From: Greg Kroah-Hartman gregkh@linuxfoundation.org
From: Ian Abbott abbotti@mev.co.uk
commit 1c0f20b78781b9ca50dc3ecfd396d0db5b141890 upstream.
The analog input subdevice supports Comedi asynchronous commands that use Comedi's 16-bit sample format. However, the call to `comedi_buf_write_samples()` is passing the address of a 32-bit integer variable. On bigendian machines, this will copy 2 bytes from the wrong end of the 32-bit value. Fix it by changing the type of the variable holding the sample value to `unsigned short`.
Fixes: d1d24cb65ee3 ("staging: comedi: das6402: read analog input samples in interrupt handler") Cc: stable@vger.kernel.org # 3.19+ Signed-off-by: Ian Abbott abbotti@mev.co.uk Link: https://lore.kernel.org/r/20210223143055.257402-5-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/staging/comedi/drivers/das6402.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/staging/comedi/drivers/das6402.c +++ b/drivers/staging/comedi/drivers/das6402.c @@ -193,7 +193,7 @@ static irqreturn_t das6402_interrupt(int if (status & DAS6402_STATUS_FFULL) { async->events |= COMEDI_CB_OVERFLOW; } else if (status & DAS6402_STATUS_FFNE) { - unsigned int val; + unsigned short val;
val = das6402_ai_read_sample(dev, s); comedi_buf_write_samples(s, &val, 1);