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ttyprintk: Fix NULL pointer deref by setting tty_port ops after initializing port

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tty_port_init() zeroes out the tty port, which means that we have to set the
ops pointer /after/, not before this call.  Otherwise, tty_port_open will crash
when it tries to deref ops, which is now a NULL pointer.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Darrick J. Wong 2013-05-10 15:40:13 -07:00 committed by Greg Kroah-Hartman
parent 89fb9e7c34
commit b5325a02aa
1 changed files with 1 additions and 1 deletions
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2
drivers/char/ttyprintk.c
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@ -179,7 +179,6 @@ static int __init ttyprintk_init(void)
{
int ret = -ENOMEM;
tpk_port.port.ops = &null_ops;
mutex_init(&tpk_port.port_write_mutex);
ttyprintk_driver = tty_alloc_driver(1,
@ -190,6 +189,7 @@ static int __init ttyprintk_init(void)
return PTR_ERR(ttyprintk_driver);
tty_port_init(&tpk_port.port);
tpk_port.port.ops = &null_ops;
ttyprintk_driver->driver_name = "ttyprintk";
ttyprintk_driver->name = "ttyprintk";