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usb: gadget: u_serial: add missing port entry locking 

gserial_alloc_line() misses locking (for a release barrier) while
resetting port entry on TTY allocation failure. Fix this.

Cc: stable@vger.kernel.org
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Tested-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Michał Mirosław 2019-08-10 10:42:48 +02:00 committed by Felipe Balbi
parent 9ba3aca8fe
commit daf82bd24e
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/gadget/function/u_serial.c
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@ -1239,8 +1239,10 @@ int gserial_alloc_line(unsigned char *line_num)
__func__, port_num, PTR_ERR(tty_dev)); __func__, port_num, PTR_ERR(tty_dev));
ret = PTR_ERR(tty_dev); ret = PTR_ERR(tty_dev);
mutex_lock(&ports[port_num].lock);
port = ports[port_num].port; port = ports[port_num].port;
ports[port_num].port = NULL; ports[port_num].port = NULL;
mutex_unlock(&ports[port_num].lock);
gserial_free_port(port); gserial_free_port(port);
goto err; goto err;
} }