linux-kernel - Re: NULL ptr deref in acpi_idle

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Message-ID: <20251125075526.GBaSVg7nnKVcq9TiQl@fat_crate.local>
Date: Tue, 25 Nov 2025 08:55:26 +0100
From: Borislav Petkov <bp@...en8.de>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
	Huisong Li <lihuisong@...wei.com>
Cc: x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: NULL ptr deref in acpi_idle_enter+0x46/0x100

On Mon, Nov 24, 2025 at 09:00:19PM +0100, Borislav Petkov wrote:
> Hey,
> 
> I'm seeing this on one of my old test boxes here with -rc7 + the whole tip
> lineup.

Yap, you were right about 

  7a8c994cbb2d ("ACPI: processor: idle: Optimize ACPI idle driver registration")

having the potential of breaking something.

Reverting it fixes the issue on my machine.

Here's my revert log:

53f15ee83632 (HEAD -> refs/heads/rc7+) Revert "ACPI: processor: idle: Optimize ACPI idle driver registration"
8a2b68f3cfb5 Revert "ACPI: processor: idle: Add module import namespace"
8f6f9d389700 Revert "ACPI: processor: idle: Eliminate static variable flat_state_cnt"
09ccf5c5a51c Revert "ACPI: processor: idle: Redefine two functions as void"
509d71463c8c Revert "ACPI: processor: Do not expose global variable acpi_idle_driver"
fbd0b9c0ba44 mawk fix
03d9f45bc0fd Merge remote-tracking branch 'tip/objtool/core' into rc7+
785b41beb928 Merge remote-tracking branch 'tip/master' into rc7+
94d77cb7e8ec Merge remote-tracking branch 'ras/edac-for-next' into rc7+
...

Thx.

-- 
Regards/Gruss,
    Boris.

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