================================================================== BUG: KASAN: use-after-free in d_inode include/linux/dcache.h:526 [inline] BUG: KASAN: use-after-free in relay_switch_subbuf+0x285/0x6e0 kernel/relay.c:676 Read of size 8 at addr ffff8880905ec7c0 by task syz-executor.0/3543 CPU: 0 PID: 3543 Comm: syz-executor.0 Not tainted 5.15.134-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 d_inode include/linux/dcache.h:526 [inline] relay_switch_subbuf+0x285/0x6e0 kernel/relay.c:676 relay_reserve include/linux/relay.h:248 [inline] trace_note+0x553/0x6f0 kernel/trace/blktrace.c:95 trace_note_tsk+0xa9/0x140 kernel/trace/blktrace.c:126 __blk_add_trace+0x9f5/0xd70 kernel/trace/blktrace.c:267 blk_add_trace_bio+0x280/0x2d0 kernel/trace/blktrace.c:905 trace_block_bio_queue include/trace/events/block.h:332 [inline] submit_bio_checks+0x182c/0x1920 block/blk-core.c:893 __submit_bio+0x5a1/0x850 block/blk-core.c:917 __submit_bio_noacct_mq block/blk-core.c:1003 [inline] submit_bio_noacct+0x955/0xb30 block/blk-core.c:1033 submit_bio+0x2dd/0x560 block/blk-core.c:1095 submit_bio_wait+0x102/0x200 block/bio.c:1229 blkdev_issue_flush+0x17e/0x230 block/blk-flush.c:460 nilfs_flush_device fs/nilfs2/the_nilfs.h:380 [inline] nilfs_sync_fs+0x604/0x760 fs/nilfs2/super.c:536 sync_filesystem+0x1bc/0x220 fs/sync.c:66 generic_shutdown_super+0x6e/0x2c0 fs/super.c:448 kill_block_super+0x7a/0xe0 fs/super.c:1414 deactivate_locked_super+0xa0/0x110 fs/super.c:335 cleanup_mnt+0x44e/0x500 fs/namespace.c:1143 task_work_run+0x129/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fa2e4e91e17 Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffd698b3828 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fa2e4e91e17 RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffd698b38e0 RBP: 00007ffd698b38e0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd698b49a0 R13: 00007fa2e4edb3b9 R14: 00000000000a1de3 R15: 0000000000000003 Allocated by task 3552: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233 __d_alloc+0x2a/0x700 fs/dcache.c:1744 d_alloc_pseudo+0x19/0x70 fs/dcache.c:1873 alloc_file_pseudo+0x131/0x2f0 fs/file_table.c:225 sock_alloc_file+0xb4/0x240 net/socket.c:462 sock_map_fd net/socket.c:486 [inline] __sys_socket+0x194/0x370 net/socket.c:1564 __do_sys_socket net/socket.c:1569 [inline] __se_sys_socket net/socket.c:1567 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1567 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 Freed by task 3552: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0x91/0x1f0 mm/slub.c:3515 __dentry_kill+0x4f4/0x650 fs/dcache.c:596 dentry_kill+0xbb/0x290 dput+0x1f1/0x420 fs/dcache.c:888 __fput+0x5ec/0x890 fs/file_table.c:288 task_work_run+0x129/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb Last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2994 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3074 __dentry_kill+0x4f4/0x650 fs/dcache.c:596 shrink_dentry_list+0x398/0x6a0 fs/dcache.c:1176 shrink_dcache_parent+0xc9/0x480 vfs_rmdir+0x34e/0x460 fs/namei.c:4082 do_rmdir+0x362/0x670 fs/namei.c:4139 __do_sys_unlinkat fs/namei.c:4319 [inline] __se_sys_unlinkat fs/namei.c:4313 [inline] __x64_sys_unlinkat+0xdc/0xf0 fs/namei.c:4313 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 Second to last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2994 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3074 __dentry_kill+0x4f4/0x650 fs/dcache.c:596 shrink_dentry_list+0x398/0x6a0 fs/dcache.c:1176 shrink_dcache_parent+0xc9/0x480 vfs_rmdir+0x34e/0x460 fs/namei.c:4082 do_rmdir+0x362/0x670 fs/namei.c:4139 __do_sys_unlinkat fs/namei.c:4319 [inline] __se_sys_unlinkat fs/namei.c:4313 [inline] __x64_sys_unlinkat+0xdc/0xf0 fs/namei.c:4313 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 The buggy address belongs to the object at ffff8880905ec758 which belongs to the cache dentry of size 312 The buggy address is located 104 bytes inside of 312-byte region [ffff8880905ec758, ffff8880905ec890) The buggy address belongs to the page: page:ffffea0002417b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x905ec head:ffffea0002417b00 order:1 compound_mapcount:0 memcg:ffff888021b95c01 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888140007640 raw: 0000000000000000 0000000000150015 00000001ffffffff ffff888021b95c01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 3554, ts 286160186057, free_ts 0 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159 __alloc_pages+0x272/0x700 mm/page_alloc.c:5421 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xbb/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x18e/0x280 mm/slub.c:3233 __d_alloc+0x2a/0x700 fs/dcache.c:1744 d_alloc fs/dcache.c:1823 [inline] d_alloc_parallel+0xca/0x1390 fs/dcache.c:2575 __lookup_slow+0x111/0x3d0 fs/namei.c:1644 lookup_one_len+0x187/0x2d0 fs/namei.c:2688 start_creating+0x17f/0x310 fs/debugfs/inode.c:352 __debugfs_create_file+0x73/0x530 fs/debugfs/inode.c:397 cfg80211_debugfs_rdev_add+0xb3/0xe0 net/wireless/debugfs.c:109 wiphy_register+0x1edb/0x2bb0 net/wireless/core.c:930 ieee80211_register_hw+0x2986/0x39d0 net/mac80211/main.c:1299 mac80211_hwsim_new_radio+0x223d/0x4200 drivers/net/wireless/mac80211_hwsim.c:3374 hwsim_new_radio_nl+0xbae/0x1090 drivers/net/wireless/mac80211_hwsim.c:3950 page_owner free stack trace missing Memory state around the buggy address: ffff8880905ec680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880905ec700: fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb >ffff8880905ec780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880905ec800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880905ec880: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb ==================================================================