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| author | Johan Hovold <johan@kernel.org> | 2017-01-12 14:56:16 +0100 |
|---|---|---|
| committer | Johan Hovold <johan@kernel.org> | 2017-01-16 16:38:56 +0100 |
| commit | 36356a669eddb32917fc4b5c2b9b8bf80ede69de (patch) | |
| tree | b22ebd4ccc8ff200b9fca70f9876f948d7bbee51 /drivers/usb/serial/mct_u232.c | |
| parent | 750acdd781cf7e97c8c60d2ff5053dd4b12bbc84 (diff) | |
| download | linux-stable-36356a669eddb32917fc4b5c2b9b8bf80ede69de.tar.gz linux-stable-36356a669eddb32917fc4b5c2b9b8bf80ede69de.tar.bz2 linux-stable-36356a669eddb32917fc4b5c2b9b8bf80ede69de.zip | |
USB: serial: mct_u232: fix modem-status error handling
Make sure to detect short control-message transfers so that errors are
logged when reading the modem status at open.
Note that while this also avoids initialising the modem status using
uninitialised heap data, these bits could not leak to user space as they
are currently not used.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/usb/serial/mct_u232.c')
| -rw-r--r-- | drivers/usb/serial/mct_u232.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c index 885655315de1..edbc81f205c2 100644 --- a/drivers/usb/serial/mct_u232.c +++ b/drivers/usb/serial/mct_u232.c @@ -322,8 +322,12 @@ static int mct_u232_get_modem_stat(struct usb_serial_port *port, MCT_U232_GET_REQUEST_TYPE, 0, 0, buf, MCT_U232_GET_MODEM_STAT_SIZE, WDR_TIMEOUT); - if (rc < 0) { + if (rc < MCT_U232_GET_MODEM_STAT_SIZE) { dev_err(&port->dev, "Get MODEM STATus failed (error = %d)\n", rc); + + if (rc >= 0) + rc = -EIO; + *msr = 0; } else { *msr = buf[0]; |