CVE-2024-56587: In the Linux kernel, the following vulnerability has been resolved:  leds: class: Protect brightness_show() with led_cdev->led_access mutex  There is NULL pointer issue observed if from Process A where hid device being added which results in adding a led_cdev addition and later a another call to access of led_cdev attribute from Process B can result in NULL pointer issue.  Use mutex led_cdev->led_access to protect access to led->cdev and its attribute inside brightness_show() and max_brightness_show() and also update the comment for mutex that it should be used to protect the led class device fields.   Process A     Process B   kthread+0x114  worker_thread+0x244  process_scheduled_works+0x248  uhid_device_add_worker+0x24  hid_add_device+0x120  device_add+0x268  bus_probe_device+0x94  device_initial_probe+0x14  __device_attach+0xfc  bus_for_each_drv+0x10c  __device_attach_driver+0x14c  driver_probe_device+0x3c  __driver_probe_device+0xa0  really_probe+0x190  hid_device_probe+0x130  ps_probe+0x990  ps_led_register+0x94  devm_led_classdev_register_ext+0x58  led_classdev_register_ext+0x1f8  device_create_with_groups+0x48  device_create_groups_vargs+0xc8  device_add+0x244  kobject_uevent+0x14  kobject_uevent_env[jt]+0x224  mutex_unlock[jt]+0xc4  __mutex_unlock_slowpath+0xd4  wake_up_q+0x70  try_to_wake_up[jt]+0x48c  preempt_schedule_common+0x28  __schedule+0x628  __switch_to+0x174       el0t_64_sync+0x1a8/0x1ac       el0t_64_sync_handler+0x68/0xbc       el0_svc+0x38/0x68       do_el0_svc+0x1c/0x28       el0_svc_common+0x80/0xe0       invoke_syscall+0x58/0x114       __arm64_sys_read+0x1c/0x2c       ksys_read+0x78/0xe8       vfs_read+0x1e0/0x2c8       kernfs_fop_read_iter+0x68/0x1b4       seq_read_iter+0x158/0x4ec       kernfs_seq_show+0x44/0x54       sysfs_kf_seq_show+0xb4/0x130       dev_attr_show+0x38/0x74       brightness_show+0x20/0x4c       dualshock4_led_get_brightness+0xc/0x74  [ 3313.874295][ T4013] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000060 [ 3313.874301][ T4013] Mem abort info: [ 3313.874303][ T4013]   ESR = 0x0000000096000006 [ 3313.874305][ T4013]   EC = 0x25: DABT (current EL), IL = 32 bits [ 3313.874307][ T4013]   SET = 0, FnV = 0 [ 3313.874309][ T4013]   EA = 0, S1PTW = 0 [ 3313.874311][ T4013]   FSC = 0x06: level 2 translation fault [ 3313.874313][ T4013] Data abort info: [ 3313.874314][ T4013]   ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000 [ 3313.874316][ T4013]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 3313.874318][ T4013]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 3313.874320][ T4013] user pgtable: 4k pages, 39-bit VAs, pgdp=00000008f2b0a000 ..  [ 3313.874332][ T4013] Dumping ftrace buffer: [ 3313.874334][ T4013]    (ftrace buffer empty) .. .. [ dd3313.874639][ T4013] CPU: 6 PID: 4013 Comm: InputReader [ 3313.874648][ T4013] pc : dualshock4_led_get_brightness+0xc/0x74 [ 3313.874653][ T4013] lr : led_update_brightness+0x38/0x60 [ 3313.874656][ T4013] sp : ffffffc0b910bbd0 .. .. [ 3313.874685][ T4013] Call trace: [ 3313.874687][ T4013]  dualshock4_led_get_brightness+0xc/0x74 [ 3313.874690][ T4013]  brightness_show+0x20/0x4c [ 3313.874692][ T4013]  dev_attr_show+0x38/0x74 [ 3313.874696][ T4013]  sysfs_kf_seq_show+0xb4/0x130 [ 3313.874700][ T4013]  kernfs_seq_show+0x44/0x54 [ 3313.874703][ T4013]  seq_read_iter+0x158/0x4ec [ 3313.874705][ T4013]  kernfs_fop_read_iter+0x68/0x1b4 [ 3313.874708][ T4013]  vfs_read+0x1e0/0x2c8 [ 3313.874711][ T4013]  ksys_read+0x78/0xe8 [ 3313.874714][ T4013]  __arm64_sys_read+0x1c/0x2c [ 3313.874718][ T4013]  invoke_syscall+0x58/0x114 [ 3313.874721][ T4013]  el0_svc_common+0x80/0xe0 [ 3313.874724][ T4013]  do_el0_svc+0x1c/0x28 [ 3313.874727][ T4013]  el0_svc+0x38/0x68 [ 3313.874730][ T4013]  el0t_64_sync_handler+0x68/0xbc [ 3313.874732][ T4013]  el0t_64_sync+0x1a8/0x1ac