================================================================== BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2904 Read of size 4 at addr ffff888114fff000 by task syz-executor/1152 CPU: 0 PID: 1152 Comm: syz-executor Tainted: G W 5.15.150-syzkaller-00330-g9044d25b8ff5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2904 ext4_evict_inode+0xea1/0x14e0 fs/ext4/inode.c:300 evict+0x2a3/0x630 fs/inode.c:587 iput_final fs/inode.c:1705 [inline] iput+0x63b/0x7e0 fs/inode.c:1731 d_delete_notify include/linux/fsnotify.h:270 [inline] vfs_rmdir+0x359/0x470 fs/namei.c:4162 do_rmdir+0x3ab/0x630 fs/namei.c:4210 __do_sys_unlinkat fs/namei.c:4390 [inline] __se_sys_unlinkat fs/namei.c:4384 [inline] __x64_sys_unlinkat+0xdf/0xf0 fs/namei.c:4384 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fcaf899d217 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffcb33e8f8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fcaf899d217 RDX: 0000000000000200 RSI: 00007fffcb33faa0 RDI: 00000000ffffff9c RBP: 00007fcaf8a0b515 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000207 R12: 00007fffcb33faa0 R13: 00007fcaf8a0b515 R14: 000000000001c203 R15: 0000000000000005 Allocated by task 418: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:512 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc+0x13a/0x270 mm/slub.c:4427 __kmalloc_node include/linux/slab.h:469 [inline] kmalloc_node include/linux/slab.h:626 [inline] kvmalloc_node+0x1f0/0x4d0 mm/util.c:628 kvmalloc include/linux/mm.h:851 [inline] simple_xattr_alloc+0x43/0xa0 fs/xattr.c:987 shmem_initxattrs+0x8d/0x200 mm/shmem.c:3187 security_inode_init_security+0x252/0x390 security/security.c:1115 shmem_mknod+0xb8/0x1c0 mm/shmem.c:2859 shmem_create+0x2c/0x40 mm/shmem.c:2917 lookup_open fs/namei.c:3462 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0x13a8/0x2f40 fs/namei.c:3739 do_filp_open+0x21c/0x460 fs/namei.c:3769 do_sys_openat2+0x13f/0x830 fs/open.c:1234 do_sys_open fs/open.c:1250 [inline] __do_sys_openat fs/open.c:1266 [inline] __se_sys_openat fs/open.c:1261 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1261 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3007 [inline] call_rcu+0x135/0x1310 kernel/rcu/tree.c:3125 collapse net/ipv4/fib_trie.c:702 [inline] resize+0x1b00/0x1d60 net/ipv4/fib_trie.c:905 trie_rebalance net/ipv4/fib_trie.c:1101 [inline] fib_remove_alias+0x4a5/0x6e0 net/ipv4/fib_trie.c:1664 fib_table_delete+0x1159/0x13f0 net/ipv4/fib_trie.c:1767 fib_magic net/ipv4/fib_frontend.c:1095 [inline] fib_del_ifaddr+0x1afb/0x2580 net/ipv4/fib_frontend.c:1306 fib_inetaddr_event+0xca/0x310 net/ipv4/fib_frontend.c:1437 notifier_call_chain kernel/notifier.c:83 [inline] blocking_notifier_call_chain+0xbb/0x140 kernel/notifier.c:318 __inet_del_ifa+0x7ff/0xdb0 net/ipv4/devinet.c:429 inet_del_ifa net/ipv4/devinet.c:466 [inline] inetdev_destroy net/ipv4/devinet.c:319 [inline] inetdev_event+0x654/0x10a0 net/ipv4/devinet.c:1599 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2025 [inline] call_netdevice_notifiers_extack net/core/dev.c:2037 [inline] call_netdevice_notifiers net/core/dev.c:2051 [inline] unregister_netdevice_many+0xe0a/0x17c0 net/core/dev.c:11105 default_device_exit_batch+0x38a/0x3f0 net/core/dev.c:11638 ops_exit_list net/core/net_namespace.c:174 [inline] cleanup_net+0x6ce/0xc00 net/core/net_namespace.c:596 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472 kthread+0x421/0x510 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff888114fff000 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff888114fff000, ffff888114fff040) The buggy address belongs to the page: page:ffffea000453ffc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888114fff000 pfn:0x114fff flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea00049b6c08 ffffea000441c348 ffff888100042780 raw: ffff888114fff000 0000000000200011 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 119, ts 4418342767, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2604 prep_new_page+0x1b/0x110 mm/page_alloc.c:2610 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4484 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5776 allocate_slab mm/slub.c:1932 [inline] new_slab+0x9a/0x4e0 mm/slub.c:1995 ___slab_alloc+0x39e/0x830 mm/slub.c:3028 __slab_alloc+0x4a/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3248 [inline] __kmalloc+0x16d/0x270 mm/slub.c:4423 __kmalloc_node include/linux/slab.h:469 [inline] kmalloc_node include/linux/slab.h:626 [inline] kvmalloc_node+0x1f0/0x4d0 mm/util.c:628 kvmalloc include/linux/mm.h:851 [inline] simple_xattr_alloc+0x43/0xa0 fs/xattr.c:987 shmem_initxattrs+0x8d/0x200 mm/shmem.c:3187 security_inode_init_security+0x252/0x390 security/security.c:1115 shmem_mknod+0xb8/0x1c0 mm/shmem.c:2859 shmem_mkdir+0x2c/0x60 mm/shmem.c:2907 vfs_mkdir+0x3f6/0x610 fs/namei.c:4065 do_mkdirat+0x1eb/0x450 fs/namei.c:4090 page_owner free stack trace missing Memory state around the buggy address: ffff888114ffef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888114ffef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888114fff000: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888114fff080: 00 00 00 00 00 00 00 02 fc fc fc fc fc fc fc fc ffff888114fff100: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================