==================================================================
BUG: KASAN: use-after-free in dev_map_enqueue+0x40/0x340 kernel/bpf/devmap.c:532
Read of size 8 at addr ffff88811a306e80 by task syz.2.298/1455

CPU: 0 PID: 1455 Comm: syz.2.298 Tainted: G        W          6.1.129-syzkaller-00055-gca24c52e3c25 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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
 dev_map_enqueue+0x40/0x340 kernel/bpf/devmap.c:532
 __xdp_do_redirect_frame net/core/filter.c:4319 [inline]
 xdp_do_redirect_frame+0x2b5/0x800 net/core/filter.c:4381
 xdp_test_run_batch net/bpf/test_run.c:314 [inline]
 bpf_test_run_xdp_live+0xc30/0x1f70 net/bpf/test_run.c:362
 bpf_prog_test_run_xdp+0x7d1/0x1130 net/bpf/test_run.c:1393
 bpf_prog_test_run+0x3b0/0x630 kernel/bpf/syscall.c:3670
 __sys_bpf+0x59f/0x7f0 kernel/bpf/syscall.c:5025
 __do_sys_bpf kernel/bpf/syscall.c:5111 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5109 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5109
 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
RIP: 0033:0x7f1bf5b8d169
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:00007f1bf6978038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f1bf5da5fa0 RCX: 00007f1bf5b8d169
RDX: 0000000000000050 RSI: 00002000000000c0 RDI: 000000000000000a
RBP: 00007f1bf5c0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1bf5da5fa0 R15: 00007ffdf7be5af8
 </TASK>

Allocated by task 1294:
 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_krealloc+0x119/0x160 mm/kasan/common.c:447
 kasan_krealloc include/linux/kasan.h:232 [inline]
 __do_krealloc mm/slab_common.c:1338 [inline]
 krealloc+0xc3/0x110 mm/slab_common.c:1375
 push_jmp_history kernel/bpf/verifier.c:2462 [inline]
 is_state_visited kernel/bpf/verifier.c:12311 [inline]
 do_check+0x2728/0xe040 kernel/bpf/verifier.c:12451
 do_check_common+0x6ca/0xca0 kernel/bpf/verifier.c:14930
 do_check_main kernel/bpf/verifier.c:14993 [inline]
 bpf_check+0x6d12/0x17ed0 kernel/bpf/verifier.c:15570
 bpf_prog_load+0x1304/0x1bf0 kernel/bpf/syscall.c:2626
 __sys_bpf+0x52c/0x7f0 kernel/bpf/syscall.c:5007
 __do_sys_bpf kernel/bpf/syscall.c:5111 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5109 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5109
 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 1294:
 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:3686 [inline]
 __kmem_cache_free+0x21d/0x410 mm/slub.c:3702
 kfree+0x7a/0xf0 mm/slab_common.c:990
 krealloc+0xd8/0x110 mm/slab_common.c:-1
 push_jmp_history kernel/bpf/verifier.c:2462 [inline]
 is_state_visited kernel/bpf/verifier.c:12311 [inline]
 do_check+0x2728/0xe040 kernel/bpf/verifier.c:12451
 do_check_common+0x6ca/0xca0 kernel/bpf/verifier.c:14930
 do_check_main kernel/bpf/verifier.c:14993 [inline]
 bpf_check+0x6d12/0x17ed0 kernel/bpf/verifier.c:15570
 bpf_prog_load+0x1304/0x1bf0 kernel/bpf/syscall.c:2626
 __sys_bpf+0x52c/0x7f0 kernel/bpf/syscall.c:5007
 __do_sys_bpf kernel/bpf/syscall.c:5111 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5109 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5109
 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

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
 kvfree_call_rcu+0x9f/0x800 kernel/rcu/tree.c:3445
 kernfs_unlink_open_file+0x327/0x3d0 fs/kernfs/file.c:635
 kernfs_fop_release+0x253/0x310 fs/kernfs/file.c:807
 __fput+0x1e5/0x870 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x24d/0x2e0 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x94/0xa0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x26/0x130 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff88811a306e80
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
 96-byte region [ffff88811a306e80, ffff88811a306ee0)

The buggy address belongs to the physical page:
page:ffffea000468c180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11a306
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea00045bd080 dead000000000004 ffff888100042900
raw: 0000000000000000 0000000000200020 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 115, tgid 115 (udevd), ts 5808116211, free_ts 5808055559
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x213/0x220 mm/page_alloc.c:2637
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2644
 get_page_from_freelist+0x3a98/0x3b10 mm/page_alloc.c:4539
 __alloc_pages+0x234/0x610 mm/page_alloc.c:5837
 alloc_slab_page+0x6c/0xf0 include/linux/gfp.h:-1
 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+0x207/0x2a0 mm/slub.c:3462
 kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1028
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 kernfs_get_open_node fs/kernfs/file.c:574 [inline]
 kernfs_fop_open+0x70e/0xb10 fs/kernfs/file.c:742
 do_dentry_open+0x891/0x1250 fs/open.c:884
 vfs_open+0x73/0x80 fs/open.c:1015
 do_open fs/namei.c:3625 [inline]
 path_openat+0x2532/0x2d60 fs/namei.c:3782
 do_filp_open+0x230/0x480 fs/namei.c:3809
 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:1545 [inline]
 free_pcp_prepare mm/page_alloc.c:1619 [inline]
 free_unref_page_prepare+0x9f1/0xa00 mm/page_alloc.c:3581
 free_unref_page+0xb2/0x5c0 mm/page_alloc.c:3677
 free_the_page mm/page_alloc.c:830 [inline]
 __free_pages+0x61/0xf0 mm/page_alloc.c:5926
 free_pages+0x7c/0x90 mm/page_alloc.c:5937
 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:
 ffff88811a306d80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff88811a306e00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff88811a306e80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                   ^
 ffff88811a306f00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff88811a306f80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
BUG: unable to handle page fault for address: fffffff100000210
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 7012067 P4D 7012067 PUD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1455 Comm: syz.2.298 Tainted: G    B   W          6.1.129-syzkaller-00055-gca24c52e3c25 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__xdp_enqueue kernel/bpf/devmap.c:481 [inline]
RIP: 0010:dev_map_enqueue+0xa0/0x340 kernel/bpf/devmap.c:534
Code: 00 74 08 4c 89 ef e8 5f a0 25 00 bb 20 02 00 00 49 03 5d 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 40 a0 25 00 <48> 83 3b 00 0f 84 eb 00 00 00 49 8d 7f 08 48 89 f8 48 c1 e8 03 42
RSP: 0018:ffffc90000def5f8 EFLAGS: 00010246
RAX: 1ffffffe20000042 RBX: fffffff100000210 RCX: ffffffff8197a441
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88811e9dd8d0
RBP: ffffc90000def638 R08: ffffffff8144b443 R09: fffffbfff0f6e8fd
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88811e9dd8d0 R14: ffff88811e9dd800 R15: ffff88814a277070
FS:  00007f1bf69786c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffff100000210 CR3: 000000014bbfe000 CR4: 00000000003506b0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 __xdp_do_redirect_frame net/core/filter.c:4319 [inline]
 xdp_do_redirect_frame+0x2b5/0x800 net/core/filter.c:4381
 xdp_test_run_batch net/bpf/test_run.c:314 [inline]
 bpf_test_run_xdp_live+0xc30/0x1f70 net/bpf/test_run.c:362
 bpf_prog_test_run_xdp+0x7d1/0x1130 net/bpf/test_run.c:1393
 bpf_prog_test_run+0x3b0/0x630 kernel/bpf/syscall.c:3670
 __sys_bpf+0x59f/0x7f0 kernel/bpf/syscall.c:5025
 __do_sys_bpf kernel/bpf/syscall.c:5111 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5109 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5109
 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
RIP: 0033:0x7f1bf5b8d169
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:00007f1bf6978038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f1bf5da5fa0 RCX: 00007f1bf5b8d169
RDX: 0000000000000050 RSI: 00002000000000c0 RDI: 000000000000000a
RBP: 00007f1bf5c0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1bf5da5fa0 R15: 00007ffdf7be5af8
 </TASK>
Modules linked in:
CR2: fffffff100000210
---[ end trace 0000000000000000 ]---
RIP: 0010:__xdp_enqueue kernel/bpf/devmap.c:481 [inline]
RIP: 0010:dev_map_enqueue+0xa0/0x340 kernel/bpf/devmap.c:534
Code: 00 74 08 4c 89 ef e8 5f a0 25 00 bb 20 02 00 00 49 03 5d 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 40 a0 25 00 <48> 83 3b 00 0f 84 eb 00 00 00 49 8d 7f 08 48 89 f8 48 c1 e8 03 42
RSP: 0018:ffffc90000def5f8 EFLAGS: 00010246
RAX: 1ffffffe20000042 RBX: fffffff100000210 RCX: ffffffff8197a441
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88811e9dd8d0
RBP: ffffc90000def638 R08: ffffffff8144b443 R09: fffffbfff0f6e8fd
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88811e9dd8d0 R14: ffff88811e9dd800 R15: ffff88814a277070
FS:  00007f1bf69786c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffff100000210 CR3: 000000014bbfe000 CR4: 00000000003506b0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	00 74 08 4c          	add    %dh,0x4c(%rax,%rcx,1)
   4:	89 ef                	mov    %ebp,%edi
   6:	e8 5f a0 25 00       	call   0x25a06a
   b:	bb 20 02 00 00       	mov    $0x220,%ebx
  10:	49 03 5d 00          	add    0x0(%r13),%rbx
  14:	48 89 d8             	mov    %rbx,%rax
  17:	48 c1 e8 03          	shr    $0x3,%rax
  1b:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  20:	74 08                	je     0x2a
  22:	48 89 df             	mov    %rbx,%rdi
  25:	e8 40 a0 25 00       	call   0x25a06a
* 2a:	48 83 3b 00          	cmpq   $0x0,(%rbx) <-- trapping instruction
  2e:	0f 84 eb 00 00 00    	je     0x11f
  34:	49 8d 7f 08          	lea    0x8(%r15),%rdi
  38:	48 89 f8             	mov    %rdi,%rax
  3b:	48 c1 e8 03          	shr    $0x3,%rax
  3f:	42                   	rex.X