linux-kernel - [v2]serial_core:recognize invalid pointer from userspace

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Date:	Thu, 10 Mar 2016 11:17:22 +0800
From:	Jiang Lu <lu.jiang@...driver.com>
To:	<gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>,
	<linux-serial@...r.kernel.org>
Subject: [v2]serial_core:recognize invalid pointer from userspace

Hi,
[v1 -> v2]

Fix a compile warning with data convert.

[v1 log]

When running setserial, application issue a TIOCGSERIAL iotcl to get serial setting, then update 
serial setting with TIOCSSERIAL ioctl. It always failed with TIOCSSERIAL ioctl, for application
pass 0xffffffff for iomem_base in serial_struct to kernel.

On 32bit rootfs & 64bit kernel, compat_ioctl use 0xffffffff as a magic number to mark invalid pointer
for iomem_base in serial_struct when truncating a 64bit pointer into 32bit.

Serial driver need recognize this invalid pointer when parsing serial_struct from userspace.

Thanks
Jiang Lu