USB: chaoskey read offset bug

Rng reads in chaoskey driver could return the same data under
the certain conditions.

Signed-off-by: Alexander Inyukhin <shurick@sectorb.msk.ru>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/usb/misc/chaoskey.c b/drivers/usb/misc/chaoskey.c
index 3ad5d19e4d04..23c794813e6a 100644
--- a/drivers/usb/misc/chaoskey.c
+++ b/drivers/usb/misc/chaoskey.c
@@ -472,7 +472,7 @@ static int chaoskey_rng_read(struct hwrng *rng, void *data,
         if (this_time > max)
                 this_time = max;
 
-        memcpy(data, dev->buf, this_time);
+        memcpy(data, dev->buf + dev->used, this_time);
 
         dev->used += this_time;