linux-kernel - Re: [PATCH 1/2] x86/PCI: Fix a sanity check in pirq_convert_irt

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Date:   Fri, 19 May 2023 12:21:50 +0100 (BST)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 1/2] x86/PCI: Fix a sanity check in
 pirq_convert_irt_table()

On Sat, 6 May 2023, Christophe JAILLET wrote:

> We compare the size in bytes of a struct (and its ending flexible array)
> with the number of elements in a flexible array.

 Incorrect, see the inline documentation for the struct.

> This is wrong and "ir->size < ir->used" is likely to be always false.

 Hopefully, but we've seen all kinds of rubbish in PC BIOS data, and this 
data structure seems available for OEMs to program with a tool called BCP.  
Better safe than sorry.  Therefore, NAK.

  Maciej