From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
From: Ian Abbott <abbotti@xxxxxxxxx>
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@xxxxxxxxxxxxxxx> # 3.19+
Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx>
Link: https://lore.kernel.org/r/20210223143055.257402-5-abbotti@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -186,7 +186,7 @@ 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);
