================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x94b/0x1e90 fs/ext4/xattr.c:1790 Read of size 18446744073709551572 at addr ffff8880316d9050 by task syz.2.35/6000 CPU: 1 PID: 6000 Comm: syz.2.35 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xac/0x220 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x288/0x290 mm/kasan/generic.c:187 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94 ext4_xattr_set_entry+0x94b/0x1e90 fs/ext4/xattr.c:1790 ext4_xattr_block_set+0xae3/0x32a0 fs/ext4/xattr.c:2037 ext4_xattr_move_to_block fs/ext4/xattr.c:2674 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2749 [inline] ext4_expand_extra_isize_ea+0x10ea/0x19e0 fs/ext4/xattr.c:2841 __ext4_expand_extra_isize+0x306/0x400 fs/ext4/inode.c:5953 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5996 [inline] __ext4_mark_inode_dirty+0x45d/0x6e0 fs/ext4/inode.c:6074 __ext4_unlink+0x623/0xa80 fs/ext4/namei.c:3342 ext4_unlink+0x1ac/0x500 fs/ext4/namei.c:3371 vfs_unlink+0x389/0x600 fs/namei.c:4325 do_unlinkat+0x328/0x570 fs/namei.c:4391 __do_sys_unlink fs/namei.c:4439 [inline] __se_sys_unlink fs/namei.c:4437 [inline] __x64_sys_unlink+0x49/0x50 fs/namei.c:4437 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f3648b8ebe9 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:00007f364999d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 00007f3648db6090 RCX: 00007f3648b8ebe9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000180 RBP: 00007f3648c11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3648db6128 R14: 00007f3648db6090 R15: 00007ffc5cdf0b68 Allocated by task 6000: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc_node_track_caller+0xb2/0x230 mm/slab_common.c:1027 kmemdup+0x2b/0x70 mm/util.c:131 kmemdup include/linux/fortify-string.h:779 [inline] ext4_xattr_block_set+0x9e5/0x32a0 fs/ext4/xattr.c:1985 ext4_xattr_move_to_block fs/ext4/xattr.c:2674 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2749 [inline] ext4_expand_extra_isize_ea+0x10ea/0x19e0 fs/ext4/xattr.c:2841 __ext4_expand_extra_isize+0x306/0x400 fs/ext4/inode.c:5953 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5996 [inline] __ext4_mark_inode_dirty+0x45d/0x6e0 fs/ext4/inode.c:6074 __ext4_unlink+0x623/0xa80 fs/ext4/namei.c:3342 ext4_unlink+0x1ac/0x500 fs/ext4/namei.c:3371 vfs_unlink+0x389/0x600 fs/namei.c:4325 do_unlinkat+0x328/0x570 fs/namei.c:4391 __do_sys_unlink fs/namei.c:4439 [inline] __se_sys_unlink fs/namei.c:4437 [inline] __x64_sys_unlink+0x49/0x50 fs/namei.c:4437 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff8880316d9000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 80 bytes inside of 1024-byte region [ffff8880316d9000, ffff8880316d9400) The buggy address belongs to the physical page: page:ffffea0000c5b600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x316d8 head:ffffea0000c5b600 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888017841dc0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 1306, tgid 1306 (kworker/u4:7), ts 91056545411, free_ts 91009954021 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554 prep_new_page mm/page_alloc.c:1561 [inline] get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457 alloc_slab_page+0x5d/0x170 mm/slub.c:1876 allocate_slab mm/slub.c:2023 [inline] new_slab+0x87/0x2e0 mm/slub.c:2076 ___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230 __slab_alloc mm/slub.c:3329 [inline] __slab_alloc_node mm/slub.c:3382 [inline] slab_alloc_node mm/slub.c:3475 [inline] __kmem_cache_alloc_node+0x1a2/0x260 mm/slub.c:3524 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0xa4/0x240 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:721 [inline] ieee802_11_parse_elems_full+0xb9/0x2080 net/mac80211/util.c:1616 ieee802_11_parse_elems_crc net/mac80211/ieee80211_i.h:2337 [inline] ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2344 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline] ieee80211_ibss_rx_queued_mgmt+0x49b/0x2ac0 net/mac80211/ibss.c:1642 ieee80211_iface_process_skb net/mac80211/iface.c:1643 [inline] ieee80211_iface_work+0x717/0xc70 net/mac80211/iface.c:1697 cfg80211_wiphy_work+0x225/0x260 net/wireless/core.c:437 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1154 [inline] free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429 __slab_free+0x35e/0x410 mm/slub.c:3722 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3485 [inline] slab_alloc mm/slub.c:3493 [inline] __kmem_cache_alloc_lru mm/slub.c:3500 [inline] kmem_cache_alloc_lru+0x115/0x2e0 mm/slub.c:3516 alloc_inode_sb include/linux/fs.h:2946 [inline] ext4_alloc_inode+0x2e/0x580 fs/ext4/super.c:1409 alloc_inode fs/inode.c:261 [inline] iget_locked+0x1ad/0x840 fs/inode.c:1359 __ext4_iget+0x234/0x3e70 fs/ext4/inode.c:4828 ext4_lookup+0x257/0x6d0 fs/ext4/namei.c:1858 lookup_open fs/namei.c:3466 [inline] open_last_lookups fs/namei.c:3556 [inline] path_openat+0x10b8/0x3190 fs/namei.c:3786 do_filp_open+0x1c5/0x3d0 fs/namei.c:3816 do_sys_openat2+0x12c/0x1c0 fs/open.c:1419 do_sys_open fs/open.c:1434 [inline] __do_sys_creat fs/open.c:1512 [inline] __se_sys_creat fs/open.c:1506 [inline] __x64_sys_creat+0x90/0xb0 fs/open.c:1506 Memory state around the buggy address: ffff8880316d8f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880316d8f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880316d9000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8880316d9080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880316d9100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================