[PATCH 4.8 17/37] KVM: PPC: BookE: Fix a sanity check

From: Greg Kroah-Hartman
Date: Fri Oct 14 2016 - 08:28:29 EST


4.8-stable review patch. If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

commit ac0e89bb4744d3882ccd275f2416d9ce22f4e1e7 upstream.

We use logical negate where bitwise negate was intended. It means that
we never return -EINVAL here.

Fixes: ce11e48b7fdd ('KVM: PPC: E500: Add userspace debug stub support')
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Reviewed-by: Alexander Graf <agraf@xxxxxxx>
Signed-off-by: Paul Mackerras <paulus@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
arch/powerpc/kvm/booke.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -2038,7 +2038,7 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(
if (type == KVMPPC_DEBUG_NONE)
continue;

- if (type & !(KVMPPC_DEBUG_WATCH_READ |
+ if (type & ~(KVMPPC_DEBUG_WATCH_READ |
KVMPPC_DEBUG_WATCH_WRITE |
KVMPPC_DEBUG_BREAKPOINT))
return -EINVAL;