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Date: Fri, 12 Dec 2014 18:38:04 +0200 From: Imre Deak <imre.deak@...el.com> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jslaby@...e.cz> Cc: linux-kernel@...r.kernel.org Subject: [PATCH 2/3] vt: fix locking around vt_bind/vt_unbind Currently vt_bind and vt_unbind access at least the con_driver object and registered_con_driver array without holding the console lock. Fix this by locking around the whole function in each case. Signed-off-by: Imre Deak <imre.deak@...el.com> --- drivers/tty/vt/vt.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 1862e89..5dd1880 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -3312,11 +3312,8 @@ static int vt_bind(struct con_driver *con) if (first == 0 && last == MAX_NR_CONSOLES -1) deflt = 1; - if (first != -1) { - console_lock(); + if (first != -1) do_bind_con_driver(csw, first, last, deflt); - console_unlock(); - } first = -1; last = -1; @@ -3356,9 +3353,7 @@ static int vt_unbind(struct con_driver *con) deflt = 1; if (first != -1) { - console_lock(); ret = do_unbind_con_driver(csw, first, last, deflt); - console_unlock(); if (ret != 0) return ret; } @@ -3388,11 +3383,15 @@ static ssize_t store_bind(struct device *dev, struct device_attribute *attr, struct con_driver *con = dev_get_drvdata(dev); int bind = simple_strtoul(buf, NULL, 0); + console_lock(); + if (bind) vt_bind(con); else vt_unbind(con); + console_unlock(); + return count; } -- 1.8.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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