==================================================================
BUG: KASAN: use-after-free in dev_map_enqueue+0x40/0x340 kernel/bpf/devmap.c:532
Read of size 8 at addr ffff888131e9ab00 by task syz.2.1637/6403
CPU: 0 PID: 6403 Comm: syz.2.1637 Not tainted 6.1.129-syzkaller-00051-gc1fd50266bd6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__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: 0033:0x7fcdae58d169
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:00007fcdae3de038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fcdae7a6080 RCX: 00007fcdae58d169
RDX: 0000000000000050 RSI: 00002000000000c0 RDI: 000000000000000a
RBP: 00007fcdae60e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fcdae7a6080 R15: 00007ffc74d143a8
Allocated by task 6360:
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:589 [inline]
bpf_map_kmalloc_node+0xd0/0x2c0 kernel/bpf/syscall.c:454
__dev_map_alloc_node+0x5c/0x4e0 kernel/bpf/devmap.c:851
__dev_map_update_elem kernel/bpf/devmap.c:916 [inline]
dev_map_update_elem+0x20e/0x3f0 kernel/bpf/devmap.c:935
bpf_map_update_value+0x23a/0x410 kernel/bpf/syscall.c:228
map_update_elem+0x500/0x680 kernel/bpf/syscall.c:1443
__sys_bpf+0x460/0x7f0 kernel/bpf/syscall.c:4995
__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 339:
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
dev_map_free+0x593/0x6c0 kernel/bpf/devmap.c:238
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
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]
nf_nat_masq_schedule+0x4bc/0x600 net/netfilter/nf_nat_masquerade.c:130
masq_inet6_event+0x124/0x180 net/netfilter/nf_nat_masquerade.c:295
notifier_call_chain kernel/notifier.c:87 [inline]
atomic_notifier_call_chain+0x95/0x100 kernel/notifier.c:225
inet6addr_notifier_call_chain+0x24/0x30 net/ipv6/addrconf_core.c:109
addrconf_ifdown+0xe5e/0x1ab0 net/ipv6/addrconf.c:3948
addrconf_notify+0x32f/0xe10 net/ipv6/addrconf.c:-1
notifier_call_chain kernel/notifier.c:87 [inline]
raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:455
__dev_notify_flags+0x304/0x610 net/core/dev.c:-1
dev_change_flags+0xf0/0x1a0 net/core/dev.c:8687
dev_ifsioc+0x177/0x1150 net/core/dev_ioctl.c:327
dev_ioctl+0x543/0xe60 net/core/dev_ioctl.c:588
sock_do_ioctl+0x26b/0x450 net/socket.c:1208
sock_ioctl+0x455/0x740 net/socket.c:1311
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0x114/0x190 fs/ioctl.c:856
__x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
x64_sys_call+0x98/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
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
The buggy address belongs to the object at ffff888131e9ab00
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
96-byte region [ffff888131e9ab00, ffff888131e9ab60)
The buggy address belongs to the physical page:
page:ffffea0004c7a680 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x131e9a
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea00043403c0 dead000000000007 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 5209, tgid 5208 (syz.1.1312), ts 200904620845, free_ts 200891474442
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]
nf_nat_masq_schedule+0x2d1/0x600 net/netfilter/nf_nat_masquerade.c:118
masq_inet6_event+0x124/0x180 net/netfilter/nf_nat_masquerade.c:295
notifier_call_chain kernel/notifier.c:87 [inline]
atomic_notifier_call_chain+0x95/0x100 kernel/notifier.c:225
inet6addr_notifier_call_chain+0x24/0x30 net/ipv6/addrconf_core.c:109
addrconf_ifdown+0xe5e/0x1ab0 net/ipv6/addrconf.c:3948
addrconf_notify+0x32f/0xe10 net/ipv6/addrconf.c:-1
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
tlb_batch_list_free mm/mmu_gather.c:75 [inline]
tlb_finish_mmu+0x311/0x3f0 mm/mmu_gather.c:364
exit_mmap+0x45b/0xbb0 mm/mmap.c:3359
__mmput+0x95/0x310 kernel/fork.c:1299
mmput+0x56/0x170 kernel/fork.c:1322
copy_process+0x2242/0x3530 kernel/fork.c:2637
kernel_clone+0x229/0x890 kernel/fork.c:2785
__do_sys_clone kernel/fork.c:2928 [inline]
__se_sys_clone kernel/fork.c:2912 [inline]
__x64_sys_clone+0x231/0x280 kernel/fork.c:2912
x64_sys_call+0x1b0/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:57
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
Memory state around the buggy address:
ffff888131e9aa00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888131e9aa80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888131e9ab00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
^
ffff888131e9ab80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888131e9ac00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
general protection fault, probably for non-canonical address 0xdffffc0000000044: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000220-0x0000000000000227]
CPU: 0 PID: 6403 Comm: syz.2.1637 Tainted: G B 6.1.129-syzkaller-00051-gc1fd50266bd6 #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+0x91/0x340 kernel/bpf/devmap.c:534
Code: d0 00 00 00 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ef e8 9f 9e 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 80 9e 25 00 48 83 3b 00 0f 84 eb
RSP: 0018:ffffc90000c075f8 EFLAGS: 00010206
RAX: 0000000000000044 RBX: 0000000000000220 RCX: ffffffff8197a441
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888130e5fed0
RBP: ffffc90000c07638 R08: ffffffff8144b443 R09: fffffbfff0f6e8fd
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff888130e5fed0 R14: ffff888130e5fe00 R15: ffff888122e62070
FS: 00007fcdae3de6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001214d9000 CR4: 00000000003506b0
DR0: 0010000010000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
__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: 0033:0x7fcdae58d169
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:00007fcdae3de038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fcdae7a6080 RCX: 00007fcdae58d169
RDX: 0000000000000050 RSI: 00002000000000c0 RDI: 000000000000000a
RBP: 00007fcdae60e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fcdae7a6080 R15: 00007ffc74d143a8
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__xdp_enqueue kernel/bpf/devmap.c:481 [inline]
RIP: 0010:dev_map_enqueue+0x91/0x340 kernel/bpf/devmap.c:534
Code: d0 00 00 00 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ef e8 9f 9e 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 80 9e 25 00 48 83 3b 00 0f 84 eb
RSP: 0018:ffffc90000c075f8 EFLAGS: 00010206
RAX: 0000000000000044 RBX: 0000000000000220 RCX: ffffffff8197a441
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888130e5fed0
RBP: ffffc90000c07638 R08: ffffffff8144b443 R09: fffffbfff0f6e8fd
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff888130e5fed0 R14: ffff888130e5fe00 R15: ffff888122e62070
FS: 00007fcdae3de6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001214d9000 CR4: 00000000003506b0
DR0: 0010000010000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: d0 00 rolb (%rax)
2: 00 00 add %al,(%rax)
4: 4c 89 e8 mov %r13,%rax
7: 48 c1 e8 03 shr $0x3,%rax
b: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1)
10: 74 08 je 0x1a
12: 4c 89 ef mov %r13,%rdi
15: e8 9f 9e 25 00 call 0x259eb9
1a: bb 20 02 00 00 mov $0x220,%ebx
1f: 49 03 5d 00 add 0x0(%r13),%rbx
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 48 89 df mov %rbx,%rdi
34: e8 80 9e 25 00 call 0x259eb9
39: 48 83 3b 00 cmpq $0x0,(%rbx)
3d: 0f .byte 0xf
3e: 84 eb test %ch,%bl