EXT4-fs (loop2): mounted filesystem without journal. Opts: init_itable=0x0000000000000000,jqfmt=vfsold,debug_want_extra_isize=0x000000000000006a,user_xattr,errors=remount-ro,quota,. Quota mode: writeback. ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1384/0x37d0 fs/ext4/xattr.c:1747 Read of size 18446744073709551540 at addr ffff8881167c1870 by task syz.2.16/530 CPU: 0 PID: 530 Comm: syz.2.16 Not tainted 5.15.185-syzkaller-00038-g2160dcc38acf #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106 print_address_description+0x7f/0x2b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xe0/0x130 mm/kasan/report.c:451 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x280/0x290 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x1384/0x37d0 fs/ext4/xattr.c:1747 ext4_xattr_block_set+0x8cd/0x2cb0 fs/ext4/xattr.c:2004 ext4_xattr_set_handle+0xba5/0x12b0 fs/ext4/xattr.c:2412 ext4_xattr_set+0x22a/0x320 fs/ext4/xattr.c:2522 ext4_xattr_trusted_set+0x3c/0x50 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x3e1/0x430 fs/xattr.c:182 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277 vfs_setxattr+0x168/0x2f0 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x2da/0x300 fs/xattr.c:611 path_setxattr+0x142/0x280 fs/xattr.c:630 __do_sys_lsetxattr fs/xattr.c:653 [inline] __se_sys_lsetxattr fs/xattr.c:649 [inline] __x64_sys_lsetxattr+0xc2/0xe0 fs/xattr.c:649 x64_sys_call+0x8cc/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:190 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: 0033:0x7fe6ac2f5929 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:00007fe6abd66038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007fe6ac51cfa0 RCX: 00007fe6ac2f5929 RDX: 0000200000000040 RSI: 0000200000000300 RDI: 0000200000000100 RBP: 00007fe6ac377b39 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fe6ac51cfa0 R15: 00007ffde34d98f8 Allocated by task 530: 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+0xda/0x110 mm/kasan/common.c:513 __kasan_kmalloc+0xd/0x20 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc_track_caller+0x138/0x270 mm/slub.c:4930 kmemdup+0x26/0x60 mm/util.c:128 ext4_xattr_block_set+0x7e2/0x2cb0 fs/ext4/xattr.c:1952 ext4_xattr_set_handle+0xba5/0x12b0 fs/ext4/xattr.c:2412 ext4_xattr_set+0x22a/0x320 fs/ext4/xattr.c:2522 ext4_xattr_trusted_set+0x3c/0x50 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x3e1/0x430 fs/xattr.c:182 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277 vfs_setxattr+0x168/0x2f0 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x2da/0x300 fs/xattr.c:611 path_setxattr+0x142/0x280 fs/xattr.c:630 __do_sys_lsetxattr fs/xattr.c:653 [inline] __se_sys_lsetxattr fs/xattr.c:649 [inline] __x64_sys_lsetxattr+0xc2/0xe0 fs/xattr.c:649 x64_sys_call+0x8cc/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:190 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 ffff8881167c1800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 112 bytes inside of 1024-byte region [ffff8881167c1800, ffff8881167c1c00) The buggy address belongs to the page: page:ffffea000459f000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1167c0 head:ffffea000459f000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100041dc0 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 19, ts 52855328588, free_ts 52818462778 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x132/0x160 mm/page_alloc.c:2420 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x2fda/0x30b0 mm/page_alloc.c:4192 __alloc_pages+0x246/0x4f0 mm/page_alloc.c:5474 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0x98/0x460 mm/slub.c:1975 ___slab_alloc+0x381/0x810 mm/slub.c:3008 __slab_alloc+0x49/0x90 mm/slub.c:3095 slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] __kmalloc_track_caller+0x165/0x270 mm/slub.c:4925 kmalloc_reserve net/core/skbuff.c:356 [inline] __alloc_skb+0x21a/0x740 net/core/skbuff.c:427 alloc_skb include/linux/skbuff.h:1162 [inline] nlmsg_new include/net/netlink.h:953 [inline] inet6_rt_notify+0x287/0x470 net/ipv6/route.c:6181 fib6_add_rt2node net/ipv6/ip6_fib.c:1255 [inline] fib6_add+0x2279/0x3d10 net/ipv6/ip6_fib.c:1484 __ip6_ins_rt net/ipv6/route.c:1305 [inline] ip6_ins_rt+0xc5/0x110 net/ipv6/route.c:1315 __ipv6_ifa_notify+0x4bb/0xd90 net/ipv6/addrconf.c:6191 ipv6_ifa_notify net/ipv6/addrconf.c:6230 [inline] addrconf_dad_completed+0x179/0xe70 net/ipv6/addrconf.c:4242 addrconf_dad_work+0xc6c/0x1530 net/ipv6/addrconf.c:-1 process_one_work+0x6be/0xba0 kernel/workqueue.c:2310 worker_thread+0xa56/0x1200 kernel/workqueue.c:2457 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:1413 [inline] free_unref_page_prepare+0x4f6/0x530 mm/page_alloc.c:3317 free_unref_page+0x7d/0x1c0 mm/page_alloc.c:3396 free_the_page mm/page_alloc.c:705 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5550 __free_slab+0xe8/0x1e0 mm/slub.c:2000 free_slab mm/slub.c:2015 [inline] discard_slab mm/slub.c:2021 [inline] __unfreeze_partials+0x160/0x190 mm/slub.c:2507 put_cpu_partial+0xc6/0x120 mm/slub.c:2587 __slab_free+0x1d4/0x290 mm/slub.c:3368 do_slab_free mm/slub.c:3487 [inline] ___cache_free+0x104/0x120 mm/slub.c:3506 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0xf7/0x210 mm/slub.c:3233 getname_flags+0xb9/0x500 fs/namei.c:138 getname+0x19/0x20 fs/namei.c:217 Memory state around the buggy address: ffff8881167c1700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881167c1780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881167c1800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8881167c1880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881167c1900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================