linux-kernel - Re: [PATCH] [REGRESSION] i2c-acpi: Fix NULL Pointer dereference

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Message-ID: <20140913063431.GJ10854@lahna.fi.intel.com>
Date:	Sat, 13 Sep 2014 09:34:31 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Peter Huewe <peterhuewe@....de>
Cc:	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [REGRESSION] i2c-acpi: Fix NULL Pointer dereference

On Fri, Sep 12, 2014 at 09:09:47PM +0200, Peter Huewe wrote:
> If adapter->dev.parent == NULL there is a NULL pointer dereference in
> acpi_i2c_install_space_handler and acpi_i2c_remove_space_handler.
> 
> This is present since introduction of this code:
> 366047515c6e "i2c: rework kernel config I2C_ACPI" or even
> da3c6647ee08 "I2C/ACPI: Clean up I2C ACPI code and Add CONFIG_I2C_ACPI"
> 
> The adapter->dev.parent == NULL case is valid for the i2c_stub,
> so loading i2c_stub with ACPI_I2C_OPREGION enabled results in an oops.
> This is also valid at least for i2c_tiny_usb and i2c_robotfuzz_osif.
> 
> Fix by checking whether it is null before calling ACPI_HANDLE.
> 
> Signed-off-by: Peter Huewe <peterhuewe@....de>

Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
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