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leds: trigger: Fix error path to not unlock the unlocked mutex 

ttyname is allocated before the mutex is taken, so it must not be
unlocked in the error path.

Fixes: fd4a641ac8 ("leds: trigger: implement a tty trigger")
Reported-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20210219133307.4840-2-u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Uwe Kleine-König 2021-02-19 14:33:06 +01:00 committed by Greg Kroah-Hartman
parent a38fd87484
commit 1487e7bae8
1 changed files with 2 additions and 5 deletions
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7
drivers/leds/trigger/ledtrig-tty.c
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@ -51,10 +51,8 @@ static ssize_t ttyname_store(struct device *dev,
if (size) {
ttyname = kmemdup_nul(buf, size, GFP_KERNEL);
if (!ttyname) {
ret = -ENOMEM;
goto out_unlock;
}
if (!ttyname)
return -ENOMEM;
} else {
ttyname = NULL;
}
@ -69,7 +67,6 @@ static ssize_t ttyname_store(struct device *dev,
trigger_data->ttyname = ttyname;
out_unlock:
mutex_unlock(&trigger_data->mutex);
if (ttyname && !running)