linux-kernel - [PATCH 3.16 252/370] powerpc: Add missing error check to prom_find_boot

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Message-ID: <lsq.1489146383.495676402@decadent.org.uk>
Date:   Fri, 10 Mar 2017 11:46:23 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Michael Ellerman" <mpe@...erman.id.au>,
        "Darren Stevens" <darren@...vens-zone.net>
Subject: [PATCH 3.16 252/370] powerpc: Add missing error check to
 prom_find_boot_cpu()

3.16.42-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Darren Stevens <darren@...vens-zone.net>

commit af2b7fa17eb92e52b65f96604448ff7a2a89ee99 upstream.

prom_init.c calls 'instance-to-package' twice, but the return
is not checked during prom_find_boot_cpu(). The result is then
passed to prom_getprop(), which could be PROM_ERROR. Add a return check
to prevent this.

This was found on a pasemi system, where CFE doesn't have a working
'instance-to package' prom call.

Before Commit 5c0484e25ec0 ('powerpc: Endian safe trampoline') the area
around addr 0 was mostly 0's and this doesn't cause a problem. Once the
macro 'FIXUP_ENDIAN' has been added to head_64.S, the low memory area
now has non-zero values, which cause the prom_getprop() call
to hang.

mpe: Also confirmed that under SLOF if 'instance-to-package' did fail
with PROM_ERROR we would crash in SLOF. So the bug is not specific to
CFE, it's just that other open firmwares don't trigger it because they
have a working 'instance-to-package'.

Fixes: 5c0484e25ec0 ("powerpc: Endian safe trampoline")
Signed-off-by: Darren Stevens <darren@...vens-zone.net>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/powerpc/kernel/prom_init.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -2635,6 +2635,9 @@ static void __init prom_find_boot_cpu(vo

 	cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);

+	if (!PHANDLE_VALID(cpu_pkg))
+		return;
+
 	prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
 	prom.cpu = be32_to_cpu(rval);