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

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[ Upstream commit 0dad3a3014 ]

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>
This commit is contained in:
Thomas Gleixner 2016-12-26 22:58:20 +01:00 committed by Greg Kroah-Hartman
parent f7e0f7f86c
commit 6b99f1a84d
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kernel/cpu/mcheck/mce_amd.c
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@ -682,6 +682,9 @@ static int threshold_create_bank(unsigned int cpu, unsigned int bank)
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));