================================================================== BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2911 Read of size 4 at addr ffff88811221e000 by task syz-executor/468 CPU: 0 PID: 468 Comm: syz-executor Not tainted 5.15.176-syzkaller-1078825-gd1a25a6a4b3b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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_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: 0033:0x7f0df7305cf7 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:00007ffea88ff718 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f0df7305cf7 RDX: 0000000000000200 RSI: 00007ffea89008c0 RDI: 00000000ffffff9c RBP: 00007f0df73791cc R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffea89008c0 R13: 00007f0df73791cc R14: 000000000000d545 R15: 00007ffea8902a70 Allocated by task 188: 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_dup+0x26/0x230 kernel/fork.c:368 dup_mmap kernel/fork.c:602 [inline] dup_mm kernel/fork.c:1522 [inline] copy_mm+0x9a1/0x13e0 kernel/fork.c:1574 copy_process+0x1149/0x3290 kernel/fork.c:2263 kernel_clone+0x21e/0x9e0 kernel/fork.c:2661 __do_sys_clone kernel/fork.c:2787 [inline] __se_sys_clone kernel/fork.c:2771 [inline] __x64_sys_clone+0x23f/0x290 kernel/fork.c:2771 x64_sys_call+0x1b0/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:57 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 0: 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 __do_softirq kernel/softirq.c:603 [inline] invoke_softirq kernel/softirq.c:425 [inline] __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:652 irq_exit_rcu+0x9/0x10 kernel/softirq.c:664 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676 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 exec_mmap+0x46b/0x510 fs/exec.c:1047 begin_new_exec+0xbcf/0x1f40 fs/exec.c:1306 load_elf_binary+0x945/0x2750 fs/binfmt_elf.c:1001 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 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 do_munmap mm/mmap.c:2924 [inline] munmap_vma_range mm/mmap.c:605 [inline] __mmap_region mm/mmap.c:1757 [inline] mmap_region+0xadb/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+0x15d/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 The buggy address belongs to the object at ffff88811221e000 which belongs to the cache vm_area_struct of size 232 The buggy address is located 0 bytes inside of 232-byte region [ffff88811221e000, ffff88811221e0e8) The buggy address belongs to the page: page:ffffea0004488780 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811221eb90 pfn:0x11221e flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea00044887c8 ffffea0004488548 ffff888100187200 raw: ffff88811221eb90 00000000000d0004 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 116, ts 4690299448, free_ts 0 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_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+0x15d/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 page_owner free stack trace missing Memory state around the buggy address: ffff88811221df00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811221df80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811221e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811221e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff88811221e100: fc fc fc fc fc fb fb fb fb fb fb fb fb fb 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