RDX: 00002000000000c0 RSI: 0000000040305828 RDI: 0000000000000004 RBP: 00007f90769bbab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f9076b61080 R15: 00007ffc4ee953c8 ---[ end trace 4a1cf25bfd3269d0 ]--- ================================================================== BUG: KASAN: slab-out-of-bounds in __set_sit_entry_type fs/f2fs/segment.c:2257 [inline] BUG: KASAN: slab-out-of-bounds in reset_curseg+0x4dd/0x560 fs/f2fs/segment.c:2663 Read of size 4 at addr ffff8881157823c0 by task syz.1.1030/3854 CPU: 0 PID: 3854 Comm: syz.1.1030 Tainted: G W 5.10.236-syzkaller-00012-gab07aeb2c93d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 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 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 __set_sit_entry_type fs/f2fs/segment.c:2257 [inline] reset_curseg+0x4dd/0x560 fs/f2fs/segment.c:2663 new_curseg+0x12f6/0x18a0 fs/f2fs/segment.c:2723 __allocate_new_segment+0x13d/0x810 fs/f2fs/segment.c:3039 __allocate_new_section fs/f2fs/segment.c:3047 [inline] f2fs_allocate_new_section+0x1d5/0x280 fs/f2fs/segment.c:3054 expand_inode_data+0x5a8/0x930 fs/f2fs/file.c:1720 f2fs_fallocate+0x42b/0x7e0 fs/f2fs/file.c:1825 vfs_fallocate+0x4b4/0x590 fs/open.c:310 ioctl_preallocate fs/ioctl.c:494 [inline] file_ioctl fs/ioctl.c:-1 [inline] do_vfs_ioctl+0x12e3/0x1510 fs/ioctl.c:732 __do_sys_ioctl fs/ioctl.c:751 [inline] __se_sys_ioctl+0x9f/0x1a0 fs/ioctl.c:739 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9076939969 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:00007f9074f81038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9076b61080 RCX: 00007f9076939969 RDX: 00002000000000c0 RSI: 0000000040305828 RDI: 0000000000000004 RBP: 00007f90769bbab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f9076b61080 R15: 00007ffc4ee953c8 Allocated by task 3829: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x1a7/0x330 mm/slub.c:4033 __kmalloc_node include/linux/slab.h:418 [inline] kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x88/0x130 mm/util.c:612 kvmalloc include/linux/mm.h:822 [inline] f2fs_kvmalloc fs/f2fs/f2fs.h:3368 [inline] f2fs_kvzalloc fs/f2fs/f2fs.h:3374 [inline] build_sit_info fs/f2fs/segment.c:4395 [inline] f2fs_build_segment_manager+0xdba/0x48f0 fs/f2fs/segment.c:5258 f2fs_fill_super+0x42d1/0x6c70 fs/f2fs/super.c:4268 mount_bdev+0x28b/0x3a0 fs/super.c:1442 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4548 legacy_get_tree+0xed/0x190 fs/fs_context.c:593 vfs_get_tree+0x89/0x260 fs/super.c:1572 do_new_mount+0x25a/0xa20 fs/namespace.c:2917 path_mount+0x572/0xc80 fs/namespace.c:3247 do_mount fs/namespace.c:3260 [inline] __do_sys_mount fs/namespace.c:3468 [inline] __se_sys_mount+0x318/0x380 fs/namespace.c:3445 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3445 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2976 [inline] call_rcu+0x105/0x1040 kernel/rcu/tree.c:3050 qdisc_destroy+0x154/0x250 net/sched/sch_generic.c:1006 qdisc_put net/sched/sch_generic.c:1018 [inline] shutdown_scheduler_queue net/sched/sch_generic.c:1071 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2321 [inline] dev_shutdown+0x198/0x580 net/sched/sch_generic.c:1378 unregister_netdevice_many+0x92d/0x1980 net/core/dev.c:10759 unregister_netdevice_queue+0x31c/0x360 net/core/dev.c:10700 unregister_netdevice include/linux/netdevice.h:2937 [inline] __tun_detach+0xca6/0x1450 drivers/net/tun.c:697 tun_detach drivers/net/tun.c:713 [inline] tun_chr_close+0x92/0x140 drivers/net/tun.c:3486 __fput+0x2fb/0x770 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x127/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0x68/0x90 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2976 [inline] call_rcu+0x105/0x1040 kernel/rcu/tree.c:3050 qdisc_destroy+0x154/0x250 net/sched/sch_generic.c:1006 qdisc_put net/sched/sch_generic.c:1018 [inline] shutdown_scheduler_queue net/sched/sch_generic.c:1071 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2321 [inline] dev_shutdown+0x198/0x580 net/sched/sch_generic.c:1378 unregister_netdevice_many+0x92d/0x1980 net/core/dev.c:10759 unregister_netdevice_queue+0x31c/0x360 net/core/dev.c:10700 unregister_netdevice include/linux/netdevice.h:2937 [inline] __tun_detach+0xca6/0x1450 drivers/net/tun.c:697 tun_detach drivers/net/tun.c:713 [inline] tun_chr_close+0x92/0x140 drivers/net/tun.c:3486 __fput+0x2fb/0x770 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x127/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0x68/0x90 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888115782000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 960 bytes inside of 1024-byte region [ffff888115782000, ffff888115782400) The buggy address belongs to the page: page:ffffea000455e000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x115780 head:ffffea000455e000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042f00 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1940, ts 105732621927, free_ts 105720555765 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+0x2235/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5349 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1808 [inline] new_slab+0x84/0x3f0 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x2a6/0x450 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] __kmalloc_track_caller+0x1ef/0x320 mm/slub.c:4536 __kmalloc_reserve net/core/skbuff.c:144 [inline] __alloc_skb+0xdc/0x520 net/core/skbuff.c:212 alloc_skb_fclone include/linux/skbuff.h:1176 [inline] tipc_buf_acquire net/tipc/msg.c:74 [inline] tipc_msg_build+0xd0/0xc90 net/tipc/msg.c:394 tipc_send_group_bcast+0x721/0xa40 net/tipc/socket.c:1109 __tipc_sendmsg+0xd51/0x2be0 net/tipc/socket.c:-1 tipc_sendmsg+0x55/0x70 net/tipc/socket.c:1391 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2376 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2430 __sys_sendmmsg+0x273/0x450 net/socket.c:2516 __do_sys_sendmmsg net/socket.c:2545 [inline] __se_sys_sendmmsg net/socket.c:2542 [inline] __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2542 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+0x7fc/0x820 mm/page_alloc.c:1629 free_the_page mm/page_alloc.c:5410 [inline] __free_pages+0xdd/0x380 mm/page_alloc.c:5419 __free_slab+0xcf/0x190 mm/slub.c:1894 free_slab mm/slub.c:1909 [inline] discard_slab mm/slub.c:1915 [inline] unfreeze_partials+0x15f/0x190 mm/slub.c:2410 put_cpu_partial+0xc1/0x180 mm/slub.c:2446 __slab_free+0x2c9/0x3a0 mm/slub.c:3095 do_slab_free mm/slub.c:3191 [inline] ___cache_free+0x111/0x130 mm/slub.c:3210 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:583 slab_alloc_node mm/slub.c:2947 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc+0x165/0x2e0 mm/slub.c:2960 kmem_cache_alloc_node include/linux/slab.h:423 [inline] __alloc_skb+0x9e/0x520 net/core/skbuff.c:200 alloc_skb_fclone include/linux/skbuff.h:1176 [inline] tipc_buf_acquire net/tipc/msg.c:74 [inline] tipc_msg_build+0xd0/0xc90 net/tipc/msg.c:394 tipc_send_group_bcast+0x721/0xa40 net/tipc/socket.c:1109 Memory state around the buggy address: ffff888115782280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888115782300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888115782380: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888115782400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888115782480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 3854 Comm: syz.1.1030 Tainted: G B W 5.10.236-syzkaller-00012-gab07aeb2c93d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:update_sit_entry+0x3eb/0xf50 fs/f2fs/segment.c:-1 Code: 89 45 a8 49 01 c5 41 f6 d7 41 80 e7 07 44 89 f9 41 bf 01 00 00 00 41 d3 e7 4d 89 ee 49 c1 ee 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 06 84 c0 0f 85 a5 08 00 00 41 0f b6 5d 00 44 89 f8 41 RSP: 0018:ffffc90000e57350 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8881157823c8 RCX: 0000000000000007 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881157823c8 RBP: ffffc90000e573d0 R08: ffff88811a5ea780 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000004000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000080 FS: 00007f9074f816c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000057eff8 CR3: 000000012a0af000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_allocate_data_block+0x156b/0x3a10 fs/f2fs/segment.c:3481 __allocate_data_block+0x52a/0x980 fs/f2fs/data.c:1407 f2fs_map_blocks+0xdc8/0x35c0 fs/f2fs/data.c:1575 expand_inode_data+0x5d7/0x930 fs/f2fs/file.c:1724 f2fs_fallocate+0x42b/0x7e0 fs/f2fs/file.c:1825 vfs_fallocate+0x4b4/0x590 fs/open.c:310 ioctl_preallocate fs/ioctl.c:494 [inline] file_ioctl fs/ioctl.c:-1 [inline] do_vfs_ioctl+0x12e3/0x1510 fs/ioctl.c:732 __do_sys_ioctl fs/ioctl.c:751 [inline] __se_sys_ioctl+0x9f/0x1a0 fs/ioctl.c:739 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9076939969 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:00007f9074f81038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9076b61080 RCX: 00007f9076939969 RDX: 00002000000000c0 RSI: 0000000040305828 RDI: 0000000000000004 RBP: 00007f90769bbab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f9076b61080 R15: 00007ffc4ee953c8 Modules linked in: ---[ end trace 4a1cf25bfd3269d1 ]--- RIP: 0010:update_sit_entry+0x3eb/0xf50 fs/f2fs/segment.c:-1 Code: 89 45 a8 49 01 c5 41 f6 d7 41 80 e7 07 44 89 f9 41 bf 01 00 00 00 41 d3 e7 4d 89 ee 49 c1 ee 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 06 84 c0 0f 85 a5 08 00 00 41 0f b6 5d 00 44 89 f8 41 RSP: 0018:ffffc90000e57350 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8881157823c8 RCX: 0000000000000007 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881157823c8 RBP: ffffc90000e573d0 R08: ffff88811a5ea780 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000004000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000080 FS: 00007f9074f816c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2cc10ff8 CR3: 000000012a0af000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 45 a8 mov %eax,-0x58(%rbp) 3: 49 01 c5 add %rax,%r13 6: 41 f6 d7 not %r15b 9: 41 80 e7 07 and $0x7,%r15b d: 44 89 f9 mov %r15d,%ecx 10: 41 bf 01 00 00 00 mov $0x1,%r15d 16: 41 d3 e7 shl %cl,%r15d 19: 4d 89 ee mov %r13,%r14 1c: 49 c1 ee 03 shr $0x3,%r14 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 41 0f b6 04 06 movzbl (%r14,%rax,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 a5 08 00 00 jne 0x8dc 37: 41 0f b6 5d 00 movzbl 0x0(%r13),%ebx 3c: 44 89 f8 mov %r15d,%eax 3f: 41 rex.B