From: Marc Zyngier marc.zyngier@arm.com

Commit 64afe6e9eb4841f35317da4393de21a047a883b3 upstream.

The current pending table parsing code assumes that we keep the previous read of the pending bits, but keep that variable in the current block, making sure it is discarded on each loop.

We end-up using whatever is on the stack. Who knows, it might just be the right thing...

Fixes: 33d3bc9556a7d ("KVM: arm64: vgic-its: Read initial LPI pending table") Cc: stable@vger.kernel.org # 4.8 Reported-by: AKASHI Takahiro takahiro.akashi@linaro.org Reviewed-by: Christoffer Dall christoffer.dall@linaro.org Signed-off-by: Marc Zyngier marc.zyngier@arm.com Signed-off-by: Christoffer Dall christoffer.dall@linaro.org --- virt/kvm/arm/vgic/vgic-its.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index 547f12dc4d54..d5a8bfe78bc4 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -393,6 +393,7 @@ static int its_sync_lpi_pending_table(struct kvm_vcpu *vcpu) int ret = 0; u32 *intids; int nr_irqs, i; + u8 pendmask;

nr_irqs = vgic_copy_lpi_list(vcpu, &intids); if (nr_irqs < 0) @@ -400,7 +401,6 @@ static int its_sync_lpi_pending_table(struct kvm_vcpu *vcpu)

for (i = 0; i < nr_irqs; i++) { int byte_offset, bit_nr; - u8 pendmask;

byte_offset = intids[i] / BITS_PER_BYTE; bit_nr = intids[i] % BITS_PER_BYTE;