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

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Message-ID: <4DF6E9B8.7060908@freemail.hu>
Date:	Tue, 14 Jun 2011 06:55:20 +0200
From:	Németh Márton <nm127@...email.hu>
To:	Joe Perches <joe@...ches.com>
CC:	devel@...verdev.osuosl.org, usbip-devel@...ts.sourceforge.net,
	Matt Mooney <mfm@...eddisk.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Subject: Re: [PATCH 1/3] usbip: only dump valid port status

Joe Perches wrote:
> On Mon, 2011-06-13 at 23:47 +0200, Németh Márton wrote:
>> 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]);
>> +		}
> 
> Umm, you mean to use "rhport > 0" yes?

No, it is really (rhport >= 0). The wIndex parameter is zero, the
rhport is wIndex - 1. So rhport zero is valid, rhport -1 is not valid.

Regards,

	Márton Németh
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