3.16.82-rc1 review patch. If anyone has any objections, please let me know.
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From: Michał Mirosław mirq-linux@rere.qmqm.pl
commit daf82bd24e308c5a83758047aff1bd81edda4f11 upstream.
gserial_alloc_line() misses locking (for a release barrier) while resetting port entry on TTY allocation failure. Fix this.
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 [bwh: Backported to 3.16: adjust filename] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/usb/gadget/u_serial.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/usb/gadget/u_serial.c +++ b/drivers/usb/gadget/u_serial.c @@ -1140,8 +1140,10 @@ int gserial_alloc_line(unsigned char *li __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; }