linux-kernel - Re: drivers/of: crash on boot

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Date:	Wed, 18 May 2016 14:36:31 -0500
From:	Rob Herring <robh@...nel.org>
To:	Sasha Levin <sasha.levin@...cle.com>,
	Rhyland Klein <rklein@...dia.com>,
	Gavin Shan <gwshan@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: drivers/of: crash on boot

On Wed, May 18, 2016 at 10:34 AM, Sasha Levin <sasha.levin@...cle.com> wrote:
> Hi Rhyland,
>
> I'm seeing a crash on boot that seems to have been caused by
> "drivers/of: Fix depth when unflattening devicetree":
>
> [   61.145229] ==================================================================
>
> [   61.147588] BUG: KASAN: stack-out-of-bounds in unflatten_dt_nodes+0x11d2/0x1290 at addr ffff88005b30777c

The following appears to fix it for me. Rhyland, please confirm.

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 7f38241..888ec2a 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -409,7 +409,7 @@ static int unflatten_dt_nodes(const void *blob,
        fpsizes[depth] = dad ? strlen(of_node_full_name(dad)) : 0;
        nps[depth+1] = dad;
        for (offset = 0;
-            offset >= 0;
+            offset >= 0, depth >= 0;
             offset = fdt_next_node(blob, offset, &depth)) {
                if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH))
                        continue;