staging: comedi: vmk80xx: sanity check context used to get the boardinfo

As done in all the comedi drivers that auto attach, sanity check the
passed context that is used to get the boardinfo.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/vmk80xx.c b/drivers/staging/comedi/drivers/vmk80xx.c
index a87b1523165ee79158939ad0b99c3946d069e99f..3af075aa3946bb00a3558736c7381cff528ef636 100644 (file)
--- a/drivers/staging/comedi/drivers/vmk80xx.c
+++ b/drivers/staging/comedi/drivers/vmk80xx.c
@@ -795,7 +795,10 @@ static int vmk80xx_auto_attach(struct comedi_device *dev,
        struct vmk80xx_private *devpriv;
        int ret;
 
-       board = &vmk80xx_boardinfo[context];
+       if (context < ARRAY_SIZE(vmk80xx_boardinfo))
+               board = &vmk80xx_boardinfo[context];
+       if (!board)
+               return -ENODEV;
        dev->board_ptr = board;
        dev->board_name = board->name;