From: Alan Cox <alan@linux.intel.com>
Date: Wed, 19 Sep 2012 14:35:46 +0000 (+0100)
Subject: serial_core: Fix race in uart_handle_dcd_change
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~74^2~28
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=43eca0aef73cc6f0d37ad139f1cbb810e62e409d;p=pandora-kernel.git

serial_core: Fix race in uart_handle_dcd_change

If a serial driver is called post hangup with a second DCD event then we
will attempt to get the ldisc of NULL. Check we have a tty before trying to
do anything with it.

This is still only safe within the uart layer if the caller holds the
relevant uart locks. We could do with a version where the tty is passed for
more general use.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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