loop5: detected capacity change from 0 to 1024 ================================================================== BUG: KASAN: slab-out-of-bounds in hfsplus_uni2asc+0x595/0x1210 fs/hfsplus/unicode.c:179 Read of size 2 at addr ffff888030125218 by task syz.5.1011/10241 CPU: 0 PID: 10241 Comm: syz.5.1011 Not tainted 6.6.99-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xac/0x200 mm/kasan/report.c:466 kasan_report+0x117/0x150 mm/kasan/report.c:579 hfsplus_uni2asc+0x595/0x1210 fs/hfsplus/unicode.c:179 hfsplus_listxattr+0x58f/0xb80 fs/hfsplus/xattr.c:736 vfs_listxattr fs/xattr.c:494 [inline] listxattr+0x107/0x280 fs/xattr.c:842 path_listxattr+0xdd/0x1b0 fs/xattr.c:866 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: 0033:0x7fd244d8e9a9 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:00007fd245bd7038 EFLAGS: 00000246 ORIG_RAX: 00000000000000c3 RAX: ffffffffffffffda RBX: 00007fd244fb5fa0 RCX: 00007fd244d8e9a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000000 RBP: 00007fd244e10d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd244fb5fa0 R15: 00007ffea8b4a578 Allocated by task 10241: 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+0xb4/0x240 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] hfsplus_find_init+0x89/0x1d0 fs/hfsplus/bfind.c:21 hfsplus_listxattr+0x390/0xb80 fs/hfsplus/xattr.c:695 vfs_listxattr fs/xattr.c:494 [inline] listxattr+0x107/0x280 fs/xattr.c:842 path_listxattr+0xdd/0x1b0 fs/xattr.c:866 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 __call_rcu_common kernel/rcu/tree.c:2721 [inline] call_rcu+0x158/0x930 kernel/rcu/tree.c:2837 qdisc_put net/sched/sch_generic.c:1104 [inline] dev_shutdown+0x34f/0x440 net/sched/sch_generic.c:1492 unregister_netdevice_many_notify+0x8d2/0x1810 net/core/dev.c:11064 ip_tunnel_delete_nets+0x31c/0x360 net/ipv4/ip_tunnel.c:1171 ops_exit_list net/core/net_namespace.c:178 [inline] cleanup_net+0x77f/0xb90 net/core/net_namespace.c:652 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 The buggy address belongs to the object at ffff888030125000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 0 bytes to the right of allocated 536-byte region [ffff888030125000, ffff888030125218) The buggy address belongs to the physical page: page:ffffea0000c04800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888030127800 pfn:0x30120 head:ffffea0000c04800 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 ffffea0001e04800 dead000000000002 raw: ffff888030127800 000000008010000f 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5788, tgid 5788 (syz-executor), ts 80213444160, free_ts 80177290147 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:1876 allocate_slab mm/slub.c:2023 [inline] new_slab+0x87/0x2e0 mm/slub.c:2076 ___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230 __slab_alloc mm/slub.c:3329 [inline] __slab_alloc_node mm/slub.c:3382 [inline] slab_alloc_node mm/slub.c:3475 [inline] __kmem_cache_alloc_node+0x1a2/0x260 mm/slub.c:3524 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node_track_caller+0xa2/0x230 mm/slab_common.c:1027 kmalloc_reserve+0x117/0x260 net/core/skbuff.c:581 __alloc_skb+0x138/0x2c0 net/core/skbuff.c:650 alloc_skb include/linux/skbuff.h:1284 [inline] nlmsg_new include/net/netlink.h:999 [inline] inet6_rt_notify+0xb4/0x240 net/ipv6/route.c:6228 fib6_add_rt2node net/ipv6/ip6_fib.c:1255 [inline] fib6_add+0x1d9a/0x3d20 net/ipv6/ip6_fib.c:1484 __ip6_ins_rt net/ipv6/route.c:1343 [inline] ip6_route_add+0x8a/0x130 net/ipv6/route.c:3893 addrconf_prefix_route net/ipv6/addrconf.c:2451 [inline] fixup_permanent_addr net/ipv6/addrconf.c:3571 [inline] addrconf_permanent_addr+0x659/0x980 net/ipv6/addrconf.c:3595 addrconf_notify+0x996/0x1010 net/ipv6/addrconf.c:3667 notifier_call_chain+0x197/0x390 kernel/notifier.c:93 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:2122 [inline] __unfreeze_partials+0x1cf/0x210 mm/slub.c:2662 put_cpu_partial+0x17c/0x250 mm/slub.c:2738 __slab_free+0x31d/0x410 mm/slub.c:3686 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:3485 [inline] kmem_cache_alloc_node+0x150/0x330 mm/slub.c:3530 __alloc_skb+0x108/0x2c0 net/core/skbuff.c:640 alloc_skb include/linux/skbuff.h:1284 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1194 [inline] netlink_sendmsg+0x65b/0xbe0 net/netlink/af_netlink.c:1879 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 Memory state around the buggy address: ffff888030125100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888030125180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888030125200: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888030125280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888030125300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================