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Message-Id: <1524838505-3823-2-git-send-email-eric.auger@redhat.com>
Date: Fri, 27 Apr 2018 16:14:54 +0200
From: Eric Auger <eric.auger@...hat.com>
To: eric.auger.pro@...il.com, eric.auger@...hat.com,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
kvmarm@...ts.cs.columbia.edu, marc.zyngier@....com,
cdall@...nel.org, peter.maydell@...aro.org
Cc: andre.przywara@....com, drjones@...hat.com, wei@...hat.com
Subject: [PATCH v4 01/12] KVM: arm/arm64: Set dist->spis to NULL after kfree
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 <eric.auger@...hat.com>
Reviewed-by: Marc Zyngier <marc.zyngier@....com>
Reviewed-by: Christoffer Dall <christoffer.dall@....com>
---
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
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