CVE-2022-48954: In the Linux kernel, the following vulnerability has been resolved:  s390/qeth: fix use-after-free in hsci  KASAN found that addr was dereferenced after br2dev_event_work was freed.  ================================================================== BUG: KASAN: use-after-free in qeth_l2_br2dev_worker+0x5ba/0x6b0 Read of size 1 at addr 00000000fdcea440 by task kworker/u760:4/540 CPU: 17 PID: 540 Comm: kworker/u760:4 Tainted: G            E      6.1.0-20221128.rc7.git1.5aa3bed4ce83.300.fc36.s390x+kasan #1 Hardware name: IBM 8561 T01 703 (LPAR) Workqueue: 0.0.8000_event qeth_l2_br2dev_worker Call Trace:  [<000000016944d4ce>] dump_stack_lvl+0xc6/0xf8  [<000000016942cd9c>] print_address_description.constprop.0+0x34/0x2a0  [<000000016942d118>] print_report+0x110/0x1f8  [<0000000167a7bd04>] kasan_report+0xfc/0x128  [<000000016938d79a>] qeth_l2_br2dev_worker+0x5ba/0x6b0  [<00000001673edd1e>] process_one_work+0x76e/0x1128  [<00000001673ee85c>] worker_thread+0x184/0x1098  [<000000016740718a>] kthread+0x26a/0x310  [<00000001672c606a>] __ret_from_fork+0x8a/0xe8  [<00000001694711da>] ret_from_fork+0xa/0x40 Allocated by task 108338:  kasan_save_stack+0x40/0x68  kasan_set_track+0x36/0x48  __kasan_kmalloc+0xa0/0xc0  qeth_l2_switchdev_event+0x25a/0x738  atomic_notifier_call_chain+0x9c/0xf8  br_switchdev_fdb_notify+0xf4/0x110  fdb_notify+0x122/0x180  fdb_add_entry.constprop.0.isra.0+0x312/0x558  br_fdb_add+0x59e/0x858  rtnl_fdb_add+0x58a/0x928  rtnetlink_rcv_msg+0x5f8/0x8d8  netlink_rcv_skb+0x1f2/0x408  netlink_unicast+0x570/0x790  netlink_sendmsg+0x752/0xbe0  sock_sendmsg+0xca/0x110  ____sys_sendmsg+0x510/0x6a8  ___sys_sendmsg+0x12a/0x180  __sys_sendmsg+0xe6/0x168  __do_sys_socketcall+0x3c8/0x468  do_syscall+0x22c/0x328  __do_syscall+0x94/0xf0  system_call+0x82/0xb0 Freed by task 540:  kasan_save_stack+0x40/0x68  kasan_set_track+0x36/0x48  kasan_save_free_info+0x4c/0x68  ____kasan_slab_free+0x14e/0x1a8  __kasan_slab_free+0x24/0x30  __kmem_cache_free+0x168/0x338  qeth_l2_br2dev_worker+0x154/0x6b0  process_one_work+0x76e/0x1128  worker_thread+0x184/0x1098  kthread+0x26a/0x310  __ret_from_fork+0x8a/0xe8  ret_from_fork+0xa/0x40 Last potentially related work creation:  kasan_save_stack+0x40/0x68  __kasan_record_aux_stack+0xbe/0xd0  insert_work+0x56/0x2e8  __queue_work+0x4ce/0xd10  queue_work_on+0xf4/0x100  qeth_l2_switchdev_event+0x520/0x738  atomic_notifier_call_chain+0x9c/0xf8  br_switchdev_fdb_notify+0xf4/0x110  fdb_notify+0x122/0x180  fdb_add_entry.constprop.0.isra.0+0x312/0x558  br_fdb_add+0x59e/0x858  rtnl_fdb_add+0x58a/0x928  rtnetlink_rcv_msg+0x5f8/0x8d8  netlink_rcv_skb+0x1f2/0x408  netlink_unicast+0x570/0x790  netlink_sendmsg+0x752/0xbe0  sock_sendmsg+0xca/0x110  ____sys_sendmsg+0x510/0x6a8  ___sys_sendmsg+0x12a/0x180  __sys_sendmsg+0xe6/0x168  __do_sys_socketcall+0x3c8/0x468  do_syscall+0x22c/0x328  __do_syscall+0x94/0xf0  system_call+0x82/0xb0 Second to last potentially related work creation:  kasan_save_stack+0x40/0x68  __kasan_record_aux_stack+0xbe/0xd0  kvfree_call_rcu+0xb2/0x760  kernfs_unlink_open_file+0x348/0x430  kernfs_fop_release+0xc2/0x320  __fput+0x1ae/0x768  task_work_run+0x1bc/0x298  exit_to_user_mode_prepare+0x1a0/0x1a8  __do_syscall+0x94/0xf0  system_call+0x82/0xb0 The buggy address belongs to the object at 00000000fdcea400  which belongs to the cache kmalloc-96 of size 96 The buggy address is located 64 bytes inside of  96-byte region [00000000fdcea400, 00000000fdcea460) The buggy address belongs to the physical page: page:000000005a9c26e8 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xfdcea flags: 0x3ffff00000000200(slab|node=0|zone=1|lastcpupid=0x1ffff) raw: 3ffff00000000200 0000000000000000 0000000100000122 000000008008cc00 raw: 0000000000000000 0020004100000000 ffffffff00000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address:  00000000fdcea300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc  00000000fdcea380: fb fb fb fb fb fb f ---truncated---