From: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Date: Tue, 22 Dec 2015 00:21:48 +0000 (+0100)
Subject: usb: dwc2: avoid out of bounds access
X-Git-Tag: v2016.01-rc4~10^2~2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5253aded464f99734698bffd33c662f1ac071fd0;p=platform%2Fkernel%2Fu-boot.git

usb: dwc2: avoid out of bounds access

flush_dcache_range may access data after priv->aligned_buffer end if
len > DWC2_DATA_BUF_SIZE.
memcpy may access data after buffer end if done > 0

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Acked-by: Marek Vasut <marex@denx.de>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
---

diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c
index 541c0f9..5ef6deb 100644
--- a/drivers/usb/host/dwc2.c
+++ b/drivers/usb/host/dwc2.c
@@ -823,12 +823,13 @@ int chunk_msg(struct dwc2_priv *priv, struct usb_device *dev,
 		       (*pid << DWC2_HCTSIZ_PID_OFFSET),
 		       &hc_regs->hctsiz);
 
-		if (!in) {
-			memcpy(priv->aligned_buffer, (char *)buffer + done, len);
+		if (!in && xfer_len) {
+			memcpy(priv->aligned_buffer, (char *)buffer + done,
+			       xfer_len);
 
 			flush_dcache_range((unsigned long)priv->aligned_buffer,
 				(unsigned long)((void *)priv->aligned_buffer +
-				roundup(len, ARCH_DMA_MINALIGN)));
+				roundup(xfer_len, ARCH_DMA_MINALIGN)));
 		}
 
 		writel(phys_to_bus((unsigned long)priv->aligned_buffer),