================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x94b/0x1e90 fs/ext4/xattr.c:1795 Read of size 18446744073709551588 at addr ffff88802bd4c840 by task syz.6.1477/12970 CPU: 0 PID: 12970 Comm: syz.6.1477 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 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:1795 ext4_xattr_block_set+0xae3/0x32a0 fs/ext4/xattr.c:2042 ext4_xattr_set_handle+0x10a1/0x1290 fs/ext4/xattr.c:2467 ext4_xattr_set+0x22d/0x320 fs/ext4/xattr.c:2569 __vfs_setxattr+0x431/0x470 fs/xattr.c:201 __vfs_setxattr_noperm+0x12d/0x5e0 fs/xattr.c:235 vfs_setxattr+0x16c/0x2f0 fs/xattr.c:322 do_setxattr fs/xattr.c:630 [inline] path_setxattr+0x362/0x550 fs/xattr.c:659 __do_sys_lsetxattr fs/xattr.c:684 [inline] __se_sys_lsetxattr fs/xattr.c:680 [inline] __x64_sys_lsetxattr+0xb8/0xd0 fs/xattr.c:680 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: 0033:0x7f605bd8f749 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:00007f605cbc1038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007f605bfe6090 RCX: 00007f605bd8f749 RDX: 0000200000000000 RSI: 0000200000000180 RDI: 0000200000000080 RBP: 00007f605be13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000361 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f605bfe6128 R14: 00007f605bfe6090 R15: 00007ffc2de52ac8 Allocated by task 12970: 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:1990 ext4_xattr_set_handle+0x10a1/0x1290 fs/ext4/xattr.c:2467 ext4_xattr_set+0x22d/0x320 fs/ext4/xattr.c:2569 __vfs_setxattr+0x431/0x470 fs/xattr.c:201 __vfs_setxattr_noperm+0x12d/0x5e0 fs/xattr.c:235 vfs_setxattr+0x16c/0x2f0 fs/xattr.c:322 do_setxattr fs/xattr.c:630 [inline] path_setxattr+0x362/0x550 fs/xattr.c:659 __do_sys_lsetxattr fs/xattr.c:684 [inline] __se_sys_lsetxattr fs/xattr.c:680 [inline] __x64_sys_lsetxattr+0xb8/0xd0 fs/xattr.c:680 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 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492 kvfree_call_rcu+0xee/0x780 kernel/rcu/tree.c:3452 neigh_flush_dev+0x177/0xa80 net/core/neighbour.c:430 neigh_changeaddr+0x30/0x40 net/core/neighbour.c:438 ndisc_netdev_event+0x18f/0x4d0 net/ipv6/ndisc.c:1883 notifier_call_chain+0x197/0x390 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2064 [inline] call_netdevice_notifiers net/core/dev.c:2078 [inline] dev_set_mac_address+0x377/0x4b0 net/core/dev.c:8948 dev_set_mac_address_user+0x31/0x50 net/core/dev.c:8962 do_setlink+0x871/0x3fb0 net/core/rtnetlink.c:2860 __rtnl_newlink net/core/rtnetlink.c:3703 [inline] rtnl_newlink+0x175b/0x2020 net/core/rtnetlink.c:3750 rtnetlink_rcv_msg+0x7c7/0xf10 net/core/rtnetlink.c:6472 netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x46a/0x620 net/socket.c:2201 __do_sys_sendto net/socket.c:2213 [inline] __se_sys_sendto net/socket.c:2209 [inline] __x64_sys_sendto+0xde/0xf0 net/socket.c:2209 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 ffff88802bd4c800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 64 bytes inside of 1024-byte region [ffff88802bd4c800, ffff88802bd4cc00) The buggy address belongs to the physical page: page:ffffea0000af5200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2bd48 head:ffffea0000af5200 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 dead000000000100 dead000000000122 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5801, tgid 5801 (syz-executor), ts 72508107221, free_ts 63353700874 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:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2e0 mm/slub.c:2081 ___slab_alloc+0xc6d/0x1300 mm/slub.c:3253 __slab_alloc mm/slub.c:3339 [inline] __slab_alloc_node mm/slub.c:3392 [inline] slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x1a2/0x260 mm/slub.c:3534 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] rxrpc_alloc_connection+0x7b/0x550 net/rxrpc/conn_object.c:62 rxrpc_prealloc_service_connection+0x26/0x2e0 net/rxrpc/conn_service.c:123 rxrpc_service_prealloc_one+0x2d6/0xd40 net/rxrpc/call_accept.c:87 rxrpc_kernel_charge_accept+0xd4/0x100 net/rxrpc/call_accept.c:480 afs_charge_preallocation+0x3a4/0x4f0 fs/afs/rxrpc.c:743 afs_open_socket+0x29c/0x330 fs/afs/rxrpc.c:94 afs_net_init+0x7bc/0x9a0 fs/afs/main.c:126 ops_init+0x397/0x640 net/core/net_namespace.c:139 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 discard_slab mm/slub.c:2127 [inline] __unfreeze_partials+0x1cf/0x210 mm/slub.c:2667 put_cpu_partial+0x17c/0x250 mm/slub.c:2743 __slab_free+0x31d/0x410 mm/slub.c:3700 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:3495 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3519 vm_area_alloc+0x24/0x1d0 kernel/fork.c:486 __mmap_region mm/mmap.c:2770 [inline] mmap_region+0xc8a/0x2020 mm/mmap.c:2941 do_mmap+0x92f/0x10a0 mm/mmap.c:1385 vm_mmap_pgoff+0x1c0/0x400 mm/util.c:556 ksys_mmap_pgoff+0x520/0x700 mm/mmap.c:1431 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 Memory state around the buggy address: ffff88802bd4c700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802bd4c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802bd4c800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88802bd4c880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802bd4c900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================