Patch "x86/mce/AMD: Make the init code more robust" has been added to the 4.9-stable tree

Patch "x86/mce/AMD: Make the init code more robust" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    x86/mce/AMD: Make the init code more robust

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     x86-mce-amd-make-the-init-code-more-robust.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Fri Aug  4 13:32:40 PDT 2017
From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 26 Dec 2016 22:58:20 +0100
Subject: x86/mce/AMD: Make the init code more robust

From: Thomas Gleixner <tglx@linutronix.de>


[ Upstream commit 0dad3a3014a0b9e72521ff44f17e0054f43dcdea ]

If mce_device_init() fails then the mce device pointer is NULL and the
AMD mce code happily dereferences it.

Add a sanity check.

Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Reported-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/x86/kernel/cpu/mcheck/mce_amd.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -955,6 +955,9 @@ static int threshold_create_bank(unsigne
 	const char *name = get_name(bank, NULL);
 	int err = 0;
 
+	if (!dev)
+		return -ENODEV;
+
 	if (is_shared_bank(bank)) {
 		nb = node_to_amd_nb(amd_get_nb_id(cpu));
 


Patches currently in stable-queue which might be from tglx@linutronix.de are

queue-4.9/smp-hotplug-move-unparking-of-percpu-threads-to-the-control-cpu.patch
queue-4.9/smp-hotplug-replace-bug_on-and-react-useful.patch
queue-4.9/sched-cgroup-move-sched_online_group-back-into-css_online-to-fix-crash.patch
queue-4.9/x86-mce-amd-make-the-init-code-more-robust.patch