From mboxrd@z Thu Jan 1 00:00:00 1970 From: kernel test robot Subject: Re: [LKP] Re: [pipe] d60337eff1: BUG:kernel_NULL_pointer_dereference,address Date: Mon, 18 Nov 2019 15:53:22 +0800 Message-ID: <35daca93-ff2b-2c7d-b837-72396ca0677a@intel.com> References: <9279.1573824532@warthog.procyon.org.uk> <20191110031348.GE29418@shao2-debian> <6853.1573834946@warthog.procyon.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <6853.1573834946@warthog.procyon.org.uk> Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org To: David Howells , kernel test robot Cc: torvalds@linux-foundation.org, Rasmus Villemoes , Greg Kroah-Hartman , Peter Zijlstra , nicolas.dichtel@6wind.com, raven@themaw.net, Christian Brauner , keyrings@vger.kernel.org, linux-usb@vger.kernel.org, linux-block@vger.kernel.org, linux-security-module@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, lkp@lists.01.org List-Id: linux-api@vger.kernel.org Hi David, Yes, it can fix the problem. Best Regards, Rong Chen On 11/16/2019 12:22 AM, David Howells wrote: > Actually, no, this is the fix: > > diff --git a/lib/iov_iter.c b/lib/iov_iter.c > index 7006b5b2106d..be2fc5793ddd 100644 > --- a/lib/iov_iter.c > +++ b/lib/iov_iter.c > @@ -537,7 +537,7 @@ static size_t push_pipe(struct iov_iter *i, size_t size, > buf->ops = &default_pipe_buf_ops; > buf->page = page; > buf->offset = 0; > - buf->len = max_t(ssize_t, left, PAGE_SIZE); > + buf->len = min_t(ssize_t, left, PAGE_SIZE); > left -= buf->len; > iter_head++; > pipe->head = iter_head; > > David > _______________________________________________ > LKP mailing list -- lkp@lists.01.org > To unsubscribe send an email to lkp-leave@lists.01.org