================================================================== BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xbe3/0xbf0 fs/ext4/xattr.c:2909 Read of size 4 at addr ffff888116ee5000 by task syz-executor/476 CPU: 0 PID: 476 Comm: syz-executor Not tainted 5.10.237-syzkaller-1007474-gcf6ed0f1511d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 ext4_xattr_delete_inode+0xbe3/0xbf0 fs/ext4/xattr.c:2909 ext4_evict_inode+0x106f/0x16e0 fs/ext4/inode.c:300 evict+0x478/0x910 fs/inode.c:612 iput_final fs/inode.c:1736 [inline] iput+0x638/0x7c0 fs/inode.c:1762 d_delete_notify include/linux/fsnotify.h:267 [inline] vfs_rmdir+0x2bd/0x3e0 fs/namei.c:3865 do_rmdir+0x218/0x620 fs/namei.c:3912 __do_sys_unlinkat fs/namei.c:4076 [inline] __se_sys_unlinkat fs/namei.c:4070 [inline] __x64_sys_unlinkat+0xc7/0xf0 fs/namei.c:4070 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fe9718dc707 Code: 73 01 c3 48 c7 c1 b0 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffcfacb268 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fe9718dc707 RDX: 0000000000000200 RSI: 00007fffcfacc410 RDI: 00000000ffffff9c RBP: 00007fe9719396c6 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000207 R12: 00007fffcfacc410 R13: 00007fe9719396c6 R14: 000000000000c1c5 R15: 0000000000000005 Allocated by task 434: 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:430 [inline] __kasan_slab_alloc+0xbd/0xf0 mm/kasan/common.c:463 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:583 slab_alloc_node mm/slub.c:2947 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc+0x165/0x2e0 mm/slub.c:2960 vm_area_alloc+0x24/0x160 kernel/fork.c:358 __mmap_region mm/mmap.c:1847 [inline] mmap_region+0xaa2/0x19d0 mm/mmap.c:3063 do_mmap+0x7b0/0xe10 mm/mmap.c:1649 vm_mmap_pgoff+0x1e0/0x340 mm/util.c:543 ksys_mmap_pgoff+0xfd/0x1e0 mm/mmap.c:1700 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:86 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 434: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1595 [inline] slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1621 slab_free mm/slub.c:3203 [inline] kmem_cache_free+0x100/0x2d0 mm/slub.c:3219 vm_area_free+0x52/0xf0 kernel/fork.c:386 __free_vma mm/mmap.c:179 [inline] put_vma mm/mmap.c:186 [inline] __vma_adjust+0x12fe/0x1be0 mm/mmap.c:1008 __vma_merge+0x3f9/0x930 mm/mmap.c:1294 vma_merge include/linux/mm.h:2706 [inline] mprotect_fixup+0x406/0x840 mm/mprotect.c:456 do_mprotect_pkey+0x5f6/0x7e0 mm/mprotect.c:622 __do_sys_mprotect mm/mprotect.c:647 [inline] __se_sys_mprotect mm/mprotect.c:644 [inline] __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:644 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888116ee5000 which belongs to the cache vm_area_struct of size 232 The buggy address is located 0 bytes inside of 232-byte region [ffff888116ee5000, ffff888116ee50e8) The buggy address belongs to the page: page:ffffea00045bb940 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x116ee5 flags: 0x4000000000000200(slab) raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100189380 raw: 0000000000000000 00000000000d000d 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 434, ts 49659302855, free_ts 49372247113 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5349 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1808 [inline] new_slab+0x84/0x3f0 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x2a6/0x450 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc+0x1af/0x2e0 mm/slub.c:2960 vm_area_alloc+0x24/0x160 kernel/fork.c:358 __mmap_region mm/mmap.c:1847 [inline] mmap_region+0xaa2/0x19d0 mm/mmap.c:3063 do_mmap+0x7b0/0xe10 mm/mmap.c:1649 vm_mmap_pgoff+0x1e0/0x340 mm/util.c:543 ksys_mmap_pgoff+0xfd/0x1e0 mm/mmap.c:1700 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:86 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] free_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336 free_unref_page_list+0x12e/0x9b0 mm/page_alloc.c:3443 release_pages+0xe38/0xe80 mm/swap.c:1103 __pagevec_release+0x71/0xe0 mm/swap.c:1123 pagevec_release include/linux/pagevec.h:88 [inline] __invalidate_mapping_pages+0x887/0x920 mm/truncate.c:607 invalidate_mapping_pages+0x27/0x30 mm/truncate.c:632 invalidate_bdev+0xa3/0x140 fs/block_dev.c:97 ext4_put_super+0x669/0x9c0 fs/ext4/super.c:1237 generic_shutdown_super+0x149/0x320 fs/super.c:465 kill_block_super+0x7f/0xf0 fs/super.c:1469 deactivate_locked_super+0xa0/0x100 fs/super.c:335 deactivate_super+0xaf/0xe0 fs/super.c:366 cleanup_mnt+0x446/0x500 fs/namespace.c:1118 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125 task_work_run+0x127/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172 Memory state around the buggy address: ffff888116ee4f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888116ee4f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888116ee5000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888116ee5080: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff888116ee5100: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb ==================================================================