================================================================== BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2911 Read of size 4 at addr ffff88810d35d000 by task syz-executor/469 CPU: 0 PID: 469 Comm: syz-executor Not tainted 5.15.178-syzkaller-1079147-g7d1f9b5c2ff5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2911 ext4_evict_inode+0xea1/0x14e0 fs/ext4/inode.c:300 evict+0x529/0x930 fs/inode.c:622 iput_final fs/inode.c:1744 [inline] iput+0x63b/0x7e0 fs/inode.c:1770 d_delete_notify include/linux/fsnotify.h:278 [inline] vfs_rmdir+0x359/0x470 fs/namei.c:4162 do_rmdir+0x3ab/0x630 fs/namei.c:4210 __do_sys_unlinkat fs/namei.c:4390 [inline] __se_sys_unlinkat fs/namei.c:4384 [inline] __x64_sys_unlinkat+0xdf/0xf0 fs/namei.c:4384 x64_sys_call+0x6e9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:264 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: 0033:0x7fa1c07d75d7 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:00007ffee136d198 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fa1c07d75d7 RDX: 0000000000000200 RSI: 00007ffee136e340 RDI: 00000000ffffff9c RBP: 00007fa1c084a134 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffee136e340 R13: 00007fa1c084a134 R14: 000000000000d5aa R15: 00007ffee13704f0 Allocated by task 316: 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 vm_area_alloc+0x24/0x130 kernel/fork.c:360 __mmap_region mm/mmap.c:1782 [inline] mmap_region+0xc9a/0x1a80 mm/mmap.c:2947 do_mmap+0x776/0xe50 mm/mmap.c:1586 vm_mmap_pgoff+0x1dd/0x450 mm/util.c:555 ksys_mmap_pgoff+0xed/0x1e0 mm/mmap.c:1635 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:86 x64_sys_call+0x67/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:10 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 __free_vm_area_struct+0x1c/0x20 kernel/fork.c:390 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 free_vm_area_struct kernel/fork.c:395 [inline] vm_area_free_no_check+0xff/0x130 kernel/fork.c:409 vm_area_free+0x53/0x60 kernel/fork.c:419 remove_vma mm/mmap.c:190 [inline] exit_mmap+0x556/0x990 mm/mmap.c:3242 __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 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 Second to 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 free_vm_area_struct kernel/fork.c:395 [inline] vm_area_free_no_check+0xff/0x130 kernel/fork.c:409 vm_area_free+0x53/0x60 kernel/fork.c:419 remove_vma mm/mmap.c:190 [inline] remove_vma_list mm/mmap.c:2639 [inline] __do_munmap+0x1616/0x19d0 mm/mmap.c:2916 __vm_munmap+0x166/0x2a0 mm/mmap.c:2966 vm_munmap+0x1f/0x30 mm/mmap.c:2984 elf_map+0x210/0x240 fs/binfmt_elf.c:390 load_elf_binary+0xfe0/0x2750 fs/binfmt_elf.c:1141 search_binary_handler fs/exec.c:1755 [inline] exec_binprm fs/exec.c:1796 [inline] bprm_execve+0x7ae/0x14a0 fs/exec.c:1865 do_execveat_common+0x565/0x710 fs/exec.c:1970 do_execve fs/exec.c:2040 [inline] __do_sys_execve fs/exec.c:2116 [inline] __se_sys_execve fs/exec.c:2111 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2111 x64_sys_call+0x1c5/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:60 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 The buggy address belongs to the object at ffff88810d35d000 which belongs to the cache vm_area_struct of size 232 The buggy address is located 0 bytes inside of 232-byte region [ffff88810d35d000, ffff88810d35d0e8) The buggy address belongs to the page: page:ffffea000434d740 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88810d35da68 pfn:0x10d35d flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea00043646c8 ffffea0004361d08 ffff888100186c00 raw: ffff88810d35da68 00000000000d0002 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), pid 99, ts 4407994466, free_ts 4407967123 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:5780 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 vm_area_dup+0x26/0x230 kernel/fork.c:368 __split_vma+0xc0/0x410 mm/mmap.c:2741 __do_munmap+0x390/0x19d0 mm/mmap.c:2870 __vm_munmap+0x166/0x2a0 mm/mmap.c:2966 vm_munmap+0x1f/0x30 mm/mmap.c:2984 elf_map+0x210/0x240 fs/binfmt_elf.c:390 load_elf_binary+0xfe0/0x2750 fs/binfmt_elf.c:1141 search_binary_handler fs/exec.c:1755 [inline] exec_binprm fs/exec.c:1796 [inline] bprm_execve+0x7ae/0x14a0 fs/exec.c:1865 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 shift_arg_pages fs/exec.c:737 [inline] setup_arg_pages+0x9db/0xb70 fs/exec.c:837 load_elf_binary+0xbab/0x2750 fs/binfmt_elf.c:1018 search_binary_handler fs/exec.c:1755 [inline] exec_binprm fs/exec.c:1796 [inline] bprm_execve+0x7ae/0x14a0 fs/exec.c:1865 do_execveat_common+0x565/0x710 fs/exec.c:1970 do_execve fs/exec.c:2040 [inline] __do_sys_execve fs/exec.c:2116 [inline] __se_sys_execve fs/exec.c:2111 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2111 x64_sys_call+0x1c5/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:60 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: ffff88810d35cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810d35cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88810d35d000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810d35d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff88810d35d100: fc fc fc fc fc fb fb fb fb fb fb fb fb fb fb fb ==================================================================