[PATCH] usb: ehci: prevent bad PORTSC register access
Sascha Hauer
s.hauer at pengutronix.de
Wed Aug 26 05:23:13 PDT 2015
On Tue, Aug 25, 2015 at 06:45:21PM +0300, Antony Pavlov wrote:
> On Tue, 25 Aug 2015 15:59:58 +0300
> Peter Mamonov <pmamonov at gmail.com> wrote:
>
> > From: Kuo-Jung Su <dantesu at faraday-tech.com>
> >
> > 1. The 'index' of ehci_submit_root() is not always > 0.
> >
> > e.g.
> > While it gets invoked from usb_get_descriptor(),
> > the 'index' is always a '0'. (See ch.9 of USB2.0)
> >
> > 2. The PORTSC register is not always required, and thus it
> > should only report a port error when necessary.
> > It would cause a port scan failure if the ehci_submit_root()
> > always gets terminated by a port error.
> >
> > Signed-off-by: Kuo-Jung Su <dantesu at faraday-tech.com>
> > Signed-off-by: Peter Mamonov <pmamonov at gmail.com>
> > ---
> > drivers/usb/host/ehci-hcd.c | 38 ++++++++++++++++++++++++--------------
> > 1 file changed, 24 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
> > index 58c22db..1146b71 100644
> > --- a/drivers/usb/host/ehci-hcd.c
> > +++ b/drivers/usb/host/ehci-hcd.c
> > @@ -476,13 +476,8 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
> > int len, srclen;
> > uint32_t reg;
> > uint32_t *status_reg;
> > + int port = le16_to_cpu(req->index);
> >
> > - if (le16_to_cpu(req->index) >= CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS) {
> > - dev_err(ehci->dev, "The request port(%d) is not configured\n",
> > - le16_to_cpu(req->index) - 1);
> > - return -1;
> > - }
> > - status_reg = (uint32_t *)&ehci->hcor->or_portsc[le16_to_cpu(req->index) - 1];
> > srclen = 0;
> >
> > dev_dbg(ehci->dev, "req=%u (%#x), type=%u (%#x), value=%u, index=%u\n",
> > @@ -493,6 +488,21 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
> > typeReq = req->request | (req->requesttype << 8);
> >
> > switch (typeReq) {
> > + case USB_REQ_GET_STATUS | ((USB_RT_PORT | USB_DIR_IN) << 8):
> > + case USB_REQ_SET_FEATURE | ((USB_DIR_OUT | USB_RT_PORT) << 8):
> > + case USB_REQ_CLEAR_FEATURE | ((USB_DIR_OUT | USB_RT_PORT) << 8):
> > + if (!port || port > CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS) {
> > + printf("The request port(%d) is not configured\n", port - 1);
> > + return -1;
> > + }
> > + status_reg = (uint32_t *)&ehci->hcor->or_portsc[port - 1];
> > + break;
> > + default:
> > + status_reg = NULL;
> > + break;
> > + }
> > +
> > + switch (typeReq) {
> > case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
> > switch (le16_to_cpu(req->value) >> 8) {
> > case USB_DT_DEVICE:
> > @@ -571,7 +581,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
> > if (reg & EHCI_PS_OCA)
> > tmpbuf[0] |= USB_PORT_STAT_OVERCURRENT;
> > if (reg & EHCI_PS_PR &&
> > - (ehci->portreset & (1 << le16_to_cpu(req->index)))) {
> > + (ehci->portreset & (1 << port))) {
> > int ret;
> > /* force reset to complete */
> > reg = reg & ~(EHCI_PS_PR | EHCI_PS_CLEAR);
> > @@ -581,7 +591,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
> > tmpbuf[0] |= USB_PORT_STAT_RESET;
> > else
> > dev_err(ehci->dev, "port(%d) reset error\n",
> > - le16_to_cpu(req->index) - 1);
> > + port - 1);
> > }
> > if (reg & EHCI_PS_PP)
> > tmpbuf[1] |= USB_PORT_STAT_POWER >> 8;
> > @@ -608,7 +618,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
> > tmpbuf[2] |= USB_PORT_STAT_C_ENABLE;
> > if (reg & EHCI_PS_OCC)
> > tmpbuf[2] |= USB_PORT_STAT_C_OVERCURRENT;
> > - if (ehci->portreset & (1 << le16_to_cpu(req->index)))
> > + if (ehci->portreset & (1 << port))
> > tmpbuf[2] |= USB_PORT_STAT_C_RESET;
> >
> > srcptr = tmpbuf;
> > @@ -634,7 +644,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
> > EHCI_PS_IS_LOWSPEED(reg)) {
> > /* Low speed device, give up ownership. */
> > dev_dbg(ehci->dev, "port %d low speed --> companion\n",
> > - req->index - 1);
> > + port - 1);
> > reg |= EHCI_PS_PO;
> > ehci_writel(status_reg, reg);
> > break;
> > @@ -651,7 +661,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
> > */
> > ehci_powerup_fixup(ehci);
> > mdelay(50);
> > - ehci->portreset |= 1 << le16_to_cpu(req->index);
> > + ehci->portreset |= 1 << port;
> > /* terminate the reset */
> > ehci_writel(status_reg, reg & ~EHCI_PS_PR);
> > /*
> > @@ -663,10 +673,10 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
> > 2 * 1000);
> > if (!ret)
> > ehci->portreset |=
> > - 1 << le16_to_cpu(req->index);
> > + 1 << port;
> > else
> > dev_err(ehci->dev, "port(%d) reset error\n",
> > - le16_to_cpu(req->index) - 1);
> > + port - 1);
> >
> > }
> > break;
> > @@ -698,7 +708,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
> > reg |= EHCI_PS_OCC;
> > break;
> > case USB_PORT_FEAT_C_RESET:
> > - ehci->portreset &= ~(1 << le16_to_cpu(req->index));
> > + ehci->portreset &= ~(1 << port);
> > break;
> > default:
> > dev_dbg(ehci->dev, "unknown feature %x\n", le16_to_cpu(req->value));
> > --
> > 2.1.4
> >
>
>
> Actually this patch combines two U-boot patches:
>
> * usb: ehci: prevent bad PORTSC register access (http://lists.denx.de/pipermail/u-boot/2013-May/154319.html)
> * usb: Add new command to set USB 2.0 port test modes (http://lists.denx.de/pipermail/u-boot/2013-March/148104.html)
Not really. This patch contains only the parts of "usb: Add new command
to set USB 2.0 port test modes" which are necessary to make this one
apply. I splitted this up to two patches while applying with the patch
below.
Sascha
-----------------------------8<-----------------------
>From 484a1fb56890fee13a73070e0d868a3349a47c19 Mon Sep 17 00:00:00 2001
From: Kuo-Jung Su <dantesu at faraday-tech.com>
Date: Tue, 25 Aug 2015 15:59:58 +0300
Subject: [PATCH 2/3] usb: ehci: replace multiple use of
le16_to_cpu(req->index) with variable
This is part of U-Boot commit:
7d9aa8f usb: Add new command to set USB 2.0 port test modes
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
drivers/usb/host/ehci-hcd.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 0e7c595..8a6bbc9 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -475,10 +475,11 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
int len, srclen;
uint32_t reg;
uint32_t *status_reg;
+ int port = le16_to_cpu(req->index);
if (le16_to_cpu(req->index) >= CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS) {
dev_err(ehci->dev, "The request port(%d) is not configured\n",
- le16_to_cpu(req->index) - 1);
+ port - 1);
return -1;
}
status_reg = (uint32_t *)&ehci->hcor->or_portsc[le16_to_cpu(req->index) - 1];
@@ -570,7 +571,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
if (reg & EHCI_PS_OCA)
tmpbuf[0] |= USB_PORT_STAT_OVERCURRENT;
if (reg & EHCI_PS_PR &&
- (ehci->portreset & (1 << le16_to_cpu(req->index)))) {
+ (ehci->portreset & (1 << port))) {
int ret;
/* force reset to complete */
reg = reg & ~(EHCI_PS_PR | EHCI_PS_CLEAR);
@@ -580,7 +581,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
tmpbuf[0] |= USB_PORT_STAT_RESET;
else
dev_err(ehci->dev, "port(%d) reset error\n",
- le16_to_cpu(req->index) - 1);
+ port - 1);
}
if (reg & EHCI_PS_PP)
tmpbuf[1] |= USB_PORT_STAT_POWER >> 8;
@@ -607,7 +608,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
tmpbuf[2] |= USB_PORT_STAT_C_ENABLE;
if (reg & EHCI_PS_OCC)
tmpbuf[2] |= USB_PORT_STAT_C_OVERCURRENT;
- if (ehci->portreset & (1 << le16_to_cpu(req->index)))
+ if (ehci->portreset & (1 << port))
tmpbuf[2] |= USB_PORT_STAT_C_RESET;
srcptr = tmpbuf;
@@ -633,7 +634,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
EHCI_PS_IS_LOWSPEED(reg)) {
/* Low speed device, give up ownership. */
dev_dbg(ehci->dev, "port %d low speed --> companion\n",
- req->index - 1);
+ port - 1);
reg |= EHCI_PS_PO;
ehci_writel(status_reg, reg);
break;
@@ -650,7 +651,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
*/
ehci_powerup_fixup(ehci);
mdelay(50);
- ehci->portreset |= 1 << le16_to_cpu(req->index);
+ ehci->portreset |= 1 << port;
/* terminate the reset */
ehci_writel(status_reg, reg & ~EHCI_PS_PR);
/*
@@ -662,10 +663,10 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
2 * 1000);
if (!ret)
ehci->portreset |=
- 1 << le16_to_cpu(req->index);
+ 1 << port;
else
dev_err(ehci->dev, "port(%d) reset error\n",
- le16_to_cpu(req->index) - 1);
+ port - 1);
}
break;
@@ -697,7 +698,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
reg |= EHCI_PS_OCC;
break;
case USB_PORT_FEAT_C_RESET:
- ehci->portreset &= ~(1 << le16_to_cpu(req->index));
+ ehci->portreset &= ~(1 << port);
break;
default:
dev_dbg(ehci->dev, "unknown feature %x\n", le16_to_cpu(req->value));
--
2.5.0
--
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