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tty: handle NULL parameters in free_tty_struct()
authorDan Carpenter <dan.carpenter@oracle.com>
Tue, 24 Jul 2012 11:52:04 +0000 (12:52 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 10 Aug 2012 19:54:27 +0000 (12:54 -0700)
We sometimes pass NULL pointers to free_tty_struct().  One example where
it can happen is in the error handling code in pty_common_install().

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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