linux-kernel - Re: [PATCH 1/3] usbip: only dump valid port status

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Date:	Mon, 13 Jun 2011 23:47:39 +0200
From:	Németh Márton <nm127@...email.hu>
To:	Joe Perches <joe@...ches.com>
CC:	Greg Kroah-Hartman <gregkh@...e.de>,
	Matt Mooney <mfm@...eddisk.com>,
	Max Vozeler <max@...terhof.net>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	usbip-devel@...ts.sourceforge.net, devel@...verdev.osuosl.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] usbip: only dump valid port status

From: Márton Németh <nm127@...email.hu>

The wIndex parameter of vhci_hub_control() is always zero when the
request type is GetHubDescriptor, see drivers/usb/core/hub.c::get_hub_descriptor()
and Universal Serial Bus Specification revision 2.0 (April 27, 2000) Section
11.24.2.5 "Get Hub Descriptor". This means the variable rhport will not contain
any useful index. Only use valid rhport values.

Signed-off-by: Márton Németh <nm127@...email.hu>
---
 drivers/staging/usbip/vhci_hcd.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/usbip/vhci_hcd.c b/drivers/staging/usbip/vhci_hcd.c
index 359b464..512a97f 100644
--- a/drivers/staging/usbip/vhci_hcd.c
+++ b/drivers/staging/usbip/vhci_hcd.c
@@ -464,8 +464,11 @@ static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,

 	if (usbip_dbg_flag_vhci_rh) {
 		pr_debug("port %d\n", rhport);
-		dump_port_status(prev_port_status[rhport]);
-		dump_port_status(dum->port_status[rhport]);
+		/* Only dump valid port status */
+		if (rhport >= 0) {
+			dump_port_status(prev_port_status[rhport]);
+			dump_port_status(dum->port_status[rhport]);
+		}
 	}
 	usbip_dbg_vhci_rh(" bye\n");

--
1.7.2.5
--
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