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KVM: arm/arm64: vgic-its: Preserve the revious read from the pending table

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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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marc Zyngier 2017-11-16 17:58:17 +00:00 committed by Greg Kroah-Hartman
parent 80c0f4777f
commit 9414a6309c
1 changed files with 1 additions and 1 deletions
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2
virt/kvm/arm/vgic/vgic-its.c
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@ -322,6 +322,7 @@ 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->kvm, &intids);
if (nr_irqs < 0)
@ -329,7 +330,6 @@ 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;