linux-kernel - [PATCH] KVM: s390: Move two error code assignments in kvm_vm_ioctl_get_dirty

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Date:   Sat, 21 Jan 2017 17:03:35 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        Christian Bornträger <borntraeger@...ibm.com>,
        Cornelia Huck <cornelia.huck@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] KVM: s390: Move two error code assignments in
 kvm_vm_ioctl_get_dirty_log()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sat, 21 Jan 2017 16:52:23 +0100

A local variable was set to an error code in two cases before a concrete
error situation was detected. Thus move the corresponding assignments into
if branches to indicate a software failure there.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 arch/s390/kvm/kvm-s390.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 4f74511015b8..bc875d08b838 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -443,16 +443,17 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 	int is_dirty = 0;
 
 	mutex_lock(&kvm->slots_lock);
-
-	r = -EINVAL;
-	if (log->slot >= KVM_USER_MEM_SLOTS)
+	if (log->slot >= KVM_USER_MEM_SLOTS) {
+		r = -EINVAL;
 		goto out;
+	}
 
 	slots = kvm_memslots(kvm);
 	memslot = id_to_memslot(slots, log->slot);
-	r = -ENOENT;
-	if (!memslot->dirty_bitmap)
+	if (!memslot->dirty_bitmap) {
+		r = -ENOENT;
 		goto out;
+	}
 
 	kvm_s390_sync_dirty_log(kvm, memslot);
 	r = kvm_get_dirty_log(kvm, log, &is_dirty);
-- 
2.11.0