==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 32 at addr ffff888131169e90 by task syz.1.631/2581

CPU: 0 PID: 2581 Comm: syz.1.631 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <IRQ>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report+0x122/0x150 mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
 memcpy+0x44/0x70 mm/kasan/shadow.c:66
 __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline]
 bpf_get_stackid_pe+0x2ee/0x400 kernel/bpf/stackmap.c:334
 bpf_prog_43b50326510579ba+0x21/0x36
 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
 __bpf_prog_run include/linux/filter.h:607 [inline]
 bpf_prog_run include/linux/filter.h:614 [inline]
 bpf_overflow_handler+0x3c7/0x5e0 kernel/events/core.c:10273
 __perf_event_overflow+0x458/0x640 kernel/events/core.c:9448
 perf_event_overflow kernel/events/core.c:9469 [inline]
 perf_swevent_hrtimer+0x4b4/0x540 kernel/events/core.c:10919
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x398/0x890 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3ad/0x8c0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x11e/0x440 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
Code: 7b 68 48 83 c3 60 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 43 79 f2 ff 48 8b 13 4c 89 f7 4c 89 fe e8 15 00 00 00 <5b> 41 5c 41 5e 41 5f 5d c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 55
RSP: 0018:ffffc900010f7ee0 EFLAGS: 00000282
RAX: 0000000000000000 RBX: ffffc900010f7fb8 RCX: 0000000000080000
RDX: ffffc9000169a000 RSI: 0000000000000030 RDI: 0000000000000031
RBP: ffffc900010f7f00 R08: ffff88811989e63f R09: 1ffff11023313cc7
R10: dffffc0000000000 R11: ffffed1023313cc8 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000005 R15: 0000000040042408
 x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff18859ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff1894c4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff188815fa0 RCX: 00007ff18859ce59
RDX: 0000000000000004 RSI: 0000000040042408 RDI: 0000000000000005
RBP: 00007ff188632e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff188816038 R14: 00007ff188815fa0 R15: 00007ffccfd2b918
 </TASK>

Allocated by task 2581:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:380 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc_node+0xb2/0x1e0 mm/slab_common.c:945
 kmalloc_node include/linux/slab.h:589 [inline]
 __bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline]
 bpf_map_area_alloc+0x4b/0xe0 kernel/bpf/syscall.c:341
 prealloc_elems_and_freelist+0x8a/0x1e0 kernel/bpf/stackmap.c:51
 stack_map_alloc+0x398/0x520 kernel/bpf/stackmap.c:117
 find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
 map_create+0x467/0xcf0 kernel/bpf/syscall.c:1126
 __sys_bpf+0x34e/0x850 kernel/bpf/syscall.c:4988
 __do_sys_bpf kernel/bpf/syscall.c:5110 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5108 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5108
 x64_sys_call+0x488/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff888131169e80
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
 64-byte region [ffff888131169e80, ffff888131169ec0)

The buggy address belongs to the physical page:
page:ffffea0004c45a40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x131169
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004caa740 dead000000000002 ffff888100042780
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 288, tgid 288 (syz-executor), ts 22703090841, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679
 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4586
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3e0 mm/slub.c:2020
 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423
 kmalloc_trace+0x29/0xb0 mm/slab_common.c:1028
 kmalloc include/linux/slab.h:563 [inline]
 netdev_name_node_alloc net/core/dev.c:260 [inline]
 netdev_name_node_head_alloc net/core/dev.c:274 [inline]
 register_netdevice+0x2ea/0x1550 net/core/dev.c:10130
 veth_newlink+0x8ba/0xd60 drivers/net/veth.c:1776
 rtnl_newlink_create net/core/rtnetlink.c:3425 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3645 [inline]
 rtnl_newlink+0x14dc/0x20d0 net/core/rtnetlink.c:3658
 rtnetlink_rcv_msg+0xb28/0xde0 net/core/rtnetlink.c:6153
 netlink_rcv_skb+0x200/0x450 net/netlink/af_netlink.c:2521
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6171
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888131169d80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff888131169e00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888131169e80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff888131169f00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888131169f80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
   0:	7b 68                	jnp    0x6a
   2:	48 83 c3 60          	add    $0x60,%rbx
   6:	48 89 d8             	mov    %rbx,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 43 79 f2 ff       	call   0xfff2795f
  1c:	48 8b 13             	mov    (%rbx),%rdx
  1f:	4c 89 f7             	mov    %r14,%rdi
  22:	4c 89 fe             	mov    %r15,%rsi
  25:	e8 15 00 00 00       	call   0x3f
* 2a:	5b                   	pop    %rbx <-- trapping instruction
  2b:	41 5c                	pop    %r12
  2d:	41 5e                	pop    %r14
  2f:	41 5f                	pop    %r15
  31:	5d                   	pop    %rbp
  32:	c3                   	ret
  33:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  3a:	00 00 00
  3d:	66 90                	xchg   %ax,%ax
  3f:	55                   	push   %rbp