linux-kernel - [PATCH 3.16 072/306] KVM: PPC: BookE: Fix a sanity check

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Message-ID: <lsq.1487198500.28121206@decadent.org.uk>
Date:   Wed, 15 Feb 2017 22:41:40 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Paul Mackerras" <paulus@...abs.org>,
        "Alexander Graf" <agraf@...e.de>,
        "Dan Carpenter" <dan.carpenter@...cle.com>
Subject: [PATCH 3.16 072/306] KVM: PPC: BookE: Fix a sanity check

3.16.40-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Dan Carpenter <dan.carpenter@...cle.com>

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@...cle.com>
Reviewed-by: Alexander Graf <agraf@...e.de>
Signed-off-by: Paul Mackerras <paulus@...abs.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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
@@ -1841,7 +1841,7 @@ 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;