hfsplus: invalid length 256 has been corrected to 255 ================================================================== BUG: KASAN: slab-out-of-bounds in hfsplus_uni2asc+0x5bd/0x1240 fs/hfsplus/unicode.c:210 Read of size 2 at addr ffff88805fa5d218 by task syz.4.1333/11963 CPU: 0 PID: 11963 Comm: syz.4.1333 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xac/0x220 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 hfsplus_uni2asc+0x5bd/0x1240 fs/hfsplus/unicode.c:210 hfsplus_listxattr+0x58f/0xb80 fs/hfsplus/xattr.c:740 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: 0033:0x7f3d8e58efc9 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:00007f3d8f34b038 EFLAGS: 00000246 ORIG_RAX: 00000000000000c3 RAX: ffffffffffffffda RBX: 00007f3d8e7e6180 RCX: 00007f3d8e58efc9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000080 RBP: 00007f3d8e611f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3d8e7e6218 R14: 00007f3d8e7e6180 R15: 00007ffefc753988 Allocated by task 11963: 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:699 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 kvfree_call_rcu+0xee/0x780 kernel/rcu/tree.c:3452 neigh_periodic_work+0x3f7/0xd70 net/core/neighbour.c:1010 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 ffff88805fa5d000 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 [ffff88805fa5d000, ffff88805fa5d218) The buggy address belongs to the physical page: page:ffffea00017e9600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5fa58 head:ffffea00017e9600 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888017841dc0 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 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 1324, tgid 1324 (kworker/u4:6), ts 64852956538, free_ts 16743243967 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:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2e0 mm/slub.c:2081 ___slab_alloc+0xc6d/0x1300 mm/slub.c:3253 __slab_alloc mm/slub.c:3339 [inline] __slab_alloc_node mm/slub.c:3392 [inline] slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x1a2/0x260 mm/slub.c:3534 __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:1010 [inline] inet6_rt_notify+0xb4/0x240 net/ipv6/route.c:6236 fib6_add_rt2node net/ipv6/ip6_fib.c:1260 [inline] fib6_add+0x1d9a/0x3d20 net/ipv6/ip6_fib.c:1489 __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:2450 [inline] addrconf_add_linklocal+0x45c/0x6b0 net/ipv6/addrconf.c:3286 addrconf_addr_gen+0x4ac/0x5a0 net/ipv6/addrconf.c:3415 addrconf_init_auto_addrs+0x70e/0xaa0 net/ipv6/addrconf.c:-1 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 free_contig_range+0xa1/0x160 mm/page_alloc.c:6369 destroy_args+0x80/0x850 mm/debug_vm_pgtable.c:1015 debug_vm_pgtable+0x3cc/0x410 mm/debug_vm_pgtable.c:1400 do_one_initcall+0x1fd/0x750 init/main.c:1250 do_initcall_level+0x137/0x1f0 init/main.c:1312 do_initcalls+0x69/0xd0 init/main.c:1328 kernel_init_freeable+0x3d2/0x570 init/main.c:1565 kernel_init+0x1d/0x1c0 init/main.c:1455 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Memory state around the buggy address: ffff88805fa5d100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805fa5d180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805fa5d200: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88805fa5d280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805fa5d300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================