linux-kernel - Re: [PATCH v2] virt: guest_memfd: fix reference leak on hwpoisoned page

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Date: Wed, 12 Jun 2024 16:36:32 -0700
From: Isaku Yamahata <isaku.yamahata@...el.com>
To: Paolo Bonzini <pbonzini@...hat.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	stable@...r.kernel.org, rick.p.edgecombe@...el.com
Subject: Re: [PATCH v2] virt: guest_memfd: fix reference leak on hwpoisoned
 page

On Tue, Jun 11, 2024 at 06:25:15AM -0400,
Paolo Bonzini <pbonzini@...hat.com> wrote:

> If __kvm_gmem_get_pfn() detects an hwpoisoned page, it returns -EHWPOISON
> but it does not put back the reference that kvm_gmem_get_folio() had
> grabbed.  Add the forgotten folio_put().
> 
> Fixes: a7800aa80ea4 ("KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory")
> Cc: stable@...r.kernel.org
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>

Reviewed-by: Isaku Yamahata <isaku.yamahata@...el.com>

-- 
Isaku Yamahata <isaku.yamahata@...el.com>