[PATCH 11/14] ubsan 1

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

[    1.893694] ================================================================================
[    1.893735] UBSAN: Undefined behaviour in drivers/acpi/sysfs.c:845:33
[    1.893762] shift exponent 64 is too large for 64-bit type 'long long unsigned int'
[    1.893794] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.14.0-rc5+ #532
[    1.893819] Hardware name: LENOVO 80MX/Lenovo E31-80, BIOS DCCN34WW(V2.03) 12/01/2015
[    1.893849] Call Trace:
[    1.893867]  dump_stack+0xab/0xfe
[    1.893885]  ? _atomic_dec_and_lock+0x112/0x112
[    1.893907]  ? get_unsigned_val+0x48/0x91
[    1.893935]  ubsan_epilogue+0x9/0x49
[    1.893953]  __ubsan_handle_shift_out_of_bounds+0x1ea/0x241
[    1.893978]  ? __ubsan_handle_load_invalid_value+0x136/0x136
[    1.894000]  ? do_raw_spin_unlock+0xf5/0x1d0
[    1.894000]  ? do_raw_spin_trylock+0x90/0x90
[    1.894000]  ? __lock_is_held+0x71/0x150
[    1.894000]  ? _raw_spin_unlock_irqrestore+0x32/0x50
[    1.894000]  ? trace_hardirqs_on_caller+0x184/0x360
[    1.894000]  ? acpi_gpe_apply_masked_gpes+0x95/0xfd
[    1.894000]  acpi_gpe_apply_masked_gpes+0x95/0xfd
[    1.894000]  ? acpi_gpe_set_masked_gpes+0xc1/0xc1
[    1.894000]  ? acpi_get_table+0xff/0x114
[    1.894000]  acpi_scan_init+0x1cf/0x3fe
[    1.894000]  ? acpi_match_madt+0xa7/0xa7
[    1.894000]  ? bus_register+0x386/0x450
[    1.894000]  ? subsys_register.part.1+0x140/0x140
[    1.894000]  acpi_init+0x41f/0x492
[    1.894000]  ? acpi_sleep_proc_init+0x30/0x30
[    1.894000]  ? console_unlock+0x524/0x7a0
[    1.894000]  ? trace_hardirqs_on_caller+0x184/0x360
[    1.894000]  ? scan_for_dmi_ipmi+0x22/0x202
[    1.894000]  ? fb_console_init+0x14f/0x1e6
[    1.894000]  ? acpi_sleep_proc_init+0x30/0x30
[    1.894000]  do_one_initcall+0xa3/0x256
[    1.894000]  ? parameq+0xe0/0xe0
[    1.894000]  ? initcall_blacklisted+0x160/0x160
[    1.894000]  ? down_write_nested+0x110/0x110
[    1.894000]  ? kasan_unpoison_shadow+0x30/0x40
[    1.894000]  kernel_init_freeable+0x3ee/0x47f
[    1.894000]  ? rest_init+0xf0/0xf0
[    1.894000]  kernel_init+0xf/0x140
[    1.894000]  ? rest_init+0xf0/0xf0
[    1.894000]  ret_from_fork+0x27/0x40
[    1.894000] ================================================================================

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/acpi/sysfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/sysfs.c b/drivers/acpi/sysfs.c
index 78a5a23010ab..8ae5cc7b31b2 100644
--- a/drivers/acpi/sysfs.c
+++ b/drivers/acpi/sysfs.c
@@ -817,7 +817,7 @@ static ssize_t counter_set(struct kobject *kobj,
  * Currently, the GPE flooding prevention only supports to mask the GPEs
  * numbered from 00 to 7f.
  */
-#define ACPI_MASKABLE_GPE_MAX	0x80
+#define ACPI_MASKABLE_GPE_MAX	63
 
 static u64 __initdata acpi_masked_gpes;
 
-- 
2.9.5