[16859]:[BSP][Stability][KASAN] Fix proc_restart_level_all_write bug. BUG: KASAN: stack-out-of-bounds in _parse_integer+0x3c/0xd8 at addr ffffffc13dcd7bd1

Plan: BUG: KASAN: stack-out-of-bounds in _parse_integer+0x3c/0xd8 at addr ffffffc13dc
663602]@0 Read of size 1 by task init/1
page: ffffffbdc4f735c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000000()
663660]@0 page dumped because: kasan: bad access detected
CPU: 0 PID: 1 Comm: init Tainted: G        W       4.4.21-aging+ OnePlusOSS#7
@0 Hardware name: Qualcomm Technologies, Inc. MSM 8998 v2.1 MTP (DT)
@0 Call trace:
[<ffffff900808abc0>] dump_backtrace+0x0/0x2f4
[<ffffff900808aed8>] show_stack+0x24/0x30
[<ffffff900853d274>] dump_stack+0xbc/0xf8
[<ffffff90082733dc>] kasan_report+0x3a8/0x4f0
[<ffffff90082727b8>] __asan_load1+0x24/0x50
[<ffffff900855df0c>] _parse_integer+0x3c/0xd8
[<ffffff9008549fdc>] simple_strtoull+0x98/0xf0
[<ffffff900854aeb4>] simple_strtoll+0x4c/0x5c
[<ffffff900854b4c8>] vsscanf+0x604/0x87c
[<ffffff900854b7ec>] sscanf+0xac/0xd8
[<ffffff90087f17dc>] proc_restart_level_all_write+0xf4/0x318
[<ffffff9008307548>] proc_reg_write+0xc0/0xf0
[<ffffff90082844c0>] __vfs_write+0xe4/0x208
[<ffffff900828510c>] vfs_write+0xec/0x1c4
[<ffffff9008286088>] SyS_write+0xdc/0x158
[<ffffff9008085630>] el0_svc_naked+0x24/0x28
Type: BUG
Test: Do aging test
*

Change-Id: I9dcba507cce375342f7d3c3a8e56d04e1fe45847

Author: liwei

drivers/soc/qcom/subsystem_restart.c

@@ -697,7 +697,7 @@ static ssize_t proc_restart_level_all_read(struct file *p_file, char __user *pus
 static ssize_t proc_restart_level_all_write(struct file *p_file, const char __user *puser_buf,
 			   size_t count, loff_t *p_offset)
 {
-	char temp[1] = {0};
+	char temp[2] = {0};
 	struct subsys_device *subsys;
 
 	if (copy_from_user(temp, puser_buf, 1))