mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-26 02:39:48 +00:00
Code Issues Releases Wiki Activity

usb: gadget: u_serial: add missing port entry locking

Browse source 
commit daf82bd24e upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michał Mirosław 2019-08-10 10:42:48 +02:00 committed by Greg Kroah-Hartman
parent 4f3836c8ae
commit ec85bb89cc
1 changed files with 2 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/usb/gadget/function/u_serial.c
View file

@ -1392,8 +1392,10 @@ int gserial_alloc_line(unsigned char *line_num)
__func__, port_num, PTR_ERR(tty_dev));
ret = PTR_ERR(tty_dev);
mutex_lock(&ports[port_num].lock);
port = ports[port_num].port;
ports[port_num].port = NULL;
mutex_unlock(&ports[port_num].lock);
gserial_free_port(port);
goto err;
}