* [v3,1/5] usb: gadget: u_serial: add missing port entry locking
@ 2019-02-27 10:46 Michał Mirosław
0 siblings, 0 replies; 2+ messages in thread
From: Michał Mirosław @ 2019-02-27 10:46 UTC (permalink / raw)
To: linux-usb; +Cc: Felipe Balbi, Greg Kroah-Hartman
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>
---
v3: added cc-stable
v2: no changes
---
drivers/usb/gadget/function/u_serial.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/usb/gadget/function/u_serial.c b/drivers/usb/gadget/function/u_serial.c
index 65f634ec7fc2..bb1e2e1d0076 100644
--- a/drivers/usb/gadget/function/u_serial.c
+++ b/drivers/usb/gadget/function/u_serial.c
@@ -1239,8 +1239,10 @@ 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;
}
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [v3,1/5] usb: gadget: u_serial: add missing port entry locking
@ 2019-02-27 13:03 Greg Kroah-Hartman
0 siblings, 0 replies; 2+ messages in thread
From: Greg Kroah-Hartman @ 2019-02-27 13:03 UTC (permalink / raw)
To: Michał Mirosław; +Cc: linux-usb, Felipe Balbi
On Wed, Feb 27, 2019 at 11:46:57AM +0100, Michał Mirosław wrote:
> 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>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-02-27 10:46 [v3,1/5] usb: gadget: u_serial: add missing port entry locking Michał Mirosław
2019-02-27 13:03 Greg Kroah-Hartman
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