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arm/arm64: KVM: Fix set_clear_sgi_pend_reg offset

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The sgi values calculated in read_set_clear_sgi_pend_reg() and
write_set_clear_sgi_pend_reg() were horribly incorrectly multiplied by 4
with catastrophic results in that subfunctions ended up overwriting
memory not allocated for the expected purpose.

This showed up as bugs in kfree() and the kernel complaining a lot of
you turn on memory debugging.

This addresses: http://marc.info/?l=kvm&m=141164910007868&w=2

Reported-by: Shannon Zhao <[email protected]>
Signed-off-by: Christoffer Dall <[email protected]>
This commit is contained in:
Christoffer Dall 2014-09-25 18:41:07 +02:00
commit 0fea6d7628
1 changed files with 2 additions and 2 deletions
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4
virt/kvm/arm/vgic.c
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@ -816,7 +816,7 @@ static bool read_set_clear_sgi_pend_reg(struct kvm_vcpu *vcpu,
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
int sgi;
int min_sgi = (offset & ~0x3) * 4;
int min_sgi = (offset & ~0x3);
int max_sgi = min_sgi + 3;
int vcpu_id = vcpu->vcpu_id;
u32 reg = 0;
@ -837,7 +837,7 @@ static bool write_set_clear_sgi_pend_reg(struct kvm_vcpu *vcpu,
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
int sgi;
int min_sgi = (offset & ~0x3) * 4;
int min_sgi = (offset & ~0x3);
int max_sgi = min_sgi + 3;
int vcpu_id = vcpu->vcpu_id;
u32 reg;