==================================================================
BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xb47/0xb50 fs/ext4/xattr.c:2917
Read of size 4 at addr ffff8881e9a03000 by task syz-executor/557

CPU: 0 PID: 557 Comm: syz-executor Not tainted 5.4.290-syzkaller-05054-g986c38813dff #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 __dump_stack+0x1e/0x20 lib/dump_stack.c:77
 dump_stack+0x15b/0x1b8 lib/dump_stack.c:118
 print_address_description+0x8d/0x4c0 mm/kasan/report.c:384
 __kasan_report+0xef/0x120 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131
 ext4_xattr_delete_inode+0xb47/0xb50 fs/ext4/xattr.c:2917
 ext4_evict_inode+0x11c0/0x1a30 fs/ext4/inode.c:318
 evict+0x465/0x880 fs/inode.c:610
 iput_final fs/inode.c:1652 [inline]
 iput+0x67d/0x810 fs/inode.c:1678
 d_delete_notify include/linux/fsnotify.h:230 [inline]
 vfs_rmdir+0x2b7/0x3e0 fs/namei.c:4040
 do_rmdir+0x23c/0x480 fs/namei.c:4088
 __do_sys_unlinkat fs/namei.c:4252 [inline]
 __se_sys_unlinkat fs/namei.c:4246 [inline]
 __x64_sys_unlinkat+0xb6/0xe0 fs/namei.c:4246
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7fea09ecd217
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:00007ffcd5b950a8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fea09ecd217
RDX: 0000000000000200 RSI: 00007ffcd5b96250 RDI: 00000000ffffff9c
RBP: 00007fea09f3b64a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffcd5b96250
R13: 00007fea09f3b64a R14: 000000000000f277 R15: 00007ffcd5b98430

Allocated by task 557:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x162/0x200 mm/kasan/common.c:529
 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:537
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2829 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0xe2/0x270 mm/slub.c:2842
 kmem_cache_alloc_node include/linux/slab.h:427 [inline]
 __alloc_skb+0x9e/0x500 net/core/skbuff.c:198
 alloc_skb include/linux/skbuff.h:1080 [inline]
 nlmsg_new include/net/netlink.h:888 [inline]
 inet6_rt_notify+0x287/0x470 net/ipv6/route.c:5988
 fib6_add_rt2node net/ipv6/ip6_fib.c:1187 [inline]
 fib6_add+0x21a3/0x3ad0 net/ipv6/ip6_fib.c:1416
 __ip6_ins_rt net/ipv6/route.c:1322 [inline]
 ip6_route_add+0x89/0x130 net/ipv6/route.c:3766
 addrconf_add_mroute net/ipv6/addrconf.c:2507 [inline]
 addrconf_add_dev+0x333/0x440 net/ipv6/addrconf.c:2525
 addrconf_dev_config+0x16c/0x330 net/ipv6/addrconf.c:3416
 addrconf_notify+0x9fe/0xeb0 net/ipv6/addrconf.c:3660
 notifier_call_chain kernel/notifier.c:98 [inline]
 __raw_notifier_call_chain kernel/notifier.c:399 [inline]
 raw_notifier_call_chain+0xa0/0x120 kernel/notifier.c:406
 call_netdevice_notifiers_info net/core/dev.c:1670 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:1682 [inline]
 call_netdevice_notifiers net/core/dev.c:1696 [inline]
 __dev_notify_flags+0x1e2/0x3d0 net/core/dev.c:-1
 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8034
 do_setlink+0xb98/0x39e0 net/core/rtnetlink.c:2542
 __rtnl_newlink net/core/rtnetlink.c:3188 [inline]
 rtnl_newlink+0x1136/0x15f0 net/core/rtnetlink.c:3314
 rtnetlink_rcv_msg+0xa23/0xbe0 net/core/rtnetlink.c:5290
 netlink_rcv_skb+0x1e6/0x430 net/netlink/af_netlink.c:2467
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5308
 netlink_unicast_kernel net/netlink/af_netlink.c:1306 [inline]
 netlink_unicast+0x88b/0xa40 net/netlink/af_netlink.c:1332
 netlink_sendmsg+0x88d/0xb30 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:638 [inline]
 __sock_sendmsg net/socket.c:650 [inline]
 __sys_sendto+0x414/0x570 net/socket.c:1961
 __do_sys_sendto net/socket.c:1973 [inline]
 __se_sys_sendto net/socket.c:1969 [inline]
 __x64_sys_sendto+0xe5/0x100 net/socket.c:1969
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Freed by task 557:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 kasan_set_free_info mm/kasan/common.c:345 [inline]
 __kasan_slab_free+0x1c3/0x280 mm/kasan/common.c:487
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:496
 slab_free_hook mm/slub.c:1455 [inline]
 slab_free_freelist_hook+0xb7/0x180 mm/slub.c:1494
 slab_free mm/slub.c:3080 [inline]
 kmem_cache_free+0x10c/0x2c0 mm/slub.c:3096
 kfree_skbmem+0x10c/0x180 net/core/skbuff.c:654
 __kfree_skb net/core/skbuff.c:690 [inline]
 consume_skb+0xb5/0x240 net/core/skbuff.c:849
 netlink_broadcast_filtered+0x1198/0x1290 net/netlink/af_netlink.c:1516
 netlink_broadcast net/netlink/af_netlink.c:1538 [inline]
 nlmsg_multicast include/net/netlink.h:968 [inline]
 nlmsg_notify+0xed/0x1b0 net/netlink/af_netlink.c:2510
 rtnl_notify+0x9a/0xc0 net/core/rtnetlink.c:737
 inet6_rt_notify+0x365/0x470 net/ipv6/route.c:6000
 fib6_add_rt2node net/ipv6/ip6_fib.c:1187 [inline]
 fib6_add+0x21a3/0x3ad0 net/ipv6/ip6_fib.c:1416
 __ip6_ins_rt net/ipv6/route.c:1322 [inline]
 ip6_route_add+0x89/0x130 net/ipv6/route.c:3766
 addrconf_add_mroute net/ipv6/addrconf.c:2507 [inline]
 addrconf_add_dev+0x333/0x440 net/ipv6/addrconf.c:2525
 addrconf_dev_config+0x16c/0x330 net/ipv6/addrconf.c:3416
 addrconf_notify+0x9fe/0xeb0 net/ipv6/addrconf.c:3660
 notifier_call_chain kernel/notifier.c:98 [inline]
 __raw_notifier_call_chain kernel/notifier.c:399 [inline]
 raw_notifier_call_chain+0xa0/0x120 kernel/notifier.c:406
 call_netdevice_notifiers_info net/core/dev.c:1670 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:1682 [inline]
 call_netdevice_notifiers net/core/dev.c:1696 [inline]
 __dev_notify_flags+0x1e2/0x3d0 net/core/dev.c:-1
 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8034
 do_setlink+0xb98/0x39e0 net/core/rtnetlink.c:2542
 __rtnl_newlink net/core/rtnetlink.c:3188 [inline]
 rtnl_newlink+0x1136/0x15f0 net/core/rtnetlink.c:3314
 rtnetlink_rcv_msg+0xa23/0xbe0 net/core/rtnetlink.c:5290
 netlink_rcv_skb+0x1e6/0x430 net/netlink/af_netlink.c:2467
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5308
 netlink_unicast_kernel net/netlink/af_netlink.c:1306 [inline]
 netlink_unicast+0x88b/0xa40 net/netlink/af_netlink.c:1332
 netlink_sendmsg+0x88d/0xb30 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:638 [inline]
 __sock_sendmsg net/socket.c:650 [inline]
 __sys_sendto+0x414/0x570 net/socket.c:1961
 __do_sys_sendto net/socket.c:1973 [inline]
 __se_sys_sendto net/socket.c:1969 [inline]
 __x64_sys_sendto+0xe5/0x100 net/socket.c:1969
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

The buggy address belongs to the object at ffff8881e9a03000
 which belongs to the cache skbuff_head_cache of size 240
The buggy address is located 0 bytes inside of
 240-byte region [ffff8881e9a03000, ffff8881e9a030f0)
The buggy address belongs to the page:
page:ffffea0007a680c0 refcount:1 mapcount:0 mapping:ffff8881f1ccc000 index:0x0
flags: 0x8000000000000200(slab)
raw: 8000000000000200 dead000000000100 dead000000000122 ffff8881f1ccc000
raw: 0000000000000000 00000000000c000c 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x35e/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x1296/0x1310 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x202/0x4b0 mm/page_alloc.c:4893
 alloc_slab_page+0x3c/0x3b0 mm/slub.c:343
 allocate_slab mm/slub.c:1683 [inline]
 new_slab+0x93/0x420 mm/slub.c:1749
 new_slab_objects mm/slub.c:2505 [inline]
 ___slab_alloc+0x29e/0x420 mm/slub.c:2667
 __slab_alloc+0x63/0xa0 mm/slub.c:2707
 slab_alloc_node mm/slub.c:2792 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0x12c/0x270 mm/slub.c:2842
 kmem_cache_alloc_node include/linux/slab.h:427 [inline]
 __alloc_skb+0x9e/0x500 net/core/skbuff.c:198
 alloc_skb include/linux/skbuff.h:1080 [inline]
 nlmsg_new include/net/netlink.h:888 [inline]
 rtmsg_ifinfo_build_skb+0x7c/0x180 net/core/rtnetlink.c:3528
 rtmsg_ifinfo_event net/core/rtnetlink.c:3564 [inline]
 rtmsg_ifinfo+0x7a/0x130 net/core/rtnetlink.c:3573
 __dev_notify_flags+0xdb/0x3d0 net/core/dev.c:7992
 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8034
 do_setlink+0xb98/0x39e0 net/core/rtnetlink.c:2542
 __rtnl_newlink net/core/rtnetlink.c:3188 [inline]
 rtnl_newlink+0x1136/0x15f0 net/core/rtnetlink.c:3314
 rtnetlink_rcv_msg+0xa23/0xbe0 net/core/rtnetlink.c:5290
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 free_pcp_prepare mm/page_alloc.c:1233 [inline]
 free_unref_page_prepare+0x2a9/0x3a0 mm/page_alloc.c:3085
 free_unref_page mm/page_alloc.c:3134 [inline]
 free_the_page mm/page_alloc.c:4953 [inline]
 __free_pages+0xaa/0x110 mm/page_alloc.c:4961
 __free_slab+0x218/0x2d0 mm/slub.c:1774
 rcu_free_slab+0x14/0x20 mm/slub.c:1781
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch+0x446/0x980 kernel/rcu/tree.c:2167
 rcu_core+0x4bd/0xbd0 kernel/rcu/tree.c:2387
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2396
 __do_softirq+0x236/0x660 kernel/softirq.c:292
 run_ksoftirqd+0x23/0x30 kernel/softirq.c:603
 smpboot_thread_fn+0x474/0x850 kernel/smpboot.c:165
 kthread+0x31e/0x3a0 kernel/kthread.c:288
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354

Memory state around the buggy address:
 ffff8881e9a02f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881e9a02f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881e9a03000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8881e9a03080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
 ffff8881e9a03100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
==================================================================
EXT4-fs error (device loop0): ext4_xattr_inode_iget:402: comm syz-executor: inode #1: comm syz-executor: iget: illegal inode #
EXT4-fs error (device loop0): ext4_xattr_inode_iget:407: comm syz-executor: error while reading EA inode 1 err=-117