From: Alexander Inyukhin <shurick@sectorb.msk.ru>
Date: Sat, 26 Sep 2015 12:24:21 +0000 (+0300)
Subject: USB: chaoskey read offset bug
X-Git-Tag: v4.3-rc5~7^2~1
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1d5c47f555c5ae050fad22e4a99f88856cae5d05;p=karo-tx-linux.git

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>
---

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;