CVE-2024-53177: In the Linux kernel, the following vulnerability has been resolved:  smb: prevent use-after-free due to open_cached_dir error paths  If open_cached_dir() encounters an error parsing the lease from the server, the error handling may race with receiving a lease break, resulting in open_cached_dir() freeing the cfid while the queued work is pending.  Update open_cached_dir() to drop refs rather than directly freeing the cfid.  Have cached_dir_lease_break(), cfids_laundromat_worker(), and invalidate_all_cached_dirs() clear has_lease immediately while still holding cfids->cfid_list_lock, and then use this to also simplify the reference counting in cfids_laundromat_worker() and invalidate_all_cached_dirs().  Fixes this KASAN splat (which manually injects an error and lease break in open_cached_dir()):  ================================================================== BUG: KASAN: slab-use-after-free in smb2_cached_lease_break+0x27/0xb0 Read of size 8 at addr ffff88811cc24c10 by task kworker/3:1/65  CPU: 3 UID: 0 PID: 65 Comm: kworker/3:1 Not tainted 6.12.0-rc6-g255cf264e6e5-dirty #87 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020 Workqueue: cifsiod smb2_cached_lease_break Call Trace:  <TASK>  dump_stack_lvl+0x77/0xb0  print_report+0xce/0x660  kasan_report+0xd3/0x110  smb2_cached_lease_break+0x27/0xb0  process_one_work+0x50a/0xc50  worker_thread+0x2ba/0x530  kthread+0x17c/0x1c0  ret_from_fork+0x34/0x60  ret_from_fork_asm+0x1a/0x30  </TASK>  Allocated by task 2464:  kasan_save_stack+0x33/0x60  kasan_save_track+0x14/0x30  __kasan_kmalloc+0xaa/0xb0  open_cached_dir+0xa7d/0x1fb0  smb2_query_path_info+0x43c/0x6e0  cifs_get_fattr+0x346/0xf10  cifs_get_inode_info+0x157/0x210  cifs_revalidate_dentry_attr+0x2d1/0x460  cifs_getattr+0x173/0x470  vfs_statx_path+0x10f/0x160  vfs_statx+0xe9/0x150  vfs_fstatat+0x5e/0xc0  __do_sys_newfstatat+0x91/0xf0  do_syscall_64+0x95/0x1a0  entry_SYSCALL_64_after_hwframe+0x76/0x7e  Freed by task 2464:  kasan_save_stack+0x33/0x60  kasan_save_track+0x14/0x30  kasan_save_free_info+0x3b/0x60  __kasan_slab_free+0x51/0x70  kfree+0x174/0x520  open_cached_dir+0x97f/0x1fb0  smb2_query_path_info+0x43c/0x6e0  cifs_get_fattr+0x346/0xf10  cifs_get_inode_info+0x157/0x210  cifs_revalidate_dentry_attr+0x2d1/0x460  cifs_getattr+0x173/0x470  vfs_statx_path+0x10f/0x160  vfs_statx+0xe9/0x150  vfs_fstatat+0x5e/0xc0  __do_sys_newfstatat+0x91/0xf0  do_syscall_64+0x95/0x1a0  entry_SYSCALL_64_after_hwframe+0x76/0x7e  Last potentially related work creation:  kasan_save_stack+0x33/0x60  __kasan_record_aux_stack+0xad/0xc0  insert_work+0x32/0x100  __queue_work+0x5c9/0x870  queue_work_on+0x82/0x90  open_cached_dir+0x1369/0x1fb0  smb2_query_path_info+0x43c/0x6e0  cifs_get_fattr+0x346/0xf10  cifs_get_inode_info+0x157/0x210  cifs_revalidate_dentry_attr+0x2d1/0x460  cifs_getattr+0x173/0x470  vfs_statx_path+0x10f/0x160  vfs_statx+0xe9/0x150  vfs_fstatat+0x5e/0xc0  __do_sys_newfstatat+0x91/0xf0  do_syscall_64+0x95/0x1a0  entry_SYSCALL_64_after_hwframe+0x76/0x7e  The buggy address belongs to the object at ffff88811cc24c00  which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 16 bytes inside of  freed 1024-byte region [ffff88811cc24c00, ffff88811cc25000)