EXT4-fs (loop4): mounted filesystem without journal. Opts: grpquota,delalloc,resuid=0x0000000000000000,debug,dioread_nolock,bsddf,nomblk_io_submit,noauto_da_alloc,,errors=continue. Quota mode: writeback. ================================================================== BUG: KASAN: use-after-free in ext4_get_inode_usage+0x401/0x5b0 fs/ext4/xattr.c:821 Read of size 4 at addr ffff888029f01070 by task syz.4.368/5839 CPU: 0 PID: 5839 Comm: syz.4.368 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: dump_stack_lvl+0x188/0x250 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 ext4_get_inode_usage+0x401/0x5b0 fs/ext4/xattr.c:821 __dquot_transfer+0x177/0x2270 fs/quota/dquot.c:2015 dquot_transfer+0x2f1/0x460 fs/quota/dquot.c:2167 ext4_setattr+0x735/0x1b60 fs/ext4/inode.c:5477 notify_change+0xbcd/0xee0 fs/attr.c:505 chown_common+0x4a7/0x660 fs/open.c:680 vfs_fchown fs/open.c:748 [inline] ksys_fchown+0xe2/0x150 fs/open.c:759 __do_sys_fchown fs/open.c:767 [inline] __se_sys_fchown fs/open.c:765 [inline] __x64_sys_fchown+0x76/0x80 fs/open.c:765 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: 0033:0x7fc1ea198e59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc1e83f2028 EFLAGS: 00000246 ORIG_RAX: 000000000000005d RAX: ffffffffffffffda RBX: 00007fc1ea411fa0 RCX: 00007fc1ea198e59 RDX: 000000000000ee01 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007fc1ea22ed6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc1ea412038 R14: 00007fc1ea411fa0 R15: 00007fffccf986c8 Allocated by task 5549: 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_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522 kmalloc_array_node include/linux/slab.h:700 [inline] kcalloc_node include/linux/slab.h:705 [inline] memcg_alloc_page_obj_cgroups+0x81/0x120 mm/memcontrol.c:2839 account_slab_page mm/slab.h:424 [inline] allocate_slab mm/slub.c:1933 [inline] new_slab+0x100/0x4b0 mm/slub.c:1980 ___slab_alloc+0x80a/0xdd0 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 vm_area_dup kernel/fork.c:358 [inline] dup_mmap kernel/fork.c:557 [inline] dup_mm kernel/fork.c:1466 [inline] copy_mm+0x8cd/0x13f0 kernel/fork.c:1518 copy_process+0x17eb/0x3e20 kernel/fork.c:2290 kernel_clone+0x23f/0x990 kernel/fork.c:2679 __do_sys_clone kernel/fork.c:2796 [inline] __se_sys_clone kernel/fork.c:2780 [inline] __x64_sys_clone+0x19a/0x210 kernel/fork.c:2780 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 4457: 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] kfree+0xef/0x2a0 mm/slub.c:4564 memcg_free_page_obj_cgroups mm/slab.h:255 [inline] unaccount_slab_page mm/slab.h:434 [inline] __free_slab+0x135/0x370 mm/slub.c:2004 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+0x100/0x290 mm/slub.c:3238 getname_flags+0xb5/0x500 fs/namei.c:138 getname fs/namei.c:217 [inline] __do_sys_rename fs/namei.c:5039 [inline] __se_sys_rename fs/namei.c:5037 [inline] __x64_sys_rename+0x5b/0x90 fs/namei.c:5037 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 Last potentially related work creation: kasan_save_stack+0x35/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3011 [inline] call_rcu+0x189/0x950 kernel/rcu/tree.c:3091 nf_hook_entries_free net/netfilter/core.c:88 [inline] __nf_register_net_hook+0x6fe/0x850 net/netfilter/core.c:419 nf_register_net_hook+0xae/0x190 net/netfilter/core.c:536 nf_register_net_hooks+0x40/0x1a0 net/netfilter/core.c:552 ipt_register_table+0x54b/0x800 net/ipv4/netfilter/ip_tables.c:1782 iptable_mangle_table_init+0x3d/0x60 net/ipv4/netfilter/iptable_mangle.c:91 xt_find_table_lock+0x220/0x360 net/netfilter/x_tables.c:1282 xt_request_find_table_lock+0x22/0x100 net/netfilter/x_tables.c:1307 get_info net/ipv4/netfilter/ip_tables.c:964 [inline] do_ipt_get_ctl+0x6df/0x1110 net/ipv4/netfilter/ip_tables.c:1660 nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x1256/0x16a0 net/ipv4/ip_sockglue.c:1797 tcp_getsockopt+0x200/0x25a0 net/ipv4/tcp.c:4322 __sys_getsockopt+0x1b0/0x230 net/socket.c:2256 __do_sys_getsockopt net/socket.c:2271 [inline] __se_sys_getsockopt net/socket.c:2268 [inline] __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2268 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 ffff888029f01000 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 112 bytes inside of 128-byte region [ffff888029f01000, ffff888029f01080) The buggy address belongs to the page: page:ffffea0000a7c040 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29f01 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00008ce500 0000000a0000000a ffff888016c418c0 raw: 0000000000000000 0000000000100010 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 4190, ts 76396484522, free_ts 76396264906 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501 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+0x80a/0xdd0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] __kmalloc_node+0x200/0x3b0 mm/slub.c:4456 kmalloc_node include/linux/slab.h:630 [inline] kvmalloc_node+0x84/0x130 mm/util.c:619 kvmalloc include/linux/mm.h:816 [inline] kvzalloc include/linux/mm.h:824 [inline] allocate_hook_entries_size net/netfilter/core.c:61 [inline] nf_hook_entries_grow+0x309/0x730 net/netfilter/core.c:128 __nf_register_net_hook+0x238/0x850 net/netfilter/core.c:401 nf_register_net_hook+0xae/0x190 net/netfilter/core.c:536 nf_register_net_hooks+0x40/0x1a0 net/netfilter/core.c:552 nf_nat_register_fn+0x3cb/0x580 net/netfilter/nf_nat_core.c:1043 ipt_nat_register_lookups net/ipv4/netfilter/iptable_nat.c:84 [inline] iptable_nat_table_init+0xd0/0x2d0 net/ipv4/netfilter/iptable_nat.c:128 xt_find_table_lock+0x220/0x360 net/netfilter/x_tables.c:1282 xt_request_find_table_lock+0x22/0x100 net/netfilter/x_tables.c:1307 get_info net/ipv4/netfilter/ip_tables.c:964 [inline] do_ipt_get_ctl+0x6df/0x1110 net/ipv4/netfilter/ip_tables.c:1660 nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116 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+0x8f/0x2a0 mm/page_alloc.c:3396 __vunmap+0x8b9/0xa50 mm/vmalloc.c:2628 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:867 [inline] get_entries net/ipv4/netfilter/ip_tables.c:1023 [inline] do_ipt_get_ctl+0xe5e/0x1110 net/ipv4/netfilter/ip_tables.c:1669 nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x1256/0x16a0 net/ipv4/ip_sockglue.c:1797 tcp_getsockopt+0x200/0x25a0 net/ipv4/tcp.c:4322 __sys_getsockopt+0x1b0/0x230 net/socket.c:2256 __do_sys_getsockopt net/socket.c:2271 [inline] __se_sys_getsockopt net/socket.c:2268 [inline] __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2268 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 Memory state around the buggy address: ffff888029f00f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888029f00f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888029f01000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888029f01080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888029f01100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================