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

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: 33d3bc9556 ("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>
This commit is contained in:
Marc Zyngier 2017-11-16 17:58:17 +00:00 committed by Christoffer Dall
parent ddb4b0102c
commit 64afe6e9eb
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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@ -421,6 +421,7 @@ static int its_sync_lpi_pending_table(struct kvm_vcpu *vcpu)
u32 *intids;
int nr_irqs, i;
unsigned long flags;
u8 pendmask;
nr_irqs = vgic_copy_lpi_list(vcpu, &intids);
if (nr_irqs < 0)
@ -428,7 +429,6 @@ 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;