==================================================================
BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 lib/list_debug.c:26
Read of size 8 at addr ffff88807e8d45d8 by task syz-fuzzer/3788
CPU: 0 PID: 3788 Comm: syz-fuzzer Not tainted 5.15.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256
__kasan_report mm/kasan/report.c:442 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
__list_add_valid+0x93/0xa0 lib/list_debug.c:26
__list_add include/linux/list.h:67 [inline]
list_add_tail include/linux/list.h:100 [inline]
____napi_schedule net/core/dev.c:4346 [inline]
____napi_schedule net/core/dev.c:4320 [inline]
__napi_schedule+0x186/0x360 net/core/dev.c:6489
virtqueue_napi_schedule drivers/net/virtio_net.c:329 [inline]
skb_xmit_done+0x1d5/0x240 drivers/net/virtio_net.c:356
vring_interrupt drivers/virtio/virtio_ring.c:2155 [inline]
vring_interrupt+0x279/0x400 drivers/virtio/virtio_ring.c:2137
__handle_irq_event_percpu+0x303/0x8f0 kernel/irq/handle.c:156
handle_irq_event_percpu kernel/irq/handle.c:196 [inline]
handle_irq_event+0x102/0x280 kernel/irq/handle.c:213
handle_edge_irq+0x25f/0xd00 kernel/irq/chip.c:822
generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
handle_irq arch/x86/kernel/irq.c:231 [inline]
__common_interrupt+0x9d/0x210 arch/x86/kernel/irq.c:250
common_interrupt+0x9f/0xd0 arch/x86/kernel/irq.c:240
</IRQ>
asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:629
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
Code: 74 24 10 e8 fa 05 21 f8 48 89 ef e8 42 7c 21 f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> 83 67 14 f8 65 8b 05 7c be c6 76 85 c0 74 0a 5b 5d c3 e8 90 dd
RSP: 0018:ffffc900067bf5e8 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1faa502
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffffff9045d508 R08: 0000000000000001 R09: ffffffff8fd0ca9f
R10: 0000000000000001 R11: 000000000000003f R12: 0000000000000006
R13: 0000000000000006 R14: dead000000000100 R15: dffffc0000000000
__debug_check_no_obj_freed lib/debugobjects.c:1002 [inline]
debug_check_no_obj_freed+0x20c/0x420 lib/debugobjects.c:1023
slab_free_hook mm/slub.c:1675 [inline]
slab_free_freelist_hook+0xde/0x190 mm/slub.c:1725
slab_free mm/slub.c:3483 [inline]
kmem_cache_free+0x8a/0x5b0 mm/slub.c:3499
kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:698
__kfree_skb net/core/skbuff.c:755 [inline]
kfree_skb_partial+0x8b/0xa0 net/core/skbuff.c:5340
tcp_data_queue+0x2371/0x4b90 net/ipv4/tcp_input.c:5045
tcp_rcv_established+0x8ad/0x2130 net/ipv4/tcp_input.c:5945
tcp_v4_do_rcv+0x5d4/0x880 net/ipv4/tcp_ipv4.c:1694
sk_backlog_rcv include/net/sock.h:1025 [inline]
__release_sock+0x134/0x3b0 net/core/sock.c:2768
release_sock+0x54/0x1b0 net/core/sock.c:3300
tcp_recvmsg+0x136/0x550 net/ipv4/tcp.c:2537
inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:848
sock_recvmsg_nosec net/socket.c:944 [inline]
sock_recvmsg net/socket.c:962 [inline]
sock_recvmsg net/socket.c:958 [inline]
sock_read_iter+0x33c/0x470 net/socket.c:1035
call_read_iter include/linux/fs.h:2157 [inline]
new_sync_read+0x5ba/0x6e0 fs/read_write.c:404
vfs_read+0x35c/0x600 fs/read_write.c:485
ksys_read+0x1ee/0x250 fs/read_write.c:623
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4b129b
Code: fb ff eb bd e8 46 96 fb ff e9 61 ff ff ff cc e8 3b 62 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30
RSP: 002b:000000c00031b8b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000000c00001e800 RCX: 00000000004b129b
RDX: 0000000000001000 RSI: 000000c00010e000 RDI: 0000000000000006
RBP: 000000c00031b908 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000003
R13: 000000c005d3aa80 R14: 000000c005ca0900 R15: 0000000000000000
Allocated by task 20918:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
____kasan_kmalloc mm/kasan/common.c:472 [inline]
__kasan_kmalloc+0xa4/0xd0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:596 [inline]
sk_prot_alloc+0x110/0x290 net/core/sock.c:1920
sk_alloc+0x30/0xa60 net/core/sock.c:1973
tun_chr_open+0x7b/0x540 drivers/net/tun.c:3361
misc_open+0x372/0x4a0 drivers/char/misc.c:141
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4c8/0x11d0 fs/open.c:822
do_open fs/namei.c:3428 [inline]
path_openat+0x1c9a/0x2740 fs/namei.c:3561
do_filp_open+0x1aa/0x400 fs/namei.c:3588
do_sys_openat2+0x16d/0x4d0 fs/open.c:1200
do_sys_open fs/open.c:1216 [inline]
__do_sys_openat fs/open.c:1232 [inline]
__se_sys_openat fs/open.c:1227 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1227
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 20915:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free mm/kasan/common.c:328 [inline]
__kasan_slab_free+0xff/0x130 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1700 [inline]
slab_free_freelist_hook+0x81/0x190 mm/slub.c:1725
slab_free mm/slub.c:3483 [inline]
kfree+0xe4/0x530 mm/slub.c:4543
sk_prot_free net/core/sock.c:1956 [inline]
__sk_destruct+0x6a8/0x900 net/core/sock.c:2042
sk_destruct+0xbd/0xe0 net/core/sock.c:2057
__sk_free+0xef/0x3d0 net/core/sock.c:2068
sk_free+0x78/0xa0 net/core/sock.c:2079
sock_put include/net/sock.h:1870 [inline]
__tun_detach+0xdb2/0x13d0 drivers/net/tun.c:675
tun_detach drivers/net/tun.c:687 [inline]
tun_chr_close+0xc4/0x180 drivers/net/tun.c:3397
__fput+0x288/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
The buggy address belongs to the object at ffff88807e8d4000
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 1496 bytes inside of
4096-byte region [ffff88807e8d4000, ffff88807e8d5000)
The buggy address belongs to the page:
page:ffffea0001fa3400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e8d0
head:ffffea0001fa3400 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010c42140
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 15085499407, free_ts 13424996726
prep_new_page mm/page_alloc.c:2424 [inline]
get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4153
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5375
alloc_pages+0x1a7/0x300 mm/mempolicy.c:2197
alloc_slab_page mm/slub.c:1763 [inline]
allocate_slab mm/slub.c:1900 [inline]
new_slab+0x319/0x490 mm/slub.c:1963
___slab_alloc+0x921/0xfe0 mm/slub.c:2994
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3081
slab_alloc_node mm/slub.c:3172 [inline]
slab_alloc mm/slub.c:3214 [inline]
kmem_cache_alloc_trace+0x293/0x2b0 mm/slub.c:3231
kmalloc include/linux/slab.h:591 [inline]
copy_mount_options+0x55/0x180 fs/namespace.c:3196
__do_sys_mount fs/namespace.c:3534 [inline]
__se_sys_mount fs/namespace.c:3516 [inline]
__x64_sys_mount+0x1a9/0x300 fs/namespace.c:3516
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1338 [inline]
free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1389
free_unref_page_prepare mm/page_alloc.c:3315 [inline]
free_unref_page+0x19/0x690 mm/page_alloc.c:3394
free_contig_range+0xa8/0xf0 mm/page_alloc.c:9254
destroy_args+0xa8/0x646 mm/debug_vm_pgtable.c:1016
debug_vm_pgtable+0x295b/0x29ed mm/debug_vm_pgtable.c:1329
do_one_initcall+0x103/0x650 init/main.c:1303
do_initcall_level init/main.c:1376 [inline]
do_initcalls init/main.c:1392 [inline]
do_basic_setup init/main.c:1411 [inline]
kernel_init_freeable+0x6b1/0x73a init/main.c:1614
kernel_init+0x1a/0x1d0 init/main.c:1505
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Memory state around the buggy address:
ffff88807e8d4480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e8d4500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807e8d4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807e8d4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e8d4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 74 24 je 0x26
2: 10 e8 adc %ch,%al
4: fa cli
5: 05 21 f8 48 89 add $0x8948f821,%eax
a: ef out %eax,(%dx)
b: e8 42 7c 21 f8 callq 0xf8217c52
10: 81 e3 00 02 00 00 and $0x200,%ebx
16: 75 25 jne 0x3d
18: 9c pushfq
19: 58 pop %rax
1a: f6 c4 02 test $0x2,%ah
1d: 75 2d jne 0x4c
1f: 48 85 db test %rbx,%rbx
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 83 67 14 f8 callq 0xf81467b2 <-- trapping instruction
2f: 65 8b 05 7c be c6 76 mov %gs:0x76c6be7c(%rip),%eax # 0x76c6beb2
36: 85 c0 test %eax,%eax
38: 74 0a je 0x44
3a: 5b pop %rbx
3b: 5d pop %rbp
3c: c3 retq
3d: e8 .byte 0xe8
3e: 90 nop
3f: dd .byte 0xdd