linux-kernel - Re: linux-next: manual merge of the kvm tree with Linus' tree

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Date:   Fri, 2 Feb 2018 11:20:29 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Radim Krčmář <rkrcmar@...hat.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        KVM <kvm@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Eric Biggers <ebiggers@...gle.com>
Subject: Re: linux-next: manual merge of the kvm tree with Linus' tree

Hi Radim,

On Thu, 1 Feb 2018 16:22:44 +0100 Radim Krčmář <rkrcmar@...hat.com> wrote:
>
> I wasn't sure if the pti top branch is final, so I pulled hyper-v topic
> branch that also also contains v4.15.  This and the SEV feature
> conflicts should be gone now,

That merge would have been a good place to add the following merge
resolution fix patch I have been carrying:

From: Eric Biggers <ebiggers@...gle.com>
Subject: KVM: x86: don't forget vcpu_put() in kvm_arch_vcpu_ioctl_set_sregs()
Date: Thu, 21 Dec 2017 01:30:30 +0100

Due to a bad merge resolution between commit f29810335965 ("KVM/x86:
Check input paging mode when cs.l is set") and commit b4ef9d4e8cb8
("KVM: Move vcpu_load to arch-specific kvm_arch_vcpu_ioctl_set_sregs"),
there is a case in kvm_arch_vcpu_ioctl_set_sregs() where vcpu_put() is
not called after vcpu_get().  Fix it.

Reported-by: syzbot <syzkaller@...glegroups.com>
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 arch/x86/kvm/x86.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ea3a98196753..f4e8b5089b28 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7624,7 +7624,7 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 		goto out;
 
 	if (kvm_valid_sregs(vcpu, sregs))
-		return -EINVAL;
+		goto out;
 
 	apic_base_msr.data = sregs->apic_base;
 	apic_base_msr.host_initiated = true;

-- 
Cheers,
Stephen Rothwell