Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753338Ab3DVVWZ (ORCPT ); Mon, 22 Apr 2013 17:22:25 -0400 Received: from mail-ia0-f182.google.com ([209.85.210.182]:46250 "EHLO mail-ia0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751823Ab3DVVWX (ORCPT ); Mon, 22 Apr 2013 17:22:23 -0400 Date: Mon, 22 Apr 2013 14:22:18 -0700 From: Kent Overstreet To: Mike Snitzer Cc: linux-bcache@vger.kernel.org, linux-kernel@vger.kernel.org, dm-devel@redhat.com, axboe@kernel.dk Subject: Re: NULL pointer due to malformed bcache bio Message-ID: <20130422212218.GA4704@localhost> References: <20130410205439.GA18092@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130410205439.GA18092@redhat.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 710 Lines: 15 On Wed, Apr 10, 2013 at 04:54:40PM -0400, Mike Snitzer wrote: > Hey, > > So DM core clearly needs to be more defensive about the possibility for > a NULL return from bio_alloc_bioset() given I'm hitting a NULL pointer > in DM's alloc_tio() because nr_iovecs=512. bio_alloc_bioset()'s call to > bvec_alloc() only supports nr_iovecs up to BIO_MAX_PAGES (256). I have a fix for this queued up in my bcache-for-upstream, if you want to check and make sure it works. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/