linux-kernel - Re: [PATCH] regmap: irq: Fix possible ZERO_SIZE

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]

Date:	Mon, 19 May 2014 17:15:48 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Xiubo Li <Li.Xiubo@...escale.com>
Cc:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regmap: irq: Fix possible ZERO_SIZE_PTR pointer
 dereferencing error.

On Mon, May 19, 2014 at 03:13:45PM +0800, Xiubo Li wrote:
> Since we cannot make sure the 'chip->num_regs' will always be none zero
> from the users, and then if 'chip->num_regs' equals to zero by mistake
> or other reasons, the kzalloc() will return ZERO_SIZE_PTR, which equals
> to ((void *)16).
> 
> So this patch fix this with just checking the 'chip->num_regs' before
> calling kzalloc().

Where is the actual dereference that's being protected against here?

> This also sorts the header files in alphabetical order at the same time.

No, don't do things like this.  It just makes things harder to review.

Download attachment "signature.asc" of type "application/pgp-signature" (837 bytes)