syzbot

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BUG: KASAN: slab-use-after-free in hfs_bnode_unhash+0x1d9/0x1f0 fs/hfs/bnode.c:312
Read of size 8 at addr ffff888026ca6c20 by task kswapd0/111

CPU: 1 PID: 111 Comm: kswapd0 Not tainted 6.10.0-rc3-syzkaller-00021-g2ef5971ff345 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:488
 kasan_report+0xd9/0x110 mm/kasan/report.c:601
 hfs_bnode_unhash+0x1d9/0x1f0 fs/hfs/bnode.c:312
 hfs_release_folio+0x42d/0x570 fs/hfs/inode.c:117
 filemap_release_folio+0x1ed/0x280 mm/filemap.c:4173
 shrink_folio_list+0x254a/0x4150 mm/vmscan.c:1394
 evict_folios+0x6e6/0x1bf0 mm/vmscan.c:4553
 try_to_shrink_lruvec+0x618/0x9b0 mm/vmscan.c:4749
 shrink_one+0x3f8/0x7c0 mm/vmscan.c:4788
 shrink_many mm/vmscan.c:4851 [inline]
 lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4951
 shrink_node mm/vmscan.c:5910 [inline]
 kswapd_shrink_node mm/vmscan.c:6720 [inline]
 balance_pgdat+0x1105/0x1970 mm/vmscan.c:6911
 kswapd+0x5ea/0xbf0 mm/vmscan.c:7180
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 7986:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4122 [inline]
 __kmalloc_noprof+0x1ec/0x420 mm/slub.c:4135
 kmalloc_noprof include/linux/slab.h:664 [inline]
 kzalloc_noprof include/linux/slab.h:778 [inline]
 __hfs_bnode_create+0x108/0x860 fs/hfs/bnode.c:259
 hfs_bnode_find+0x2d1/0xc50 fs/hfs/bnode.c:335
 hfs_brec_find+0x2af/0x510 fs/hfs/bfind.c:126
 hfs_cat_create+0x3e8/0xb40 fs/hfs/catalog.c:112
 hfs_create+0x6b/0xf0 fs/hfs/dir.c:202
 lookup_open.isra.0+0x10a1/0x13c0 fs/namei.c:3505
 open_last_lookups fs/namei.c:3574 [inline]
 path_openat+0x92f/0x29f0 fs/namei.c:3804
 do_filp_open+0x1dc/0x430 fs/namei.c:3834
 do_sys_openat2+0x17a/0x1e0 fs/open.c:1405
 do_sys_open fs/open.c:1420 [inline]
 __do_compat_sys_openat fs/open.c:1480 [inline]
 __se_compat_sys_openat fs/open.c:1478 [inline]
 __ia32_compat_sys_openat+0x16e/0x210 fs/open.c:1478
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Freed by task 7679:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240
 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2196 [inline]
 slab_free mm/slub.c:4437 [inline]
 kfree+0x12a/0x3b0 mm/slub.c:4558
 hfs_btree_close+0xac/0x390 fs/hfs/btree.c:154
 hfs_mdb_put+0xbf/0x380 fs/hfs/mdb.c:360
 generic_shutdown_super+0x159/0x3d0 fs/super.c:642
 kill_block_super+0x3b/0x90 fs/super.c:1676
 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473
 deactivate_super+0xde/0x100 fs/super.c:506
 cleanup_mnt+0x222/0x450 fs/namespace.c:1267
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:218
 __do_fast_syscall_32+0x80/0x120 arch/x86/entry/common.c:389
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

The buggy address belongs to the object at ffff888026ca6c00
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 32 bytes inside of
 freed 192-byte region [ffff888026ca6c00, ffff888026ca6cc0)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26ca6
anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffefff(slab)
raw: 00fff00000000000 ffff8880154423c0 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000001ffffefff 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 0x152cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 7777, tgid 7777 (syz-executor.3), ts 170862842329, free_ts 170815776235
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1468
 prep_new_page mm/page_alloc.c:1476 [inline]
 get_page_from_freelist+0x136a/0x2e50 mm/page_alloc.c:3420
 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4678
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x56/0x110 mm/slub.c:2265
 allocate_slab mm/slub.c:2428 [inline]
 new_slab+0x84/0x260 mm/slub.c:2481
 ___slab_alloc+0xdac/0x1870 mm/slub.c:3667
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3757
 __slab_alloc_node mm/slub.c:3810 [inline]
 slab_alloc_node mm/slub.c:3989 [inline]
 __do_kmalloc_node mm/slub.c:4121 [inline]
 kmalloc_node_track_caller_noprof+0x365/0x440 mm/slub.c:4142
 kmemdup_noprof+0x29/0x60 mm/util.c:131
 neigh_parms_alloc+0x82/0x5d0 net/core/neighbour.c:1718
 inetdev_init+0x142/0x580 net/ipv4/devinet.c:281
 inetdev_event+0xb17/0x1800 net/ipv4/devinet.c:1565
 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1992
 call_netdevice_notifiers_extack net/core/dev.c:2030 [inline]
 call_netdevice_notifiers net/core/dev.c:2044 [inline]
 register_netdevice+0x1583/0x1c40 net/core/dev.c:10408
 register_netdev+0x2f/0x50 net/core/dev.c:10512
page last free pid 7777 tgid 7777 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1088 [inline]
 free_unref_page+0x64a/0xe40 mm/page_alloc.c:2583
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3941 [inline]
 slab_alloc_node mm/slub.c:4001 [inline]
 kmalloc_trace_noprof+0x11e/0x310 mm/slub.c:4148
 kmalloc_noprof include/linux/slab.h:660 [inline]
 kzalloc_noprof include/linux/slab.h:778 [inline]
 ref_tracker_alloc+0x17c/0x5b0 lib/ref_tracker.c:203
 __netdev_tracker_alloc include/linux/netdevice.h:4038 [inline]
 netdev_hold include/linux/netdevice.h:4067 [inline]
 netdev_hold include/linux/netdevice.h:4062 [inline]
 rx_queue_add_kobject net/core/net-sysfs.c:1102 [inline]
 net_rx_queue_update_kobjects+0x284/0x5f0 net/core/net-sysfs.c:1160
 register_queue_kobjects net/core/net-sysfs.c:1895 [inline]
 netdev_register_kobject+0x26d/0x3f0 net/core/net-sysfs.c:2140
 register_netdevice+0x12ce/0x1c40 net/core/dev.c:10375
 __ip_tunnel_create+0x37b/0x4c0 net/ipv4/ip_tunnel.c:266
 ip_tunnel_init_net+0x1c2/0x6e0 net/ipv4/ip_tunnel.c:1160
 ops_init+0xb9/0x650 net/core/net_namespace.c:139
 setup_net+0x5fc/0xd60 net/core/net_namespace.c:343
 copy_net_ns+0x4ae/0x880 net/core/net_namespace.c:508
 create_new_namespaces+0x3ea/0xb10 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:228

Memory state around the buggy address:
 ffff888026ca6b00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888026ca6b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888026ca6c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff888026ca6c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888026ca6d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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