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| author | Steven Price <steven.price@arm.com> | 2020-06-17 13:54:56 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-16 09:16:44 +0300 |
| commit | 79aaeec71271edbf5971894d7b31122dde588802 (patch) | |
| tree | 5c2a36d535f1dfba933b712b6d87750c8bd599e0 /arch | |
| parent | a494529add3f17ea983c5feb889b0281cea01f4b (diff) | |
| download | linux-79aaeec71271edbf5971894d7b31122dde588802.tar.xz | |
KVM: arm64: Fix kvm_reset_vcpu() return code being incorrect with SVE
If SVE is enabled then 'ret' can be assigned the return value of
kvm_vcpu_enable_sve() which may be 0 causing future "goto out" sites to
erroneously return 0 on failure rather than -EINVAL as expected.
Remove the initialisation of 'ret' and make setting the return value
explicit to avoid this situation in the future.
Fixes: 9a3cdf26e336 ("KVM: arm64/sve: Allow userspace to enable SVE for vcpus")
Cc: stable@vger.kernel.org
Reported-by: James Morse <james.morse@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200617105456.28245-1-steven.price@arm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kvm/reset.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index f4a8ae918827..784d485218ca 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -258,7 +258,7 @@ static int kvm_vcpu_enable_ptrauth(struct kvm_vcpu *vcpu) int kvm_reset_vcpu(struct kvm_vcpu *vcpu) { const struct kvm_regs *cpu_reset; - int ret = -EINVAL; + int ret; bool loaded; /* Reset PMU outside of the non-preemptible section */ @@ -281,15 +281,19 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu) if (test_bit(KVM_ARM_VCPU_PTRAUTH_ADDRESS, vcpu->arch.features) || test_bit(KVM_ARM_VCPU_PTRAUTH_GENERIC, vcpu->arch.features)) { - if (kvm_vcpu_enable_ptrauth(vcpu)) + if (kvm_vcpu_enable_ptrauth(vcpu)) { + ret = -EINVAL; goto out; + } } switch (vcpu->arch.target) { default: if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) { - if (!cpu_has_32bit_el1()) + if (!cpu_has_32bit_el1()) { + ret = -EINVAL; goto out; + } cpu_reset = &default_regs_reset32; } else { cpu_reset = &default_regs_reset; |