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usb: gadget: u_serial: add missing port entry locking
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>
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1 changed files with 2 additions and 0 deletions
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@ -1392,8 +1392,10 @@ int gserial_alloc_line(unsigned char *line_num)
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__func__, port_num, PTR_ERR(tty_dev));
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ret = PTR_ERR(tty_dev);
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mutex_lock(&ports[port_num].lock);
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port = ports[port_num].port;
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ports[port_num].port = NULL;
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mutex_unlock(&ports[port_num].lock);
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gserial_free_port(port);
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goto err;
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}
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