From: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
To: linux-usb@vger.kernel.org
Cc: Felipe Balbi <balbi@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Ladislav Michl <ladis@linux-mips.org>
Subject: [PATCH v4 1/6] usb: gadget: u_serial: add missing port entry locking
Date: Mon, 22 Jul 2019 17:14:38 +0200 [thread overview]
Message-ID: <136348ea5b8eaee8d45fb4beb9b15c832243bd5b.1563808218.git.mirq-linux@rere.qmqm.pl> (raw)
In-Reply-To: <cover.1563808218.git.mirq-linux@rere.qmqm.pl>
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>
---
v4: no changes
v3: 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;
}
--
2.20.1
next prev parent reply other threads:[~2019-07-22 15:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-22 15:14 [PATCH v4 0/6] usb: gadget: u_serial: console improvements Michał Mirosław
2019-07-22 15:14 ` [PATCH v4 2/6] usb: gadget: u_serial: reimplement console support Michał Mirosław
2019-07-22 15:14 ` [PATCH v4 3/6] usb: gadget: u_serial: make OBEX port not a console Michał Mirosław
2019-07-22 15:14 ` Michał Mirosław [this message]
2019-07-22 15:14 ` [PATCH v4 5/6] usb: gadget: u_serial: diagnose missed console messages Michał Mirosław
2019-07-22 15:14 ` [PATCH v4 6/6] USB: gadget: legacy/serial: allow dynamic removal Michał Mirosław
2019-07-22 15:14 ` [PATCH v4 4/6] usb: gadget: u_serial: allow more console gadget ports Michał Mirosław
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