linux-kernel - Re: [patch] w1: off by one in w1_f29_remove

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 for Android: free password hash cracker in your pocket

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

Message-ID: <4E33C3F5.9000602@bfs.de>
Date:	Sat, 30 Jul 2011 10:42:29 +0200
From:	walter harms <wharms@....de>
To:	Jean-François Dagenais <jeff.dagenais@...il.com>
CC:	Dan Carpenter <error27@...il.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	open list <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] w1: off by one in w1_f29_remove_slave()



Am 29.07.2011 22:28, schrieb Jean-François Dagenais:
> Yup, confirmed, weird that I did not notice a crash, probably lucky shot in the environment I was using it.
> 
> On 2011-07-27, at 05:55, Dan Carpenter wrote:
> 
>> This reads past the end of the w1_f29_sysfs_bin_files[] array.  I
>> don't have this hardware, but I assume it crashes every time the
>> function is called.
>>
>> Signed-off-by: Dan Carpenter <error27@...il.com>
> Acked-by: Jean-François Dagenais <dagenaisj@...atest.com>
>>
>> diff --git a/drivers/w1/slaves/w1_ds2408.c b/drivers/w1/slaves/w1_ds2408.c
>> index c377818..0da4e97 100644
>> --- a/drivers/w1/slaves/w1_ds2408.c
>> +++ b/drivers/w1/slaves/w1_ds2408.c
>> @@ -373,7 +373,7 @@ static int w1_f29_add_slave(struct w1_slave *sl)
>> static void w1_f29_remove_slave(struct w1_slave *sl)
>> {
>> 	int i;
>> -	for (i = NB_SYSFS_BIN_FILES; i <= 0; --i)
>> +	for (i = NB_SYSFS_BIN_FILES - 1; i <= 0; --i)
>> 		sysfs_remove_bin_file(&sl->dev.kobj,
>> 			&(w1_f29_sysfs_bin_files[i]));
>> }


Is there any reason to release the data "backwards" ?
The default way is to go upwards. that looks more readable.

for (i=0; i < NB_SYSFS_BIN_FILES ; i++)
  sysfs_remove_bin_file(&sl->dev.kobj, w1_f29_sysfs_bin_files+i);

re,
 wh
--
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/