================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1326/0x3860 fs/ext4/xattr.c:1729 Read of size 18446744073709551540 at addr ffff88811ac99070 by task syz.1.86/668 CPU: 0 PID: 668 Comm: syz.1.86 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 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+0x249/0x2a0 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x1326/0x3860 fs/ext4/xattr.c:1729 ext4_xattr_block_set+0x93d/0x2a80 fs/ext4/xattr.c:1986 ext4_xattr_set_handle+0xba0/0x12b0 fs/ext4/xattr.c:2389 ext4_xattr_set+0x1f4/0x310 fs/ext4/xattr.c:2499 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+0x1df/0x3f0 fs/xattr.c:548 path_setxattr+0x11f/0x230 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: 0033:0x7fae30d5de59 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:00007fae2f7b8028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007fae30fd6fa0 RCX: 00007fae30d5de59 RDX: 0000200000000100 RSI: 00002000000000c0 RDI: 0000200000000480 RBP: 00007fae30df3d6f R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fae30fd7038 R14: 00007fae30fd6fa0 R15: 00007ffecd658a58 Allocated by task 0: (stack is not available) The buggy address belongs to the object at ffff88811ac99000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 112 bytes inside of 1024-byte region [ffff88811ac99000, ffff88811ac99400) The buggy address belongs to the page: page:ffffea00046b2600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11ac98 head:ffffea00046b2600 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 37255393684, free_ts 37236663420 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+0x223b/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5384 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+0x1ec/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] inet6_rt_notify+0x293/0x480 net/ipv6/route.c:6054 fib6_del_route net/ipv6/ip6_fib.c:1994 [inline] fib6_del+0xc4b/0xfa0 net/ipv6/ip6_fib.c:2029 fib6_clean_node+0x2a4/0x540 net/ipv6/ip6_fib.c:2191 fib6_walk_continue+0x4fc/0x700 net/ipv6/ip6_fib.c:2113 fib6_walk+0x153/0x290 net/ipv6/ip6_fib.c:2161 fib6_clean_tree net/ipv6/ip6_fib.c:2241 [inline] __fib6_clean_all net/ipv6/ip6_fib.c:2257 [inline] fib6_clean_all+0x1b3/0x290 net/ipv6/ip6_fib.c:2268 rt6_sync_down_dev net/ipv6/route.c:4794 [inline] rt6_disable_ip+0x121/0x6b0 net/ipv6/route.c:4799 addrconf_ifdown+0x150/0x1850 net/ipv6/addrconf.c:3788 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+0x80b/0x830 mm/page_alloc.c:1629 free_the_page mm/page_alloc.c:5445 [inline] __free_pages+0xd8/0x3b0 mm/page_alloc.c:5454 __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+0x10e/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_trace+0x15d/0x2e0 mm/slub.c:2977 kmalloc include/linux/slab.h:555 [inline] syslog_print+0x133/0x750 kernel/printk/printk.c:1487 do_syslog+0x94c/0x9a0 kernel/printk/printk.c:1644 __do_sys_syslog kernel/printk/printk.c:1736 [inline] __se_sys_syslog kernel/printk/printk.c:1734 [inline] __x64_sys_syslog+0x7c/0x90 kernel/printk/printk.c:1734 Memory state around the buggy address: ffff88811ac98f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811ac98f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88811ac99000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88811ac99080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811ac99100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================