linux-ext4 - Re: [patch] ext4 crypto: testing the wrong variable

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20150411134811.GI6540@thunk.org>
Date:	Sat, 11 Apr 2015 09:48:11 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	walter harms <wharms@....de>, Julia Lawall <julia.lawall@...6.fr>,
	Michael Halcrow <mhalcrow@...gle.com>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-ext4@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] ext4 crypto: testing the wrong variable

On Wed, Apr 08, 2015 at 03:22:51PM +0300, Dan Carpenter wrote:
> > why test *buf == NULL ? xfree() can handle this.
> > 
> > the question is do programm depend on *buf=NULL.
> > In case of IS_ERR(*buf) *buf will be left unchanged
> > and later prgramms may things there is a buffer
> > available ?
> 
> Good point.  That IS_ERR() check is going to cause all kinds of future
> bugs.

Yes, it's not needed at all, so I'll just remove it.  I'm also going
to be fixing the whole fname_crypto_alloc_buffer() and
fname_crypto_free_buffer() so the calling convention isn't as
horrendous.  So basically, instead of

int ext4_fname_crypto_alloc_buffer(struct ext4_fname_crypto_ctx *ctx,
				   unsigned char **obuf, u32 *olen, u32 ilen);
void ext4_fname_crypto_free_buffer(void **buf);

it will be:

int ext4_fname_crypto_alloc_buffer(struct ext4_fname_crypto_ctx *ctx,
				   struct ext4_str *crypto_str, u32 ilen);
void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str);

(And BTW, this isn't appropriate for kernel-janitors since this code
isn't upstream yet)

							- Ted
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html