================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1339/0x36c0 fs/ext4/xattr.c:1741 Read of size 18446744073709551540 at addr ffff8881179fd870 by task syz.2.17/500 CPU: 0 PID: 500 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 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+0x1339/0x36c0 fs/ext4/xattr.c:1741 ext4_xattr_block_set+0x92f/0x2a50 fs/ext4/xattr.c:1998 ext4_xattr_set_handle+0xba5/0x12a0 fs/ext4/xattr.c:2404 ext4_xattr_set+0x1ec/0x320 fs/ext4/xattr.c:2514 ext4_xattr_trusted_set+0x3b/0x50 fs/ext4/xattr_trusted.c:37 __vfs_setxattr+0x42a/0x480 fs/xattr.c:177 __vfs_setxattr_noperm+0x11e/0x4e0 fs/xattr.c:208 __vfs_setxattr_locked+0x203/0x220 fs/xattr.c:266 vfs_setxattr+0x8d/0x1c0 fs/xattr.c:283 setxattr+0x1a9/0x370 fs/xattr.c:548 path_setxattr+0x110/0x210 fs/xattr.c:567 __do_sys_lsetxattr fs/xattr.c:589 [inline] __se_sys_lsetxattr fs/xattr.c:585 [inline] __x64_sys_lsetxattr+0xc2/0xe0 fs/xattr.c:585 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f870d95dbe9 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:00007f870d7ce038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007f870db94fa0 RCX: 00007f870d95dbe9 RDX: 0000200000000040 RSI: 0000200000000300 RDI: 0000200000000100 RBP: 00007f870d9e0e19 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f870db95038 R14: 00007f870db94fa0 R15: 00007ffc42c7aac8 Allocated by task 0: (stack is not available) The buggy address belongs to the object at ffff8881179fd800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 112 bytes inside of 1024-byte region [ffff8881179fd800, ffff8881179fdc00) The buggy address belongs to the page: page:ffffea00045e7e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1179f8 head:ffffea00045e7e00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042f00 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 49, ts 46173868459, free_ts 46136074066 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5370 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2a6/0x450 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] __kmalloc_track_caller+0x1ef/0x320 mm/slub.c:4541 __kmalloc_reserve net/core/skbuff.c:144 [inline] __alloc_skb+0xdc/0x520 net/core/skbuff.c:212 alloc_skb include/linux/skbuff.h:1126 [inline] nlmsg_new include/net/netlink.h:953 [inline] __neigh_notify+0x83/0x130 net/core/neighbour.c:3379 neigh_cleanup_and_release+0x2c/0x1a0 net/core/neighbour.c:102 neigh_flush_dev+0x642/0x820 net/core/neighbour.c:375 __neigh_ifdown+0x3f/0x380 net/core/neighbour.c:392 neigh_ifdown+0x1f/0x30 net/core/neighbour.c:409 rt6_disable_ip+0x616/0x6a0 net/ipv6/route.c:4802 addrconf_ifdown+0x144/0x1800 net/ipv6/addrconf.c:3788 addrconf_notify+0x3bd/0xe90 net/ipv6/addrconf.c:-1 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x7fc/0x820 mm/page_alloc.c:1629 free_the_page mm/page_alloc.c:5431 [inline] __free_pages+0xdd/0x380 mm/page_alloc.c:5440 __free_slab+0xcf/0x190 mm/slub.c:1899 free_slab mm/slub.c:1914 [inline] discard_slab mm/slub.c:1920 [inline] unfreeze_partials+0x15f/0x190 mm/slub.c:2415 put_cpu_partial+0xc1/0x180 mm/slub.c:2451 __slab_free+0x2c9/0x3a0 mm/slub.c:3100 do_slab_free mm/slub.c:3196 [inline] ___cache_free+0x111/0x130 mm/slub.c:3215 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:440 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580 slab_alloc_node mm/slub.c:2952 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc+0x165/0x2e0 mm/slub.c:2965 kmem_cache_alloc_node include/linux/slab.h:426 [inline] __alloc_skb+0x9e/0x520 net/core/skbuff.c:200 alloc_skb include/linux/skbuff.h:1126 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1178 [inline] netlink_sendmsg+0x5f6/0xb30 net/netlink/af_netlink.c:1889 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2376 Memory state around the buggy address: ffff8881179fd700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881179fd780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881179fd800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8881179fd880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881179fd900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================