linux-kernel - Re: [PATCH v3 3/3] x86/hyperv: Make encrypted/decrypted changes safe for load_unaligned

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Message-ID: <21f41af44fcc2ce52bdb40c7560fc7c9c0d56ec4.camel@intel.com>
Date: Fri, 12 Jan 2024 00:26:42 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	"ardb@...nel.org" <ardb@...nel.org>, "hch@...radead.org" <hch@...radead.org>,
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	<lstoakes@...il.com>, "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v3 3/3] x86/hyperv: Make encrypted/decrypted changes safe
 for load_unaligned_zeropad()

On Fri, 2024-01-05 at 10:30 -0800, mhkelley58@...il.com wrote:
>   * hv_vtom_set_host_visibility - Set specified memory visible to
> host.
>   *
> @@ -521,7 +547,7 @@ static bool hv_vtom_set_host_visibility(unsigned
> long kbuffer, int pagecount, bo
>  
>         pfn_array = kmalloc(HV_HYP_PAGE_SIZE, GFP_KERNEL);
>         if (!pfn_array)
> -               return false;
> +               goto err_set_memory_p;
>  

If kmalloc() fails here, and set_memory_p() succeeds below, then
hv_vtom_set_host_visibility() returns true, but skips all the
hv_mark_gpa_visibility() work. Shouldn't it return false?