================================================================== BUG: KASAN: use-after-free in ext4_htree_fill_tree+0x131b/0x13e0 fs/ext4/namei.c:1246 Read of size 1 at addr ffff88810f7cea67 by task syz-executor/360 CPU: 1 PID: 360 Comm: syz-executor Not tainted 5.15.173-syzkaller-00161-gb4bd207b0380 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1c0 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_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 ext4_htree_fill_tree+0x131b/0x13e0 fs/ext4/namei.c:1246 ext4_dx_readdir fs/ext4/dir.c:606 [inline] ext4_readdir+0x2f75/0x3960 fs/ext4/dir.c:142 iterate_dir+0x265/0x600 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0x1c1/0x460 fs/readdir.c:354 __x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354 x64_sys_call+0x5ae/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:218 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f5563096693 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 82 3e f8 ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8 RSP: 002b:00007fff791c08e8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 000055558690f4e0 RCX: 00007f5563096693 RDX: 0000000000008000 RSI: 000055558690f4e0 RDI: 0000000000000005 RBP: 000055558690f4b4 R08: 0000000000028b61 R09: 0000000000000000 R10: 00007f5563229ca0 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000010 R14: 000055558690f4b0 R15: 0000000000000001 Allocated by task 357: 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_slab_alloc+0xb1/0xe0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3240 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc+0xf5/0x250 mm/slub.c:3255 kmem_cache_zalloc include/linux/slab.h:723 [inline] lsm_inode_alloc security/security.c:595 [inline] security_inode_alloc+0x29/0x120 security/security.c:1033 inode_init_always+0x76d/0x9d0 fs/inode.c:207 alloc_inode fs/inode.c:243 [inline] new_inode_pseudo+0x93/0x220 fs/inode.c:976 new_inode+0x28/0x1c0 fs/inode.c:1005 proc_get_inode+0x24/0x6d0 fs/proc/inode.c:649 proc_lookup_de+0x253/0x300 fs/proc/generic.c:254 proc_lookup+0xbe/0xe0 fs/proc/generic.c:272 proc_root_lookup+0x3a/0x50 fs/proc/root.c:325 __lookup_slow+0x2b9/0x400 fs/namei.c:1663 lookup_slow+0x5a/0x80 fs/namei.c:1680 walk_component+0x48c/0x610 fs/namei.c:1976 link_path_walk+0x642/0xd90 path_lookupat+0xa0/0x450 fs/namei.c:2454 filename_lookup+0x230/0x5c0 fs/namei.c:2484 user_path_at_empty+0x43/0x1a0 fs/namei.c:2883 user_path_at include/linux/namei.h:57 [inline] do_mount fs/namespace.c:3352 [inline] __do_sys_mount fs/namespace.c:3563 [inline] __se_sys_mount+0x285/0x3b0 fs/namespace.c:3540 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3540 x64_sys_call+0x49d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 13: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749 slab_free mm/slub.c:3521 [inline] kmem_cache_free+0x115/0x330 mm/slub.c:3539 inode_free_by_rcu+0x1c/0x20 security/security.c:1048 rcu_do_batch+0x57a/0xc10 kernel/rcu/tree.c:2523 rcu_core+0x517/0x1020 kernel/rcu/tree.c:2763 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776 handle_softirqs+0x25e/0x5c0 kernel/softirq.c:565 run_ksoftirqd+0x28/0x40 kernel/softirq.c:941 smpboot_thread_fn+0x466/0x8d0 kernel/smpboot.c:164 kthread+0x421/0x510 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 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+0x123/0x10b0 kernel/rcu/tree.c:3125 security_inode_free+0xb3/0xd0 security/security.c:1065 __destroy_inode+0x179/0x4e0 fs/inode.c:261 destroy_inode fs/inode.c:284 [inline] evict+0x7d6/0x930 fs/inode.c:637 iput_final fs/inode.c:1744 [inline] iput+0x63b/0x7e0 fs/inode.c:1770 dentry_unlink_inode+0x34e/0x430 fs/dcache.c:380 __dentry_kill+0x447/0x660 fs/dcache.c:586 shrink_dentry_list+0x35e/0x4b0 fs/dcache.c:1181 shrink_dcache_parent+0xc9/0x340 do_one_tree+0x27/0xe0 fs/dcache.c:1662 shrink_dcache_for_umount+0x7d/0x120 fs/dcache.c:1679 generic_shutdown_super+0x66/0x330 fs/super.c:447 kill_anon_super+0x3d/0x70 fs/super.c:1089 proc_kill_sb+0x8d/0xd0 fs/proc/root.c:275 deactivate_locked_super+0xad/0x110 fs/super.c:335 deactivate_super+0xbe/0xf0 fs/super.c:366 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150 task_work_run+0x129/0x190 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xc48/0x2ca0 kernel/exit.c:880 do_group_exit+0x141/0x310 kernel/exit.c:1002 get_signal+0x7a3/0x1630 kernel/signal.c:2907 arch_do_signal_or_restart+0xbd/0x1680 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0xa0/0xe0 kernel/entry/common.c:178 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88810f7cea50 which belongs to the cache lsm_inode_cache of size 56 The buggy address is located 23 bytes inside of 56-byte region [ffff88810f7cea50, ffff88810f7cea88) The buggy address belongs to the page: page:ffffea00043df380 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10f7ce flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 dead000000000122 ffff888100186300 raw: 0000000000000000 00000000002e002e 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 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 357, ts 24240561104, free_ts 24233862053 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5779 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:3250 [inline] kmem_cache_alloc+0x139/0x250 mm/slub.c:3255 kmem_cache_zalloc include/linux/slab.h:723 [inline] lsm_inode_alloc security/security.c:595 [inline] security_inode_alloc+0x29/0x120 security/security.c:1033 inode_init_always+0x76d/0x9d0 fs/inode.c:207 alloc_inode fs/inode.c:243 [inline] new_inode_pseudo+0x93/0x220 fs/inode.c:976 sock_alloc net/socket.c:626 [inline] sock_create_lite+0x8d/0x500 net/socket.c:1285 __netlink_kernel_create+0x12f/0x910 net/netlink/af_netlink.c:2047 netlink_kernel_create include/linux/netlink.h:62 [inline] uevent_net_init+0xe0/0x2d0 lib/kobject_uevent.c:785 ops_init+0x1cd/0x4a0 net/core/net_namespace.c:138 setup_net+0x34b/0xb50 net/core/net_namespace.c:332 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3534 free_unref_page_list+0x14b/0xa60 mm/page_alloc.c:3671 release_pages+0x1310/0x1370 mm/swap.c:1009 free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:320 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu mm/mmu_gather.c:247 [inline] tlb_finish_mmu+0x177/0x320 mm/mmu_gather.c:338 exit_mmap+0x40d/0x940 mm/mmap.c:3218 __mmput+0x95/0x310 kernel/fork.c:1180 mmput+0x5b/0x170 kernel/fork.c:1203 exit_mm kernel/exit.c:554 [inline] do_exit+0xb9c/0x2ca0 kernel/exit.c:867 do_group_exit+0x141/0x310 kernel/exit.c:1002 __do_sys_exit_group kernel/exit.c:1013 [inline] __se_sys_exit_group kernel/exit.c:1011 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1011 x64_sys_call+0x610/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff88810f7ce900: fb fb fb fb fb fc fc fc fc 00 00 00 00 00 00 00 ffff88810f7ce980: fc fc fc fc 00 00 00 00 00 00 00 fc fc fc fc fa >ffff88810f7cea00: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb ^ ffff88810f7cea80: fb fc fc fc fc 00 00 00 00 00 00 00 fc fc fc fc ffff88810f7ceb00: 00 00 00 00 00 00 00 fc fc fc fc 00 00 00 00 00 ==================================================================