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Message-ID: <ZmAi3DoEBuv4txOL@gmail.com>
Date: Wed, 5 Jun 2024 01:33:32 -0700
From: Breno Leitao <leitao@...ian.org>
To: Keith Busch <kbusch@...nel.org>
Cc: Sathya Prakash <sathya.prakash@...adcom.com>,
Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>,
"James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>, leit@...a.com,
"open list:LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)" <MPT-FusionLinux.pdl@...adcom.com>,
"open list:LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)" <linux-scsi@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mpt3sas: Avoid test/set_bit() operating in non-allocated
memory
On Fri, May 31, 2024 at 03:10:45PM -0600, Keith Busch wrote:
> On Fri, May 31, 2024 at 11:00:54AM -0700, Breno Leitao wrote:
> > @@ -8529,6 +8535,12 @@ mpt3sas_base_attach(struct MPT3SAS_ADAPTER *ioc)
> > ioc->pend_os_device_add_sz = (ioc->facts.MaxDevHandle / 8);
> > if (ioc->facts.MaxDevHandle % 8)
> > ioc->pend_os_device_add_sz++;
> > +
> > + /* pend_os_device_add_sz should have, at least, the minimal room
> > + * for set_bit()/test_bit(), otherwise out-of-memory may occur
> > + */
> > + ioc->pend_os_device_add_sz = ALIGN(ioc->pend_os_device_add_sz,
> > + sizeof(unsigned long));
> > ioc->pend_os_device_add = kzalloc(ioc->pend_os_device_add_sz,
> > GFP_KERNEL);
> > if (!ioc->pend_os_device_add) {
> Do we need similiar ALIGN for _base_check_ioc_facts_changes() too?
Yes, that would help as well. Since it will protect
->device_remove_in_progress and others from the same problem.
Let me send a v2.
Thanks!
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