| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 085/137] tty: serial: lpuart: avoid leaking struct tty_struct | Date | Tue, 2 Oct 2018 06:24:46 -0700 |
| |
4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Stefan Agner <stefan@agner.ch>
commit 3216c622a24b0ebb9c159a8d1daf7f17a106b3f5 upstream.
The function tty_port_tty_get() gets a reference to the tty. Since the code is not using tty_port_tty_set(), the reference is kept even after closing the tty.
Avoid using tty_port_tty_get() by directly access the tty instance. Since lpuart_start_rx_dma() is called from the .startup() and .set_termios() callback, it is safe to assume the tty instance is valid.
Cc: stable@vger.kernel.org # v4.9+ Fixes: 5887ad43ee02 ("tty: serial: fsl_lpuart: Use cyclic DMA for Rx") Signed-off-by: Stefan Agner <stefan@agner.ch> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/tty/serial/fsl_lpuart.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -983,7 +983,8 @@ static inline int lpuart_start_rx_dma(st struct circ_buf *ring = &sport->rx_ring; int ret, nent; int bits, baud; - struct tty_struct *tty = tty_port_tty_get(&sport->port.state->port); + struct tty_port *port = &sport->port.state->port; + struct tty_struct *tty = port->tty; struct ktermios *termios = &tty->termios; baud = tty_get_baud_rate(tty);
|