From: Jiri Slaby <jslaby@xxxxxxx> [ Upstream commit cd3a4907ee334b40d7aa880c7ab310b154fd5cd4 ] When LSR is 0xff in ->activate() (rather unlike), we return an error. Provided ->shutdown() is not called when ->activate() fails, nothing actually frees the buffer in this case. Fix this by properly freeing the buffer in a designated label. We jump there also from the "!info->type" if now too. Fixes: 6769140d3047 ("tty: mxser: use the tty_port_open method") Signed-off-by: Jiri Slaby <jslaby@xxxxxxx> Link: https://lore.kernel.org/r/20220124071430.14907-6-jslaby@xxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/tty/mxser.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c index 7dd38047ba23..31d5a4d95c2d 100644 --- a/drivers/tty/mxser.c +++ b/drivers/tty/mxser.c @@ -866,6 +866,7 @@ static int mxser_activate(struct tty_port *port, struct tty_struct *tty) struct mxser_port *info = container_of(port, struct mxser_port, port); unsigned long page; unsigned long flags; + int ret; page = __get_free_page(GFP_KERNEL); if (!page) @@ -875,9 +876,9 @@ static int mxser_activate(struct tty_port *port, struct tty_struct *tty) if (!info->ioaddr || !info->type) { set_bit(TTY_IO_ERROR, &tty->flags); - free_page(page); spin_unlock_irqrestore(&info->slock, flags); - return 0; + ret = 0; + goto err_free_xmit; } info->port.xmit_buf = (unsigned char *) page; @@ -903,8 +904,10 @@ static int mxser_activate(struct tty_port *port, struct tty_struct *tty) if (capable(CAP_SYS_ADMIN)) { set_bit(TTY_IO_ERROR, &tty->flags); return 0; - } else - return -ENODEV; + } + + ret = -ENODEV; + goto err_free_xmit; } /* @@ -949,6 +952,10 @@ static int mxser_activate(struct tty_port *port, struct tty_struct *tty) spin_unlock_irqrestore(&info->slock, flags); return 0; +err_free_xmit: + free_page(page); + info->port.xmit_buf = NULL; + return ret; } /* -- 2.34.1