================================================================== BUG: KASAN: use-after-free in sanity_check_inode fs/f2fs/inode.c:282 [inline] BUG: KASAN: use-after-free in do_read_inode fs/f2fs/inode.c:422 [inline] BUG: KASAN: use-after-free in f2fs_iget+0x4240/0x4a50 fs/f2fs/inode.c:521 Read of size 4 at addr ffff888054d44348 by task syz.4.539/7939 CPU: 1 PID: 7939 Comm: syz.4.539 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 sanity_check_inode fs/f2fs/inode.c:282 [inline] do_read_inode fs/f2fs/inode.c:422 [inline] f2fs_iget+0x4240/0x4a50 fs/f2fs/inode.c:521 f2fs_nfs_get_inode+0x72/0x100 fs/f2fs/super.c:3108 generic_fh_to_dentry+0x8f/0xe0 fs/libfs.c:1044 exportfs_decode_fh_raw+0x12a/0x5d0 fs/exportfs/expfs.c:436 exportfs_decode_fh+0x36/0x70 fs/exportfs/expfs.c:576 do_handle_to_path fs/fhandle.c:152 [inline] handle_to_path fs/fhandle.c:207 [inline] do_handle_open+0x3df/0x820 fs/fhandle.c:223 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f908698a749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f9084bd0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000130 RAX: ffffffffffffffda RBX: 00007f9086be1090 RCX: 00007f908698a749 RDX: 0000000002000000 RSI: 00002000000000c0 RDI: ffffffffffffff9c RBP: 00007f9086a0ef91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9086be1128 R14: 00007f9086be1090 R15: 00007ffd48142c88 Allocated by task 7938: 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+0x9c/0xd0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x100/0x290 mm/slub.c:3238 f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2631 [inline] f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2641 [inline] __grab_extent_tree fs/f2fs/extent_cache.c:295 [inline] __f2fs_init_extent_tree fs/f2fs/extent_cache.c:381 [inline] f2fs_init_extent_tree+0x518/0xae0 fs/f2fs/extent_cache.c:404 do_read_inode fs/f2fs/inode.c:399 [inline] f2fs_iget+0xfe4/0x4a50 fs/f2fs/inode.c:521 f2fs_nfs_get_inode+0x72/0x100 fs/f2fs/super.c:3108 generic_fh_to_dentry+0x8f/0xe0 fs/libfs.c:1044 exportfs_decode_fh_raw+0x12a/0x5d0 fs/exportfs/expfs.c:436 exportfs_decode_fh+0x36/0x70 fs/exportfs/expfs.c:576 do_handle_to_path fs/fhandle.c:152 [inline] handle_to_path fs/fhandle.c:207 [inline] do_handle_open+0x3df/0x820 fs/fhandle.c:223 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 7938: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1710 [inline] slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736 slab_free mm/slub.c:3504 [inline] kmem_cache_free+0x8f/0x210 mm/slub.c:3520 f2fs_destroy_extent_tree+0x3b3/0x670 fs/f2fs/extent_cache.c:845 f2fs_evict_inode+0x3c4/0x15b0 fs/f2fs/inode.c:776 evict+0x485/0x870 fs/inode.c:647 f2fs_iget+0x16ad/0x4a50 fs/f2fs/inode.c:573 f2fs_nfs_get_inode+0x72/0x100 fs/f2fs/super.c:3108 generic_fh_to_dentry+0x8f/0xe0 fs/libfs.c:1044 exportfs_decode_fh_raw+0x12a/0x5d0 fs/exportfs/expfs.c:436 exportfs_decode_fh+0x36/0x70 fs/exportfs/expfs.c:576 do_handle_to_path fs/fhandle.c:152 [inline] handle_to_path fs/fhandle.c:207 [inline] do_handle_open+0x3df/0x820 fs/fhandle.c:223 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888054d44320 which belongs to the cache f2fs_extent_tree of size 136 The buggy address is located 40 bytes inside of 136-byte region [ffff888054d44320, ffff888054d443a8) The buggy address belongs to the page: page:ffffea0001535100 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888054d44258 pfn:0x54d44 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888146ba4640 raw: ffff888054d44258 0000000080140010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x112c50(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 5132, ts 107566413973, free_ts 106126932114 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x195/0x290 mm/slub.c:3238 f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2631 [inline] f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2641 [inline] __grab_extent_tree fs/f2fs/extent_cache.c:295 [inline] __f2fs_init_extent_tree fs/f2fs/extent_cache.c:381 [inline] f2fs_init_extent_tree+0x518/0xae0 fs/f2fs/extent_cache.c:404 f2fs_new_inode+0x98b/0x1170 fs/f2fs/namei.c:108 f2fs_create+0x15a/0x14f0 fs/f2fs/namei.c:357 lookup_open fs/namei.c:3470 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0x11e1/0x2f30 fs/namei.c:3747 do_filp_open+0x1b3/0x3e0 fs/namei.c:3777 do_sys_openat2+0x142/0x4a0 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1280 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 free_slab mm/slub.c:2020 [inline] discard_slab mm/slub.c:2026 [inline] __unfreeze_partials+0x1a5/0x200 mm/slub.c:2512 put_cpu_partial+0x12d/0x190 mm/slub.c:2592 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc_trace+0x103/0x2a0 mm/slub.c:3250 kmalloc include/linux/slab.h:607 [inline] kzalloc include/linux/slab.h:738 [inline] kobject_uevent_env+0x27a/0x890 lib/kobject_uevent.c:539 __device_release_driver drivers/base/dd.c:1251 [inline] device_release_driver_internal+0x67b/0x750 drivers/base/dd.c:1262 bus_remove_device+0x2e2/0x400 drivers/base/bus.c:531 device_del+0x628/0xa70 drivers/base/core.c:3600 usb_disconnect+0x573/0x8a0 drivers/usb/core/hub.c:2313 hub_port_connect drivers/usb/core/hub.c:5341 [inline] hub_port_connect_change drivers/usb/core/hub.c:5637 [inline] port_event drivers/usb/core/hub.c:5799 [inline] hub_event+0x1e9f/0x5560 drivers/usb/core/hub.c:5881 process_one_work+0x863/0x1000 kernel/workqueue.c:2310 Memory state around the buggy address: ffff888054d44200: fb fb fb fc fc fc fc fc fc fc fc fb fb fb fb fb ffff888054d44280: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff888054d44300: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb ^ ffff888054d44380: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc ffff888054d44400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================