linux-kernel - [PATCH -next] KVM: x86/mmu: Fix return value check in kvm_mmu_init_tdp

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Date:   Fri, 1 Apr 2022 15:15:31 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>
CC:     <pbonzini@...hat.com>
Subject: [PATCH -next] KVM: x86/mmu: Fix return value check in kvm_mmu_init_tdp_mmu()

If alloc_workqueue() fails, it returns NULL pointer, replaces
IS_ERR() check with NULL pointer check.

Fixes: 1a3320dd2939 ("KVM: MMU: propagate alloc_workqueue failure")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 arch/x86/kvm/mmu/tdp_mmu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index a2f9a34a0168..7bddbb51033a 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -22,8 +22,8 @@ int kvm_mmu_init_tdp_mmu(struct kvm *kvm)
 		return 0;
 
 	wq = alloc_workqueue("kvm", WQ_UNBOUND|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 0);
-	if (IS_ERR(wq))
-		return PTR_ERR(wq);
+	if (!wq)
+		return -ENOMEM;
 
 	/* This should not be changed for the lifetime of the VM. */
 	kvm->arch.tdp_mmu_enabled = true;
-- 
2.25.1