================================================================== BUG: KASAN: slab-out-of-bounds in memcpy_from_page include/linux/highmem.h:423 [inline] BUG: KASAN: slab-out-of-bounds in hfs_bnode_read fs/hfs/bnode.c:35 [inline] BUG: KASAN: slab-out-of-bounds in hfs_bnode_read_key+0x314/0x450 fs/hfs/bnode.c:70 Write of size 94 at addr ffff888032d5db80 by task syz.6.298/8653 CPU: 0 UID: 0 PID: 8653 Comm: syz.6.298 Not tainted 6.14.0-rc1-syzkaller-00187-g8f6629c004b1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 memcpy_from_page include/linux/highmem.h:423 [inline] hfs_bnode_read fs/hfs/bnode.c:35 [inline] hfs_bnode_read_key+0x314/0x450 fs/hfs/bnode.c:70 hfs_brec_insert+0x7f3/0xbd0 fs/hfs/brec.c:159 hfs_cat_create+0x41d/0xa50 fs/hfs/catalog.c:118 hfs_create+0x66/0xe0 fs/hfs/dir.c:202 vfs_create+0x23c/0x3d0 fs/namei.c:3350 do_mknodat+0x447/0x5b0 fs/namei.c:4241 __do_sys_mknodat fs/namei.c:4269 [inline] __se_sys_mknodat fs/namei.c:4266 [inline] __x64_sys_mknodat+0xa7/0xc0 fs/namei.c:4266 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8e8f38cde9 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:00007f8e9014c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000103 RAX: ffffffffffffffda RBX: 00007f8e8f5a6080 RCX: 00007f8e8f38cde9 RDX: 0000000000000000 RSI: 0000400000001600 RDI: 0000000000000006 RBP: 00007f8e8f40e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000070c R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8e8f5a6080 R15: 00007ffd123aa758 Allocated by task 8653: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4294 [inline] __kmalloc_noprof+0x285/0x4c0 mm/slub.c:4306 kmalloc_noprof include/linux/slab.h:905 [inline] hfs_find_init+0x90/0x1f0 fs/hfs/bfind.c:21 hfs_cat_create+0x182/0xa50 fs/hfs/catalog.c:96 hfs_create+0x66/0xe0 fs/hfs/dir.c:202 vfs_create+0x23c/0x3d0 fs/namei.c:3350 do_mknodat+0x447/0x5b0 fs/namei.c:4241 __do_sys_mknodat fs/namei.c:4269 [inline] __se_sys_mknodat fs/namei.c:4266 [inline] __x64_sys_mknodat+0xa7/0xc0 fs/namei.c:4266 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888032d5db80 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of allocated 78-byte region [ffff888032d5db80, ffff888032d5dbce) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32d5d flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801ac41280 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 60, tgid 60 (kworker/u8:4), ts 75768722527, free_ts 75758531398 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x3651/0x37a0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2587 new_slab mm/slub.c:2640 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826 __slab_alloc+0x58/0xa0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] __kmalloc_cache_noprof+0x27b/0x390 mm/slub.c:4320 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:990 [inline] nsim_fib_event_nb+0x17c/0x10b0 drivers/net/netdevsim/fib.c:1043 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 atomic_notifier_call_chain+0xdb/0x180 kernel/notifier.c:223 call_fib_notifiers+0x31/0x60 net/core/fib_notifier.c:35 call_fib6_entry_notifiers net/ipv6/ip6_fib.c:397 [inline] fib6_add_rt2node net/ipv6/ip6_fib.c:1231 [inline] fib6_add+0x1bd5/0x4420 net/ipv6/ip6_fib.c:1488 __ip6_ins_rt net/ipv6/route.c:1317 [inline] ip6_ins_rt+0x106/0x170 net/ipv6/route.c:1327 __ipv6_ifa_notify+0x557/0x1160 net/ipv6/addrconf.c:6262 ipv6_ifa_notify net/ipv6/addrconf.c:6301 [inline] addrconf_dad_completed+0x181/0xcd0 net/ipv6/addrconf.c:4316 page last free pid 9 tgid 9 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe04/0x10e0 mm/page_alloc.c:2660 vfree+0x1c3/0x360 mm/vmalloc.c:3383 delayed_vfree_work+0x56/0x80 mm/vmalloc.c:3303 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff888032d5da80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff888032d5db00: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc >ffff888032d5db80: 00 00 00 00 00 00 00 00 00 06 fc fc fc fc fc fc ^ ffff888032d5dc00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888032d5dc80: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ==================================================================