linux-kernel - Re: Oops when using growisofs

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, 23 Jun 2008 00:28:20 +0200
From:	Michael Buesch <mb@...sch.de>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: Oops when using growisofs

On Monday 23 June 2008 00:05:51 Michael Buesch wrote:
> > Note: r9 and r3 are both NULL pointers. r3 is the value returned from alloc_page_buffers.
> > R9 is a copy of that, which gets accessed.
> 
> Hm, yeah. I looked at that code already, but I can't see how it could return
> a NULL pointer.

Well, actually, it can return a NULL pointer.

 928         head = NULL;
 929         offset = PAGE_SIZE;
 930         while ((offset -= size) >= 0) {
...
 949         }
 950         return head;

So if size, which is a passed in as parameter, is > PAGE_SIZE it will return NULL.

The size parameter is calculated by doing
blocksize = 1 << inode->i_blkbits;
in an earlier function in the callchain.

So, well. I dunno what i_blkbits is. There's no docs in struct inode.

-- 
Greetings Michael.
--
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/