4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Thomas Gleixner <t...@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 <mar...@trippelsdorf.de>
Reported-by: Boris Ostrovsky <boris.ostrov...@oracle.com>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@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
@@ -682,6 +682,9 @@ static int threshold_create_bank(unsigne
const char *name = th_names[bank];
int err = 0;
+ if (!dev)
+ return -ENODEV;
+
if (is_shared_bank(bank)) {
nb = node_to_amd_nb(amd_get_nb_id(cpu));
