4.9-stable review patch. If anyone has any objections, please let me know.
------------------ From: Thomas Gleixner <[email protected]> [ 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 <[email protected]> Reported-by: Boris Ostrovsky <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Sasha Levin <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- 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));
