linux-kernel - [PATCH 3.4 101/176] usb: dwc3: gadget: Stop TRB preparation after limit is reached

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1428569224-23820-101-git-send-email-lizf@kernel.org>
Date:	Thu,  9 Apr 2015 16:45:49 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Amit Virdi <amit.virdi@...com>,
	Felipe Balbi <balbi@...com>, Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 101/176] usb: dwc3: gadget: Stop TRB preparation after limit is reached

From: Amit Virdi <amit.virdi@...com>

3.4.107-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 39e60635a01520e8c8ed3946a28c2b98e6a46f79 upstream.

DWC3 gadget sets up a pool of 32 TRBs for each EP during initialization. This
means, the max TRBs that can be submitted for an EP is fixed to 32. Since the
request queue for an EP is a linked list, any number of requests can be queued
to it by the gadget layer.  However, the dwc3 driver must not submit TRBs more
than the pool it has created for. This limit wasn't respected when SG was used
resulting in submitting more than the max TRBs, eventually leading to
non-transfer of the TRBs submitted over the max limit.

Root cause:
When SG is used, there are two loops iterating to prepare TRBs:
 - Outer loop over the request_list
 - Inner loop over the SG list
The code was missing break to get out of the outer loop.

Fixes: eeb720fb21d6 (usb: dwc3: gadget: add support for SG lists)
Signed-off-by: Amit Virdi <amit.virdi@...com>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/usb/dwc3/gadget.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 1acb3a4..b7f8926 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -851,6 +851,9 @@ static void dwc3_prepare_trbs(struct dwc3_ep *dep, bool starting)
 				if (last_one)
 					break;
 			}
+
+			if (last_one)
+				break;
 		} else {
 			dma = req->request.dma;
 			length = req->request.length;
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/