loop5: detected capacity change from 0 to 1024 ================================================================== BUG: KASAN: slab-out-of-bounds in hfsplus_uni2asc+0x648/0x1054 fs/hfsplus/unicode.c:179 Read of size 2 at addr ffff0000c7bc040c by task syz.5.527/6309 CPU: 0 PID: 6309 Comm: syz.5.527 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x78/0x30c mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xec/0x15c mm/kasan/report.c:451 __asan_report_load2_noabort+0x44/0x50 mm/kasan/report_generic.c:307 hfsplus_uni2asc+0x648/0x1054 fs/hfsplus/unicode.c:179 hfsplus_readdir+0x634/0xb7c fs/hfsplus/dir.c:207 iterate_dir+0x1f0/0x4cc fs/readdir.c:-1 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __arm64_sys_getdents64+0x11c/0x340 fs/readdir.c:354 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Allocated by task 6309: 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 mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb0/0xf0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc+0x298/0x44c mm/slub.c:4407 kmalloc include/linux/slab.h:609 [inline] hfsplus_find_init+0x84/0x1bc fs/hfsplus/bfind.c:21 hfsplus_readdir+0x19c/0xb7c fs/hfsplus/dir.c:144 iterate_dir+0x1f0/0x4cc fs/readdir.c:-1 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __arm64_sys_getdents64+0x11c/0x340 fs/readdir.c:354 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Last potentially related work creation: kasan_save_stack+0x38/0x68 mm/kasan/common.c:38 kasan_record_aux_stack+0xcc/0x114 mm/kasan/generic.c:348 kvfree_call_rcu+0xb8/0x66c kernel/rcu/tree.c:3600 drop_sysctl_table+0x274/0x39c fs/proc/proc_sysctl.c:1685 unregister_sysctl_table+0x94/0x134 fs/proc/proc_sysctl.c:1723 unregister_net_sysctl_table+0x20/0x30 net/sysctl_net.c:175 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7131 [inline] addrconf_sysctl_unregister net/ipv6/addrconf.c:7159 [inline] addrconf_ifdown+0x12fc/0x1688 net/ipv6/addrconf.c:3929 addrconf_notify+0x2f4/0xc6c net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2049 [inline] call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] unregister_netdevice_many+0xe10/0x17d0 net/core/dev.c:11134 ip6gre_exit_batch_net+0x418/0x468 net/ipv6/ip6_gre.c:1650 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x644/0xa98 net/core/net_namespace.c:635 process_one_work+0x79c/0x1140 kernel/workqueue.c:2310 worker_thread+0x8f4/0x101c kernel/workqueue.c:2457 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:855 The buggy address belongs to the object at ffff0000c7bc0000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1036 bytes inside of 2048-byte region [ffff0000c7bc0000, ffff0000c7bc0800) The buggy address belongs to the page: page:000000006dfea72b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107bc0 head:000000006dfea72b order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0002900 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c7bc0300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000c7bc0380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000c7bc0400: 00 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000c7bc0480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000c7bc0500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================