lkml.org 
[lkml]   [2018]   [Mar]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC v2 01/12] KVM: arm/arm64: Set dist->spis to NULL after kfree
Date
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.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
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 743ca5c..3349f2b 100644
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -325,6 +325,7 @@ 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
\
 
 \ /
  Last update: 2018-03-27 16:09    [W:0.156 / U:0.572 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site