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KVM: arm64: Tolerate an empty target_table list

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Before emptying the target_table lists, and then removing their
infrastructure, add some tolerance to an empty list.

Instead of bugging-out on an empty list, pretend we already
reached the end in the two-list-walk.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200622113317.20477-3-james.morse@arm.com
This commit is contained in:
James Morse 2020-06-22 11:33:14 +00:00 committed by Marc Zyngier
parent 6b33e0d64f
commit 04343ae312
1 changed files with 4 additions and 1 deletions
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5
arch/arm64/kvm/sys_regs.c
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@ -2809,7 +2809,10 @@ static int walk_sys_regs(struct kvm_vcpu *vcpu, u64 __user *uind)
i2 = sys_reg_descs; i2 = sys_reg_descs;
end2 = sys_reg_descs + ARRAY_SIZE(sys_reg_descs); end2 = sys_reg_descs + ARRAY_SIZE(sys_reg_descs);
BUG_ON(i1 == end1 || i2 == end2); if (i1 == end1)
i1 = NULL;
BUG_ON(i2 == end2);
/* Walk carefully, as both tables may refer to the same register. */ /* Walk carefully, as both tables may refer to the same register. */
while (i1 || i2) { while (i1 || i2) {