==================================================================
BUG: KASAN: use-after-free in bq_enqueue kernel/bpf/cpumap.c:749 [inline]
BUG: KASAN: use-after-free in cpu_map_enqueue+0xb4/0x370 kernel/bpf/cpumap.c:775
Read of size 8 at addr ffff88811497f008 by task syz.4.379/1241

CPU: 1 PID: 1241 Comm: syz.4.379 Not tainted 6.1.112-syzkaller-00110-g976b055754d7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x158/0x4e0 mm/kasan/report.c:427
 kasan_report+0x13c/0x170 mm/kasan/report.c:531
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:351
 bq_enqueue kernel/bpf/cpumap.c:749 [inline]
 cpu_map_enqueue+0xb4/0x370 kernel/bpf/cpumap.c:775
 __xdp_do_redirect_frame net/core/filter.c:4298 [inline]
 xdp_do_redirect+0x5b0/0xc60 net/core/filter.c:4342
 tun_xdp_act+0xdb/0xc00 drivers/net/tun.c:1625
 tun_build_skb drivers/net/tun.c:1715 [inline]
 tun_get_user+0xb35/0x3a90 drivers/net/tun.c:1818
 tun_chr_write_iter+0x129/0x210 drivers/net/tun.c:2044
 call_write_iter include/linux/fs.h:2274 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0xaf6/0xed0 fs/read_write.c:584
 ksys_write+0x199/0x2c0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:646
 x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f81bb57d1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48
RSP: 002b:00007f81bc329000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f81bb735f80 RCX: 00007f81bb57d1ff
RDX: 0000000000000066 RSI: 0000000020001580 RDI: 00000000000000c8
RBP: 00007f81bb5f139e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000066 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f81bb735f80 R15: 00007ffe64f4ba78
 </TASK>

Allocated by task 1141:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:379 [inline]
 __kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:388
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc_node+0xb4/0x1e0 mm/slab_common.c:945
 kmalloc_node include/linux/slab.h:583 [inline]
 bpf_map_kmalloc_node+0xd0/0x2c0 kernel/bpf/syscall.c:454
 __cpu_map_entry_alloc kernel/bpf/cpumap.c:445 [inline]
 cpu_map_update_elem+0x28f/0xf50 kernel/bpf/cpumap.c:603
 bpf_map_update_value+0x1a3/0x410 kernel/bpf/syscall.c:190
 map_update_elem+0x500/0x680 kernel/bpf/syscall.c:1443
 __sys_bpf+0x460/0x7f0 kernel/bpf/syscall.c:4990
 __do_sys_bpf kernel/bpf/syscall.c:5106 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5104 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5104
 x64_sys_call+0x87f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 1146:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x131/0x180 mm/kasan/common.c:241
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:249
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1745 [inline]
 slab_free_freelist_hook mm/slub.c:1771 [inline]
 slab_free mm/slub.c:3684 [inline]
 __kmem_cache_free+0x218/0x3b0 mm/slub.c:3697
 kfree+0x7a/0xf0 mm/slab_common.c:990
 put_cpu_map_entry+0x6e2/0x760 kernel/bpf/cpumap.c:161
 cpu_map_kthread_run+0x2463/0x2520 kernel/bpf/cpumap.c:408
 kthread+0x26d/0x300 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb4/0xc0 mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
 insert_work+0x56/0x310 kernel/workqueue.c:1368
 __queue_work+0x9b6/0xd70 kernel/workqueue.c:1527
 queue_work_on+0x105/0x170 kernel/workqueue.c:1555
 queue_work include/linux/workqueue.h:510 [inline]
 schedule_work include/linux/workqueue.h:571 [inline]
 __cpu_map_entry_replace kernel/bpf/cpumap.c:558 [inline]
 cpu_map_free+0x1e7/0x2c0 kernel/bpf/cpumap.c:641
 bpf_map_free_deferred+0xf7/0x1b0 kernel/bpf/syscall.c:637
 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299
 worker_thread+0xa60/0x1260 kernel/workqueue.c:2446
 kthread+0x26d/0x300 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Second to last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb4/0xc0 mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
 __call_rcu_common kernel/rcu/tree.c:2807 [inline]
 call_rcu+0xdc/0x10f0 kernel/rcu/tree.c:2926
 __cpu_map_entry_replace kernel/bpf/cpumap.c:556 [inline]
 cpu_map_free+0x109/0x2c0 kernel/bpf/cpumap.c:641
 bpf_map_free_deferred+0xf7/0x1b0 kernel/bpf/syscall.c:637
 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299
 worker_thread+0xa60/0x1260 kernel/workqueue.c:2446
 kthread+0x26d/0x300 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff88811497f000
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 8 bytes inside of
 192-byte region [ffff88811497f000, ffff88811497f0c0)

The buggy address belongs to the physical page:
page:ffffea0004525fc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11497f
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004bbdf80 dead000000000007 ffff888100042c00
raw: 0000000000000000 0000000000100010 00000001ffffffff 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 114, tgid 114 (udevd), ts 5331953158, free_ts 5331895296
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2597
 get_page_from_freelist+0x2980/0x2a10 mm/page_alloc.c:4439
 __alloc_pages+0x234/0x610 mm/page_alloc.c:5728
 alloc_slab_page+0x6c/0xf0
 allocate_slab mm/slub.c:1962 [inline]
 new_slab+0x90/0x3e0 mm/slub.c:2015
 ___slab_alloc+0x6f9/0xb80 mm/slub.c:3203
 __slab_alloc+0x5d/0xa0 mm/slub.c:3302
 slab_alloc_node mm/slub.c:3387 [inline]
 __kmem_cache_alloc_node+0x1af/0x250 mm/slub.c:3460
 kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1028
 kmalloc include/linux/slab.h:557 [inline]
 kzalloc include/linux/slab.h:693 [inline]
 kernfs_fop_open+0x350/0xb10 fs/kernfs/file.c:672
 do_dentry_open+0x891/0x1250 fs/open.c:884
 vfs_open+0x73/0x80 fs/open.c:1015
 do_open fs/namei.c:3627 [inline]
 path_openat+0x2532/0x2d60 fs/namei.c:3784
 do_filp_open+0x230/0x480 fs/namei.c:3811
 do_sys_openat2+0x151/0x870 fs/open.c:1341
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1498 [inline]
 free_pcp_prepare mm/page_alloc.c:1572 [inline]
 free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3511
 free_unref_page+0xb2/0x5c0 mm/page_alloc.c:3607
 free_the_page mm/page_alloc.c:798 [inline]
 __free_pages+0x61/0xf0 mm/page_alloc.c:5817
 free_pages+0x7c/0x90 mm/page_alloc.c:5828
 selinux_genfs_get_sid+0x24d/0x2a0 security/selinux/hooks.c:1303
 inode_doinit_with_dentry+0x8d2/0x1070 security/selinux/hooks.c:1498
 selinux_d_instantiate+0x27/0x40 security/selinux/hooks.c:6390
 security_d_instantiate+0x9f/0x100 security/security.c:2096
 d_splice_alias+0x6d/0x390 fs/dcache.c:3153
 kernfs_iop_lookup+0x29e/0x2f0 fs/kernfs/dir.c:1204
 __lookup_slow+0x2b9/0x3e0 fs/namei.c:1689
 lookup_slow+0x5a/0x80 fs/namei.c:1706
 walk_component+0x2e7/0x410 fs/namei.c:1997
 lookup_last fs/namei.c:2454 [inline]
 path_lookupat+0x16d/0x450 fs/namei.c:2478
 filename_lookup+0x251/0x600 fs/namei.c:2507
 vfs_statx+0x107/0x4b0 fs/stat.c:229

Memory state around the buggy address:
 ffff88811497ef00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88811497ef80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88811497f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff88811497f080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88811497f100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
general protection fault, probably for non-canonical address 0xe09b6d4f9ede009a: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0x04db8a7cf6f004d0-0x04db8a7cf6f004d7]
CPU: 1 PID: 1241 Comm: syz.4.379 Tainted: G    B              6.1.112-syzkaller-00110-g976b055754d7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:bq_enqueue kernel/bpf/cpumap.c:751 [inline]
RIP: 0010:cpu_map_enqueue+0x113/0x370 kernel/bpf/cpumap.c:775
Code: e8 03 42 80 3c 30 00 74 08 48 89 df e8 b6 e1 24 00 4c 8b 23 4f 8d 74 3c 58 4d 89 f5 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 44 05 00 84 c0 0f 85 a8 01 00 00 4d 01 fc 41 8b 1e bf 08
RSP: 0018:ffffc90000b5f7a8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffffff86748898 RCX: 0000000000040000
RDX: ffffc90001f10000 RSI: 0000000000031124 RDI: 0000000000031125
RBP: ffffc90000b5f7e0 R08: ffffffff81982bee R09: fffffbfff0f6defd
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6f00000
R13: 009b714f9ede009a R14: 04db8a7cf6f004d2 R15: 04dc01fb0000047a
FS:  00007f81bc3296c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f81bc328f98 CR3: 000000012db8a000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __xdp_do_redirect_frame net/core/filter.c:4298 [inline]
 xdp_do_redirect+0x5b0/0xc60 net/core/filter.c:4342
 tun_xdp_act+0xdb/0xc00 drivers/net/tun.c:1625
 tun_build_skb drivers/net/tun.c:1715 [inline]
 tun_get_user+0xb35/0x3a90 drivers/net/tun.c:1818
 tun_chr_write_iter+0x129/0x210 drivers/net/tun.c:2044
 call_write_iter include/linux/fs.h:2274 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0xaf6/0xed0 fs/read_write.c:584
 ksys_write+0x199/0x2c0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:646
 x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f81bb57d1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48
RSP: 002b:00007f81bc329000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f81bb735f80 RCX: 00007f81bb57d1ff
RDX: 0000000000000066 RSI: 0000000020001580 RDI: 00000000000000c8
RBP: 00007f81bb5f139e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000066 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f81bb735f80 R15: 00007ffe64f4ba78
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bq_enqueue kernel/bpf/cpumap.c:751 [inline]
RIP: 0010:cpu_map_enqueue+0x113/0x370 kernel/bpf/cpumap.c:775
Code: e8 03 42 80 3c 30 00 74 08 48 89 df e8 b6 e1 24 00 4c 8b 23 4f 8d 74 3c 58 4d 89 f5 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 44 05 00 84 c0 0f 85 a8 01 00 00 4d 01 fc 41 8b 1e bf 08
RSP: 0018:ffffc90000b5f7a8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffffff86748898 RCX: 0000000000040000
RDX: ffffc90001f10000 RSI: 0000000000031124 RDI: 0000000000031125
RBP: ffffc90000b5f7e0 R08: ffffffff81982bee R09: fffffbfff0f6defd
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6f00000
R13: 009b714f9ede009a R14: 04db8a7cf6f004d2 R15: 04dc01fb0000047a
FS:  00007f81bc3296c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f81bc328f98 CR3: 000000012db8a000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e8 03 42 80 3c       	call   0x3c804208
   5:	30 00                	xor    %al,(%rax)
   7:	74 08                	je     0x11
   9:	48 89 df             	mov    %rbx,%rdi
   c:	e8 b6 e1 24 00       	call   0x24e1c7
  11:	4c 8b 23             	mov    (%rbx),%r12
  14:	4f 8d 74 3c 58       	lea    0x58(%r12,%r15,1),%r14
  19:	4d 89 f5             	mov    %r14,%r13
  1c:	49 c1 ed 03          	shr    $0x3,%r13
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	41 0f b6 44 05 00    	movzbl 0x0(%r13,%rax,1),%eax <-- trapping instruction
  30:	84 c0                	test   %al,%al
  32:	0f 85 a8 01 00 00    	jne    0x1e0
  38:	4d 01 fc             	add    %r15,%r12
  3b:	41 8b 1e             	mov    (%r14),%ebx
  3e:	bf                   	.byte 0xbf
  3f:	08                   	.byte 0x8