================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xfbc/0x15a0 fs/ext4/xattr.c:1687 Read of size 18446744073709550592 at addr ffff0000f4fb8c00 by task syz.4.365/6876 CPU: 1 PID: 6876 Comm: syz.4.365 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 Call trace: dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x258/0x290 mm/kasan/generic.c:189 memmove+0x48/0x90 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0xfbc/0x15a0 fs/ext4/xattr.c:1687 ext4_xattr_block_set+0x640/0x2880 fs/ext4/xattr.c:1977 ext4_xattr_set_handle+0xc68/0x1344 fs/ext4/xattr.c:2399 ext4_xattr_set+0x1f4/0x2c0 fs/ext4/xattr.c:2501 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x384/0x3a0 fs/xattr.c:182 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277 vfs_setxattr+0x158/0x2ac fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x258/0x2d8 fs/xattr.c:617 path_setxattr+0x130/0x260 fs/xattr.c:636 __do_sys_lsetxattr fs/xattr.c:659 [inline] __se_sys_lsetxattr fs/xattr.c:655 [inline] __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:655 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 6876: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node_track_caller+0xe0/0x16c mm/slab_common.c:956 kmemdup+0x5c/0x98 mm/util.c:129 kmemdup include/linux/fortify-string.h:585 [inline] ext4_xattr_block_set+0x574/0x2880 fs/ext4/xattr.c:1925 ext4_xattr_set_handle+0xc68/0x1344 fs/ext4/xattr.c:2399 ext4_xattr_set+0x1f4/0x2c0 fs/ext4/xattr.c:2501 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x384/0x3a0 fs/xattr.c:182 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277 vfs_setxattr+0x158/0x2ac fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x258/0x2d8 fs/xattr.c:617 path_setxattr+0x130/0x260 fs/xattr.c:636 __do_sys_lsetxattr fs/xattr.c:659 [inline] __se_sys_lsetxattr fs/xattr.c:655 [inline] __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:655 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:46 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 kvfree_call_rcu+0xb4/0x6e8 kernel/rcu/tree.c:3405 neigh_destroy+0x458/0x650 net/core/neighbour.c:923 neigh_release include/net/neighbour.h:448 [inline] neigh_cleanup_and_release+0x154/0x3b4 net/core/neighbour.c:104 neigh_periodic_work+0x444/0xab8 net/core/neighbour.c:1010 process_one_work+0x7f8/0x13a4 kernel/workqueue.c:2292 worker_thread+0x8c4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 The buggy address belongs to the object at ffff0000f4fb8800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 0 bytes to the right of 1024-byte region [ffff0000f4fb8800, ffff0000f4fb8c00) The buggy address belongs to the physical page: page:000000002ef65b15 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x134fb8 head:000000002ef65b15 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0002780 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f4fb8b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000f4fb8b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000f4fb8c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000f4fb8c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f4fb8d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================