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BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xc1f/0xc30 fs/ext4/xattr.c:2917
Read of size 4 at addr ffff8881eba89000 by task syz-executor/535

CPU: 0 PID: 535 Comm: syz-executor Not tainted 5.4.283-syzkaller-04981-g1cca65ac6abc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x241 lib/dump_stack.c:118
 print_address_description+0x8c/0x600 mm/kasan/report.c:384
 __kasan_report+0xf3/0x120 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 ext4_xattr_delete_inode+0xc1f/0xc30 fs/ext4/xattr.c:2917
 ext4_evict_inode+0x1378/0x1ac0 fs/ext4/inode.c:318
 evict+0x4ea/0x960 fs/inode.c:610
 d_delete_notify include/linux/fsnotify.h:230 [inline]
 vfs_rmdir+0x24b/0x3c0 fs/namei.c:4040
 do_rmdir+0x2c1/0x580 fs/namei.c:4088
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f1b00233597
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:00007ffcaa87fb78 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f1b00233597
RDX: 0000000000000200 RSI: 00007ffcaa880d20 RDI: 00000000ffffff9c
RBP: 00007f1b002a165d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffcaa880d20
R13: 00007f1b002a165d R14: 000000000000c39b R15: 0000000000000005

Allocated by task 455:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
 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+0xd9/0x250 mm/slub.c:2842
 skb_clone+0x1c0/0x360 net/core/skbuff.c:1467
 dev_queue_xmit_nit+0x258/0xa10 net/core/dev.c:1966
 xmit_one net/core/dev.c:3217 [inline]
 dev_hard_start_xmit+0x12b/0x6b0 net/core/dev.c:3237
 sch_direct_xmit+0x28f/0xa10 net/sched/sch_generic.c:336
 qdisc_restart net/sched/sch_generic.c:401 [inline]
 __qdisc_run+0xa14/0x1e80 net/sched/sch_generic.c:409
 qdisc_run+0xf8/0x300 include/net/pkt_sched.h:122
 __dev_xmit_skb net/core/dev.c:3413 [inline]
 __dev_queue_xmit+0xb43/0x27e0 net/core/dev.c:3768
 neigh_hh_output include/net/neighbour.h:502 [inline]
 neigh_output include/net/neighbour.h:516 [inline]
 ip_finish_output2+0xb4f/0xfc0 net/ipv4/ip_output.c:236
 NF_HOOK_COND include/linux/netfilter.h:292 [inline]
 ip_output+0x19b/0x3a0 net/ipv4/ip_output.c:440
 dst_output include/net/dst.h:438 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0xfaa/0x1850 net/ipv4/ip_output.c:541
 __tcp_transmit_skb+0x1dfa/0x33a0 net/ipv4/tcp_output.c:1179
 tcp_transmit_skb net/ipv4/tcp_output.c:1195 [inline]
 tcp_write_xmit+0x17b0/0x5cd0 net/ipv4/tcp_output.c:2478
 __tcp_push_pending_frames+0x91/0x2e0 net/ipv4/tcp_output.c:2660
 tcp_sendmsg_locked+0x2fff/0x3810 net/ipv4/tcp.c:1420
 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1450
 sock_sendmsg_nosec net/socket.c:638 [inline]
 __sock_sendmsg net/socket.c:650 [inline]
 sock_write_iter+0x344/0x470 net/socket.c:1009
 call_write_iter include/linux/fs.h:1989 [inline]
 new_sync_write fs/read_write.c:483 [inline]
 __vfs_write+0x5d3/0x750 fs/read_write.c:496
 vfs_write+0x206/0x4e0 fs/read_write.c:558
 ksys_write+0x199/0x2c0 fs/read_write.c:611
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Freed by task 455:
 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+0x1b5/0x270 mm/kasan/common.c:487
 slab_free_hook mm/slub.c:1455 [inline]
 slab_free_freelist_hook mm/slub.c:1494 [inline]
 slab_free mm/slub.c:3080 [inline]
 kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096
 packet_rcv+0x13b/0x1160 net/packet/af_packet.c:2232
 dev_queue_xmit_nit+0x976/0xa10 net/core/dev.c:1998
 xmit_one net/core/dev.c:3217 [inline]
 dev_hard_start_xmit+0x12b/0x6b0 net/core/dev.c:3237
 sch_direct_xmit+0x28f/0xa10 net/sched/sch_generic.c:336
 qdisc_restart net/sched/sch_generic.c:401 [inline]
 __qdisc_run+0xa14/0x1e80 net/sched/sch_generic.c:409
 qdisc_run+0xf8/0x300 include/net/pkt_sched.h:122
 __dev_xmit_skb net/core/dev.c:3413 [inline]
 __dev_queue_xmit+0xb43/0x27e0 net/core/dev.c:3768
 neigh_hh_output include/net/neighbour.h:502 [inline]
 neigh_output include/net/neighbour.h:516 [inline]
 ip_finish_output2+0xb4f/0xfc0 net/ipv4/ip_output.c:236
 NF_HOOK_COND include/linux/netfilter.h:292 [inline]
 ip_output+0x19b/0x3a0 net/ipv4/ip_output.c:440
 dst_output include/net/dst.h:438 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0xfaa/0x1850 net/ipv4/ip_output.c:541
 __tcp_transmit_skb+0x1dfa/0x33a0 net/ipv4/tcp_output.c:1179
 tcp_transmit_skb net/ipv4/tcp_output.c:1195 [inline]
 tcp_write_xmit+0x17b0/0x5cd0 net/ipv4/tcp_output.c:2478
 __tcp_push_pending_frames+0x91/0x2e0 net/ipv4/tcp_output.c:2660
 tcp_sendmsg_locked+0x2fff/0x3810 net/ipv4/tcp.c:1420
 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1450
 sock_sendmsg_nosec net/socket.c:638 [inline]
 __sock_sendmsg net/socket.c:650 [inline]
 sock_write_iter+0x344/0x470 net/socket.c:1009
 call_write_iter include/linux/fs.h:1989 [inline]
 new_sync_write fs/read_write.c:483 [inline]
 __vfs_write+0x5d3/0x750 fs/read_write.c:496
 vfs_write+0x206/0x4e0 fs/read_write.c:558
 ksys_write+0x199/0x2c0 fs/read_write.c:611
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

The buggy address belongs to the object at ffff8881eba89000
 which belongs to the cache skbuff_head_cache of size 240
The buggy address is located 0 bytes inside of
 240-byte region [ffff8881eba89000, ffff8881eba890f0)
The buggy address belongs to the page:
page:ffffea0007aea240 refcount:1 mapcount:0 mapping:ffff8881f5e79180 index:0x0
flags: 0x8000000000000200(slab)
raw: 8000000000000200 ffffea0007acdec0 0000000800000008 ffff8881f5e79180
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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x18f/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893
 alloc_slab_page+0x39/0x3c0 mm/slub.c:343
 allocate_slab mm/slub.c:1683 [inline]
 new_slab+0x97/0x440 mm/slub.c:1749
 new_slab_objects mm/slub.c:2505 [inline]
 ___slab_alloc+0x2fe/0x490 mm/slub.c:2667
 __slab_alloc+0x62/0xa0 mm/slub.c:2707
 slab_alloc_node mm/slub.c:2792 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0x109/0x250 mm/slub.c:2842
 kmem_cache_alloc_node include/linux/slab.h:427 [inline]
 __alloc_skb+0x7a/0x4d0 net/core/skbuff.c:198
 alloc_skb include/linux/skbuff.h:1080 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1193 [inline]
 netlink_sendmsg+0x797/0xcf0 net/netlink/af_netlink.c:1890
 sock_sendmsg_nosec net/socket.c:638 [inline]
 __sock_sendmsg net/socket.c:650 [inline]
 ____sys_sendmsg+0x5ac/0x8f0 net/socket.c:2306
 ___sys_sendmsg net/socket.c:2360 [inline]
 __sys_sendmsg+0x28b/0x380 net/socket.c:2406
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
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+0x297/0x380 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 mm/page_alloc.c:4961 [inline]
 free_pages+0x114/0x1b0 mm/page_alloc.c:4969
 selinux_genfs_get_sid+0x217/0x260 security/selinux/hooks.c:1376
 inode_doinit_with_dentry+0x892/0x1050 security/selinux/hooks.c:1571
 security_d_instantiate+0x97/0xf0 security/security.c:1913
 d_splice_alias+0x6b/0x3b0 fs/dcache.c:3017
 kernfs_iop_lookup+0x17c/0x200 fs/kernfs/dir.c:1123
 lookup_open fs/namei.c:3358 [inline]
 do_last fs/namei.c:3471 [inline]
 path_openat+0x15c9/0x34b0 fs/namei.c:3683
 do_filp_open+0x20b/0x450 fs/namei.c:3713
 do_sys_open+0x39c/0x810 fs/open.c:1123
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Memory state around the buggy address:
 ffff8881eba88f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881eba88f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881eba89000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8881eba89080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
 ffff8881eba89100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
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