CVE-2024-50150: In the Linux kernel, the following vulnerability has been resolved:  usb: typec: altmode should keep reference to parent  The altmode device release refers to its parent device, but without keeping a reference to it.  When registering the altmode, get a reference to the parent and put it in the release function.  Before this fix, when using CONFIG_DEBUG_KOBJECT_RELEASE, we see issues like this:  [   43.572860] kobject: 'port0.0' (ffff8880057ba008): kobject_release, parent 0000000000000000 (delayed 3000) [   43.573532] kobject: 'port0.1' (ffff8880057bd008): kobject_release, parent 0000000000000000 (delayed 1000) [   43.574407] kobject: 'port0' (ffff8880057b9008): kobject_release, parent 0000000000000000 (delayed 3000) [   43.575059] kobject: 'port1.0' (ffff8880057ca008): kobject_release, parent 0000000000000000 (delayed 4000) [   43.575908] kobject: 'port1.1' (ffff8880057c9008): kobject_release, parent 0000000000000000 (delayed 4000) [   43.576908] kobject: 'typec' (ffff8880062dbc00): kobject_release, parent 0000000000000000 (delayed 4000) [   43.577769] kobject: 'port1' (ffff8880057bf008): kobject_release, parent 0000000000000000 (delayed 3000) [   46.612867] ================================================================== [   46.613402] BUG: KASAN: slab-use-after-free in typec_altmode_release+0x38/0x129 [   46.614003] Read of size 8 at addr ffff8880057b9118 by task kworker/2:1/48 [   46.614538] [   46.614668] CPU: 2 UID: 0 PID: 48 Comm: kworker/2:1 Not tainted 6.12.0-rc1-00138-gedbae730ad31 #535 [   46.615391] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 [   46.616042] Workqueue: events kobject_delayed_cleanup [   46.616446] Call Trace: [   46.616648]  <TASK> [   46.616820]  dump_stack_lvl+0x5b/0x7c [   46.617112]  ? typec_altmode_release+0x38/0x129 [   46.617470]  print_report+0x14c/0x49e [   46.617769]  ? rcu_read_unlock_sched+0x56/0x69 [   46.618117]  ? __virt_addr_valid+0x19a/0x1ab [   46.618456]  ? kmem_cache_debug_flags+0xc/0x1d [   46.618807]  ? typec_altmode_release+0x38/0x129 [   46.619161]  kasan_report+0x8d/0xb4 [   46.619447]  ? typec_altmode_release+0x38/0x129 [   46.619809]  ? process_scheduled_works+0x3cb/0x85f [   46.620185]  typec_altmode_release+0x38/0x129 [   46.620537]  ? process_scheduled_works+0x3cb/0x85f [   46.620907]  device_release+0xaf/0xf2 [   46.621206]  kobject_delayed_cleanup+0x13b/0x17a [   46.621584]  process_scheduled_works+0x4f6/0x85f [   46.621955]  ? __pfx_process_scheduled_works+0x10/0x10 [   46.622353]  ? hlock_class+0x31/0x9a [   46.622647]  ? lock_acquired+0x361/0x3c3 [   46.622956]  ? move_linked_works+0x46/0x7d [   46.623277]  worker_thread+0x1ce/0x291 [   46.623582]  ? __kthread_parkme+0xc8/0xdf [   46.623900]  ? __pfx_worker_thread+0x10/0x10 [   46.624236]  kthread+0x17e/0x190 [   46.624501]  ? kthread+0xfb/0x190 [   46.624756]  ? __pfx_kthread+0x10/0x10 [   46.625015]  ret_from_fork+0x20/0x40 [   46.625268]  ? __pfx_kthread+0x10/0x10 [   46.625532]  ret_from_fork_asm+0x1a/0x30 [   46.625805]  </TASK> [   46.625953] [   46.626056] Allocated by task 678: [   46.626287]  kasan_save_stack+0x24/0x44 [   46.626555]  kasan_save_track+0x14/0x2d [   46.626811]  __kasan_kmalloc+0x3f/0x4d [   46.627049]  __kmalloc_noprof+0x1bf/0x1f0 [   46.627362]  typec_register_port+0x23/0x491 [   46.627698]  cros_typec_probe+0x634/0xbb6 [   46.628026]  platform_probe+0x47/0x8c [   46.628311]  really_probe+0x20a/0x47d [   46.628605]  device_driver_attach+0x39/0x72 [   46.628940]  bind_store+0x87/0xd7 [   46.629213]  kernfs_fop_write_iter+0x1aa/0x218 [   46.629574]  vfs_write+0x1d6/0x29b [   46.629856]  ksys_write+0xcd/0x13b [   46.630128]  do_syscall_64+0xd4/0x139 [   46.630420]  entry_SYSCALL_64_after_hwframe+0x76/0x7e [   46.630820] [   46.630946] Freed by task 48: [   46.631182]  kasan_save_stack+0x24/0x44 [   46.631493]  kasan_save_track+0x14/0x2d [   46.631799]  kasan_save_free_info+0x3f/0x4d [   46.632144]  __kasan_slab_free+0x37/0x45 [   46.632474] ---truncated---