linux-kernel - Re: [PATCH] Revert "ACPICA: Interpreter: fix memory leak by using existing buffer"

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Date:   Sat, 6 Feb 2021 18:48:55 +0800
From:   Shawn Guo <shawn.guo@...aro.org>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, devel@...ica.org,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Len Brown <lenb@...nel.org>
Subject: Re: [PATCH] Revert "ACPICA: Interpreter: fix memory leak by using
 existing buffer"

On Sat, Feb 06, 2021 at 09:49:37AM +0100, Ard Biesheuvel wrote:
> This reverts commit 32cf1a12cad43358e47dac8014379c2f33dfbed4.
> 
> The 'exisitng buffer' in this case is the firmware provided table, and
> we should not modify that in place. This fixes a crash on arm64 with
> initrd table overrides, in which case the DSDT is not mapped with
> read/write permissions.
> 
> Cc: Robert Moore <robert.moore@...el.com>
> Cc: Erik Kaneda <erik.kaneda@...el.com>
> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
> Cc: Len Brown <lenb@...nel.org>
> Reported-by: Shawn Guo <shawn.guo@...aro.org>
> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>

Tested-by: Shawn Guo <shawn.guo@...aro.org>

Thanks for fixing the regression, Ard!

Shawn