diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2016-02-28 17:32:07 +0200 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-03-11 09:45:24 -0500 |
| commit | a0afb034eef8385fdfa882b103f5e3ec9f43b0ae (patch) | |
| tree | c6df9e6b42f39108593e592043fa9721fb16c594 /arch/arm | |
| parent | 6303c5122e28d378ccd755310307b938ad76e9ae (diff) | |
arm/arm64: KVM: Fix ioctl error handling
[ Upstream commit 4cad67fca3fc952d6f2ed9e799621f07666a560f ]
Calling return copy_to_user(...) in an ioctl will not
do the right thing if there's a pagefault:
copy_to_user returns the number of bytes not copied
in this case.
Fix up kvm to do
return copy_to_user(...)) ? -EFAULT : 0;
everywhere.
Cc: stable@vger.kernel.org
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/kvm/guest.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/kvm/guest.c b/arch/arm/kvm/guest.c index 8c97208b9b97..be68848071fd 100644 --- a/arch/arm/kvm/guest.c +++ b/arch/arm/kvm/guest.c @@ -173,7 +173,7 @@ static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) u64 val; val = kvm_arm_timer_get_reg(vcpu, reg->id); - return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)); + return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0; } static unsigned long num_core_regs(void) |