linux-kernel - Re: [PATCH][pci-next] PCI: endpoint: fix incorrect end of table check in while loop

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Date:   Tue, 29 Aug 2017 11:59:44 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Colin King <colin.king@...onical.com>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>, <linux-pci@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][pci-next] PCI: endpoint: fix incorrect end of table check
 in while loop



On Monday 28 August 2017 11:55 PM, Bjorn Helgaas wrote:
> On Wed, Aug 23, 2017 at 05:03:03PM +0100, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> Currently, the while loop will iterate until a matching name is found
>> or until the id pointer wraps around to NULL (the latter is incorrect).
>>
>> The end of a pci_epf_device_id table is terminated with zero'd entries
>> for name and driver_data, so can change the while loop to iterate while
>> the first character in the name is a non-zero character.
>>
>> Detected by CoverityScan, CID#1454557 ("Logically dead code")
>>
>> Fixes: 9e9d6eb48623 ("PCI: endpoint: Add an API to get matching "pci_epf_device_id")
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> 
> Kishon, do you want to ack this, please?

Acked-by: Kishon Vijay Abraham I <kishon@...com>
> 
>> ---
>>  drivers/pci/endpoint/pci-epf-core.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c
>> index ae6fac5995e3..70eccc04ee7f 100644
>> --- a/drivers/pci/endpoint/pci-epf-core.c
>> +++ b/drivers/pci/endpoint/pci-epf-core.c
>> @@ -273,7 +273,7 @@ pci_epf_match_device(const struct pci_epf_device_id *id, struct pci_epf *epf)
>>  	if (!id || !epf)
>>  		return NULL;
>>  
>> -	while (id) {
>> +	while (*id->name) {
>>  		if (strcmp(epf->name, id->name) == 0)
>>  			return id;
>>  		id++;
>> -- 
>> 2.14.1
>>