CVE-2022-48919: In the Linux kernel, the following vulnerability has been resolved:  cifs: fix double free race when mount fails in cifs_get_root()  When cifs_get_root() fails during cifs_smb3_do_mount() we call deactivate_locked_super() which eventually will call delayed_free() which will free the context. In this situation we should not proceed to enter the out: section in cifs_smb3_do_mount() and free the same resources a second time.  [Thu Feb 10 12:59:06 2022] BUG: KASAN: use-after-free in rcu_cblist_dequeue+0x32/0x60 [Thu Feb 10 12:59:06 2022] Read of size 8 at addr ffff888364f4d110 by task swapper/1/0  [Thu Feb 10 12:59:06 2022] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G           OE     5.17.0-rc3+ #4 [Thu Feb 10 12:59:06 2022] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.0 12/17/2019 [Thu Feb 10 12:59:06 2022] Call Trace: [Thu Feb 10 12:59:06 2022]  <IRQ> [Thu Feb 10 12:59:06 2022]  dump_stack_lvl+0x5d/0x78 [Thu Feb 10 12:59:06 2022]  print_address_description.constprop.0+0x24/0x150 [Thu Feb 10 12:59:06 2022]  ? rcu_cblist_dequeue+0x32/0x60 [Thu Feb 10 12:59:06 2022]  kasan_report.cold+0x7d/0x117 [Thu Feb 10 12:59:06 2022]  ? rcu_cblist_dequeue+0x32/0x60 [Thu Feb 10 12:59:06 2022]  __asan_load8+0x86/0xa0 [Thu Feb 10 12:59:06 2022]  rcu_cblist_dequeue+0x32/0x60 [Thu Feb 10 12:59:06 2022]  rcu_core+0x547/0xca0 [Thu Feb 10 12:59:06 2022]  ? call_rcu+0x3c0/0x3c0 [Thu Feb 10 12:59:06 2022]  ? __this_cpu_preempt_check+0x13/0x20 [Thu Feb 10 12:59:06 2022]  ? lock_is_held_type+0xea/0x140 [Thu Feb 10 12:59:06 2022]  rcu_core_si+0xe/0x10 [Thu Feb 10 12:59:06 2022]  __do_softirq+0x1d4/0x67b [Thu Feb 10 12:59:06 2022]  __irq_exit_rcu+0x100/0x150 [Thu Feb 10 12:59:06 2022]  irq_exit_rcu+0xe/0x30 [Thu Feb 10 12:59:06 2022]  sysvec_hyperv_stimer0+0x9d/0xc0 ... [Thu Feb 10 12:59:07 2022] Freed by task 58179: [Thu Feb 10 12:59:07 2022]  kasan_save_stack+0x26/0x50 [Thu Feb 10 12:59:07 2022]  kasan_set_track+0x25/0x30 [Thu Feb 10 12:59:07 2022]  kasan_set_free_info+0x24/0x40 [Thu Feb 10 12:59:07 2022]  ____kasan_slab_free+0x137/0x170 [Thu Feb 10 12:59:07 2022]  __kasan_slab_free+0x12/0x20 [Thu Feb 10 12:59:07 2022]  slab_free_freelist_hook+0xb3/0x1d0 [Thu Feb 10 12:59:07 2022]  kfree+0xcd/0x520 [Thu Feb 10 12:59:07 2022]  cifs_smb3_do_mount+0x149/0xbe0 [cifs] [Thu Feb 10 12:59:07 2022]  smb3_get_tree+0x1a0/0x2e0 [cifs] [Thu Feb 10 12:59:07 2022]  vfs_get_tree+0x52/0x140 [Thu Feb 10 12:59:07 2022]  path_mount+0x635/0x10c0 [Thu Feb 10 12:59:07 2022]  __x64_sys_mount+0x1bf/0x210 [Thu Feb 10 12:59:07 2022]  do_syscall_64+0x5c/0xc0 [Thu Feb 10 12:59:07 2022]  entry_SYSCALL_64_after_hwframe+0x44/0xae  [Thu Feb 10 12:59:07 2022] Last potentially related work creation: [Thu Feb 10 12:59:07 2022]  kasan_save_stack+0x26/0x50 [Thu Feb 10 12:59:07 2022]  __kasan_record_aux_stack+0xb6/0xc0 [Thu Feb 10 12:59:07 2022]  kasan_record_aux_stack_noalloc+0xb/0x10 [Thu Feb 10 12:59:07 2022]  call_rcu+0x76/0x3c0 [Thu Feb 10 12:59:07 2022]  cifs_umount+0xce/0xe0 [cifs] [Thu Feb 10 12:59:07 2022]  cifs_kill_sb+0xc8/0xe0 [cifs] [Thu Feb 10 12:59:07 2022]  deactivate_locked_super+0x5d/0xd0 [Thu Feb 10 12:59:07 2022]  cifs_smb3_do_mount+0xab9/0xbe0 [cifs] [Thu Feb 10 12:59:07 2022]  smb3_get_tree+0x1a0/0x2e0 [cifs] [Thu Feb 10 12:59:07 2022]  vfs_get_tree+0x52/0x140 [Thu Feb 10 12:59:07 2022]  path_mount+0x635/0x10c0 [Thu Feb 10 12:59:07 2022]  __x64_sys_mount+0x1bf/0x210 [Thu Feb 10 12:59:07 2022]  do_syscall_64+0x5c/0xc0 [Thu Feb 10 12:59:07 2022]  entry_SYSCALL_64_after_hwframe+0x44/0xae