm/arm64: Helper to register a new redistributor region Eric Auger
2018-03-19  9:20 ` [RFC 08/12] KVM: arm/arm64: Adapt vgic_v3_check_base to multiple rdist regions Eric Auger
2018-03-19  9:20 ` [RFC 09/12] KVM: arm/arm64: Check vcpu redist base before registering an iodev Eric Auger
2018-03-19  9:20 ` [RFC 10/12] KVM: arm/arm64: Check all vcpu redistributors are set on map_resources Eric Auger
2018-03-19  9:20 ` [RFC 11/12] KVM: arm/arm64: Add KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Eric Auger
2018-03-19  9:20 ` [RFC 12/12] KVM: arm/arm64: Implement KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION Eric Auger

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