5.15-stable review patch. If anyone has any objections, please let me know.
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From: Florian Eckert fe@dev.tdt.de
commit 25054b232681c286fca9c678854f56494d1352cc upstream.
The ttyname buffer for the ledtrig_tty_data struct is allocated in the sysfs ttyname_store() function. This buffer must be released on trigger deactivation. This was missing and is thus a memory leak.
While we are at it, the TTY handler in the ledtrig_tty_data struct should also be returned in case of the trigger deactivation call.
Cc: stable@vger.kernel.org Fixes: fd4a641ac88f ("leds: trigger: implement a tty trigger") Signed-off-by: Florian Eckert fe@dev.tdt.de Reviewed-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Link: https://lore.kernel.org/r/20231127081621.774866-1-fe@dev.tdt.de Signed-off-by: Lee Jones lee@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/leds/trigger/ledtrig-tty.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/leds/trigger/ledtrig-tty.c +++ b/drivers/leds/trigger/ledtrig-tty.c @@ -168,6 +168,10 @@ static void ledtrig_tty_deactivate(struc
cancel_delayed_work_sync(&trigger_data->dwork);
+ kfree(trigger_data->ttyname); + tty_kref_put(trigger_data->tty); + trigger_data->tty = NULL; + kfree(trigger_data); }