From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: Marek Vasut <marek.vasut@gmail.com>
Cc: linux-pci@vger.kernel.org,
Marek Vasut <marek.vasut+renesas@gmail.com>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Wolfram Sang <wsa@the-dreams.de>,
linux-renesas-soc@vger.kernel.org
Subject: Re: [PATCH V3 1/3] PCI: rcar: Move the inbound index check
Date: Fri, 16 Aug 2019 12:10:32 +0100 [thread overview]
Message-ID: <20190816111032.GC23677@e121166-lin.cambridge.arm.com> (raw)
In-Reply-To: <fcf457c1-7297-6a27-5bd7-4fdd05d72698@gmail.com>
On Fri, Aug 16, 2019 at 12:59:51PM +0200, Marek Vasut wrote:
> On 8/16/19 12:52 PM, Lorenzo Pieralisi wrote:
> > On Fri, Aug 09, 2019 at 07:57:39PM +0200, marek.vasut@gmail.com wrote:
> >> From: Marek Vasut <marek.vasut+renesas@gmail.com>
> >>
> >> Since the $idx variable value is stored across multiple calls to
> >> rcar_pcie_inbound_ranges() function, and the $idx value is used to
> >> index registers which are written, subsequent calls might cause
> >> the $idx value to be high enough to trigger writes into nonexistent
> >> registers.
> >
> > Can this really happen ? 'index' is initialized to 0 in
> > rcar_pci_parse_map_dma_ranges() and, through rcar_pcie_inbound_ranges()
> > return value, it bails out on idx overrun, we can argue this patch
> > improves robustness but I do not think it is fixing anything.
>
> We probably don't want to write into non-existent registers ?
I have not questioned that.
> I think it can happen when there are too many ranges in DT.
Yes that's true when idx == MAX_NR_INBOUND_MAPS, forgive me the
question.
Lorenzo
next prev parent reply other threads:[~2019-08-16 11:10 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-09 17:57 [PATCH V3 1/3] PCI: rcar: Move the inbound index check marek.vasut
2019-08-09 17:57 ` [PATCH V3 2/3] PCI: rcar: Do not abort on too many inbound dma-ranges marek.vasut
2019-08-16 13:23 ` Simon Horman
2019-08-16 13:28 ` Marek Vasut
2019-08-16 13:38 ` Simon Horman
2019-08-16 17:41 ` Marek Vasut
2019-10-21 10:18 ` Andrew Murray
2019-10-26 18:03 ` Marek Vasut
2019-10-26 20:36 ` Andrew Murray
2019-10-26 21:06 ` Andrew Murray
2019-11-06 23:37 ` Marek Vasut
2019-11-07 14:19 ` Andrew Murray
2019-11-16 15:48 ` Marek Vasut
2019-11-18 18:42 ` Robin Murphy
2019-12-22 7:46 ` Marek Vasut
2019-10-16 15:00 ` Lorenzo Pieralisi
2019-10-16 15:10 ` Marek Vasut
2019-10-16 15:26 ` Lorenzo Pieralisi
2019-10-16 15:29 ` Marek Vasut
2019-10-16 16:18 ` Lorenzo Pieralisi
2019-10-16 18:12 ` Rob Herring
2019-10-16 18:17 ` Marek Vasut
2019-10-16 20:25 ` Rob Herring
2019-10-16 21:15 ` Marek Vasut
2019-10-16 22:26 ` Rob Herring
2019-10-16 22:33 ` Marek Vasut
2019-10-17 7:06 ` Geert Uytterhoeven
2019-10-17 10:55 ` Marek Vasut
2019-10-17 13:06 ` Robin Murphy
2019-10-17 14:00 ` Marek Vasut
2019-10-17 14:36 ` Rob Herring
2019-10-17 15:01 ` Marek Vasut
2019-10-18 9:53 ` Lorenzo Pieralisi
2019-10-18 12:22 ` Marek Vasut
2019-10-18 12:53 ` Robin Murphy
2019-10-18 14:26 ` Marek Vasut
2019-10-18 15:44 ` Robin Murphy
2019-10-18 16:44 ` Marek Vasut
2019-10-18 17:35 ` Robin Murphy
2019-10-18 18:44 ` Marek Vasut
2019-10-21 8:32 ` Geert Uytterhoeven
2019-11-19 12:10 ` Robin Murphy
2019-10-18 10:06 ` Andrew Murray
2019-10-18 10:17 ` Geert Uytterhoeven
2019-10-18 11:40 ` Andrew Murray
2019-08-09 17:57 ` [PATCH V3 3/3] PCI: rcar: Recalculate inbound range alignment for each controller entry marek.vasut
2019-10-21 10:39 ` Andrew Murray
2019-08-16 10:52 ` [PATCH V3 1/3] PCI: rcar: Move the inbound index check Lorenzo Pieralisi
2019-08-16 10:59 ` Marek Vasut
2019-08-16 11:10 ` Lorenzo Pieralisi [this message]
2019-10-15 20:14 ` Marek Vasut
2019-10-21 10:11 ` Andrew Murray
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