From: Jan Kara Subject: Re: [PATCH v5 07/17] dax: remove the last BUG_ON() from fs/dax.c Date: Tue, 11 Oct 2016 08:50:01 +0200 Message-ID: <20161011065001.GB6952@quack2.suse.cz> References: <1475874544-24842-1-git-send-email-ross.zwisler@linux.intel.com> <1475874544-24842-8-git-send-email-ross.zwisler@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Theodore Ts'o , Matthew Wilcox , Dave Chinner , linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-xfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, Andreas Dilger , Alexander Viro , Jan Kara , linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Andrew Morton , linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Christoph Hellwig To: Ross Zwisler Return-path: Content-Disposition: inline In-Reply-To: <1475874544-24842-8-git-send-email-ross.zwisler-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-nvdimm-bounces-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org Sender: "Linux-nvdimm" List-Id: linux-ext4.vger.kernel.org On Fri 07-10-16 15:08:54, Ross Zwisler wrote: > Don't take down the kernel if we get an invalid 'from' and 'length' > argument pair. Just warn once and return an error. > > Signed-off-by: Ross Zwisler Looks good. You can add: Reviewed-by: Jan Kara Honza > --- > fs/dax.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/fs/dax.c b/fs/dax.c > index ac28cdf..98189ac 100644 > --- a/fs/dax.c > +++ b/fs/dax.c > @@ -1194,7 +1194,8 @@ int dax_zero_page_range(struct inode *inode, loff_t from, unsigned length, > /* Block boundary? Nothing to do */ > if (!length) > return 0; > - BUG_ON((offset + length) > PAGE_SIZE); > + if (WARN_ON_ONCE((offset + length) > PAGE_SIZE)) > + return -EINVAL; > > memset(&bh, 0, sizeof(bh)); > bh.b_bdev = inode->i_sb->s_bdev; > -- > 2.7.4 > > -- Jan Kara SUSE Labs, CR