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Date: Wed, 9 Aug 2017 13:37:07 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Markus Trippelsdorf <markus@...ppelsdorf.de>, Boris Ostrovsky <boris.ostrovsky@...cle.com>, Thomas Gleixner <tglx@...utronix.de>, Linus Torvalds <torvalds@...ux-foundation.org>, Sasha Levin <alexander.levin@...izon.com> Subject: [PATCH 3.18 39/92] x86/mce/AMD: Make the init code more robust 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Thomas Gleixner <tglx@...utronix.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@...ppelsdorf.de> Reported-by: Boris Ostrovsky <boris.ostrovsky@...cle.com> Signed-off-by: Thomas Gleixner <tglx@...utronix.de> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> Signed-off-by: Sasha Levin <alexander.levin@...izon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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 @@ -573,6 +573,9 @@ 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));
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