==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 32 at addr ffff88811e571310 by task syz.1.71/555

CPU: 0 PID: 555 Comm: syz.1.71 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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_02c92f715e75ceb8+0x28/0x3d
 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+0x3d0/0x5e0 kernel/events/core.c:10273
 __perf_event_overflow+0x437/0x620 kernel/events/core.c:9448
 perf_event_overflow kernel/events/core.c:9469 [inline]
 perf_swevent_hrtimer+0x400/0x5b0 kernel/events/core.c:10919
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x3bb/0x8e0 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3c7/0x8c0 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:vfs_ioctl fs/ioctl.c:52 [inline]
RIP: 0010:__do_sys_ioctl fs/ioctl.c:870 [inline]
RIP: 0010:__se_sys_ioctl+0x132/0x1b0 fs/ioctl.c:856
Code: ff 4c 8b 65 c0 74 53 e8 5c d6 ac ff 4c 89 f7 48 8b 75 c8 4c 89 e2 41 ba 33 f7 eb 1f 45 03 57 fc 74 02 0f 0b 41 ff d7 49 89 c7 <45> 89 fc 41 bd fd fd ff ff bf fd fd ff ff 4c 89 e6 e8 e8 da ac ff
RSP: 0018:ffffc9000e567e90 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88811ef4a001 RCX: 0000000000080000
RDX: ffffc9000167a000 RSI: 00000000000000d3 RDI: 00000000000000d4
RBP: ffffc9000e567ed0 R08: ffff88811e2e90c3 R09: 1ffff11023c5d218
R10: dffffc0000000000 R11: ffffed1023c5d219 R12: 0000000000000004
R13: dffffc0000000000 R14: ffff88811ef4a000 R15: 0000000000000000
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
 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: 0033:0x7f6871b9cdd9
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:00007f68729a3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6871e15fa0 RCX: 00007f6871b9cdd9
RDX: 0000000000000004 RSI: 0000000040042408 RDI: 0000000000000005
RBP: 00007f6871c32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6871e16038 R14: 00007f6871e15fa0 R15: 00007ffc6653ce28
 </TASK>

Allocated by task 555:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x25/0x30 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+0x3a7/0x530 kernel/bpf/stackmap.c:117
 find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
 map_create+0x49c/0xd80 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 ffff88811e571300
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
 64-byte region [ffff88811e571300, ffff88811e571340)

The buggy address belongs to the physical page:
page:ffffea0004795c40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e571
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 dead000000000001 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 153, tgid 153 (dhcpcd-run-hook), ts 6609199831, 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+0x2d12/0x2d80 mm/page_alloc.c:4585
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5926
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3d0 mm/slub.c:2020
 ___slab_alloc+0x6bd/0xb20 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3423
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc+0xa1/0x1e0 mm/slab_common.c:951
 kmalloc include/linux/slab.h:568 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 ext4_htree_store_dirent+0x88/0x660 fs/ext4/dir.c:485
 htree_dirblock_to_tree+0x8b8/0xeb0 fs/ext4/namei.c:1141
 ext4_htree_fill_tree+0x625/0x1160 fs/ext4/namei.c:1220
 ext4_dx_readdir fs/ext4/dir.c:608 [inline]
 ext4_readdir+0x2f80/0x3e10 fs/ext4/dir.c:145
 iterate_dir+0x271/0x610 fs/readdir.c:-1
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64+0xf2/0x250 fs/readdir.c:354
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88811e571200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88811e571280: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff88811e571300: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff88811e571380: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88811e571400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	4c 8b 65 c0          	mov    -0x40(%rbp),%r12
   4:	74 53                	je     0x59
   6:	e8 5c d6 ac ff       	call   0xffacd667
   b:	4c 89 f7             	mov    %r14,%rdi
   e:	48 8b 75 c8          	mov    -0x38(%rbp),%rsi
  12:	4c 89 e2             	mov    %r12,%rdx
  15:	41 ba 33 f7 eb 1f    	mov    $0x1febf733,%r10d
  1b:	45 03 57 fc          	add    -0x4(%r15),%r10d
  1f:	74 02                	je     0x23
  21:	0f 0b                	ud2
  23:	41 ff d7             	call   *%r15
  26:	49 89 c7             	mov    %rax,%r15
* 29:	45 89 fc             	mov    %r15d,%r12d <-- trapping instruction
  2c:	41 bd fd fd ff ff    	mov    $0xfffffdfd,%r13d
  32:	bf fd fd ff ff       	mov    $0xfffffdfd,%edi
  37:	4c 89 e6             	mov    %r12,%rsi
  3a:	e8 e8 da ac ff       	call   0xffacdb27