From: Christoffer Dall Date: Wed, 17 Aug 2016 08:46:10 +0000 (+0200) Subject: KVM: arm/arm64: Change misleading use of is_error_pfn X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9ac715954682b23d293d910ad2697554171035e7;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git KVM: arm/arm64: Change misleading use of is_error_pfn When converting a gfn to a pfn, we call gfn_to_pfn_prot, which returns various kinds of error values. It turns out that is_error_pfn() only returns true when the gfn was found in a memory slot and could somehow not be used, but it does not return true if the gfn does not belong to any memory slot. Change use to is_error_noslot_pfn() which covers both cases. Note: Since we already check for kvm_is_error_hva(hva) explicitly in the caller of this function while holding the kvm->srcu lock protecting the memory slots, this should never be a problem, but nevertheless this change is warranted as it shows the intention of the code. Reported-by: James Hogan Signed-off-by: Christoffer Dall --- diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c index bda27b6b1aa2..29d0b23af2a9 100644 --- a/arch/arm/kvm/mmu.c +++ b/arch/arm/kvm/mmu.c @@ -1309,7 +1309,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, smp_rmb(); pfn = gfn_to_pfn_prot(kvm, gfn, write_fault, &writable); - if (is_error_pfn(pfn)) + if (is_error_noslot_pfn(pfn)) return -EFAULT; if (kvm_is_device_pfn(pfn)) {