==================================================================
BUG: KASAN: use-after-free in inet_twsk_kill+0x358/0x3c0 net/ipv4/inet_timewait_sock.c:46
Read of size 8 at addr ffff88803eafc280 by task syz-executor/9755
CPU: 0 PID: 9755 Comm: syz-executor Not tainted 5.17.0-rc1-next-20220127 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106
print_address_description.constprop.0+0x1f/0x190 mm/kasan/report.c:255
__kasan_report mm/kasan/report.c:442 [inline]
kasan_report.cold+0x7f/0x11b mm/kasan/report.c:459
inet_twsk_kill+0x358/0x3c0 net/ipv4/inet_timewait_sock.c:46
call_timer_fn+0x182/0x600 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x666/0xa00 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1747
__do_softirq+0x270/0x8c7 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x113/0x170 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x2e/0x50 kernel/locking/spinlock.c:194
Code: 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 3a d8 1e fd 48 89 ef e8 a2 53 1f fd 80 e7 02 74 06 e8 b8 fa 3f fd fb bf 01 00 00 00 7d 0f 15 fd 65 8b 05 a6 5e f8 7b 85 c0 74 03 5b 5d c3 0f 1f 44
RSP: 0018:ffff88800f9dfbc8 EFLAGS: 00000206
RAX: 000000000048f321 RBX: 0000000000000286 RCX: 1ffffffff0d4697e
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffffff8735a680 R08: 0000000000000001 R09: ffffffff86a14857
R10: fffffbfff0d4290a R11: 0000000000000001 R12: fffffbfff0e6b4d8
R13: ffff88807ed51000 R14: ffffffff8735a680 R15: 0000000000000286
scan_object mm/kmemleak.c:1358 [inline]
scan_gray_list+0x16b/0x3b0 mm/kmemleak.c:1390
kmemleak_scan+0x56b/0x12c0 mm/kmemleak.c:1498
kmemleak_write+0x56f/0x6a0 mm/kmemleak.c:1835
full_proxy_write+0x11d/0x190 fs/debugfs/file.c:236
vfs_write+0x28a/0xae0 fs/read_write.c:589
ksys_write+0x12d/0x250 fs/read_write.c:644
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f71f632f5c3
Code: 16 00 00 00 eb ae 90 b8 6e 00 00 00 eb a6 e8 44 ef 04 00 0f 1f 40 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 48 89 54 24 18
RSP: 002b:00007ffc7609c898 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffc7609ced8 RCX: 00007f71f632f5c3
RDX: 0000000000000004 RSI: 00007f71f63e5ed9 RDI: 0000000000000003
RBP: 0000000000000006 R08: 00000000000004b4 R09: 00007ffc760be080
R10: 00007ffc760be090 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc7609c970 R14: 0000000000000000 R15: 0000000000000003
Allocated by task 295:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:436 [inline]
__kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:469
kasan_slab_alloc include/linux/kasan.h:260 [inline]
slab_post_alloc_hook mm/slab.h:732 [inline]
slab_alloc_node mm/slub.c:3230 [inline]
slab_alloc mm/slub.c:3238 [inline]
kmem_cache_alloc+0x1aa/0x480 mm/slub.c:3243
kmem_cache_zalloc include/linux/slab.h:705 [inline]
net_alloc net/core/net_namespace.c:407 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:462
create_new_namespaces+0x3f6/0xb30 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x445/0x8d0 kernel/fork.c:3048
__do_sys_unshare kernel/fork.c:3119 [inline]
__se_sys_unshare kernel/fork.c:3117 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3117
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
The buggy address belongs to the object at ffff88803eafbe40
which belongs to the cache net_namespace of size 5056
The buggy address is located 1088 bytes inside of
5056-byte region [ffff88803eafbe40, ffff88803eafd200)
The buggy address belongs to the page:
page:00000000a856e4ce refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88803eafbe40 pfn:0x3eaf8
head:00000000a856e4ce order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88800d0fd081
flags: 0x100000000010200(slab|head|node=0|zone=1)
raw: 0100000000010200 0000000000000000 dead000000000001 ffff88800805d640
raw: ffff88803eafbe40 0000000080060004 00000001ffffffff ffff88800d0fd081
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88803eafc180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88803eafc200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88803eafc280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88803eafc300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88803eafc380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
device syz_tun entered promiscuous mode
device syz_tun left promiscuous mode
device syz_tun entered promiscuous mode
device syz_tun left promiscuous mode
----------------
Code disassembly (best guess):
0: 48 83 c7 18 add $0x18,%rdi
4: 53 push %rbx
5: 48 89 f3 mov %rsi,%rbx
8: 48 8b 74 24 10 mov 0x10(%rsp),%rsi
d: e8 3a d8 1e fd callq 0xfd1ed84c
12: 48 89 ef mov %rbp,%rdi
15: e8 a2 53 1f fd callq 0xfd1f53bc
1a: 80 e7 02 and $0x2,%bh
1d: 74 06 je 0x25
1f: e8 b8 fa 3f fd callq 0xfd3ffadc
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 7d 0f 15 fd callq 0xfd150fac <-- trapping instruction
2f: 65 8b 05 a6 5e f8 7b mov %gs:0x7bf85ea6(%rip),%eax # 0x7bf85edc
36: 85 c0 test %eax,%eax
38: 74 03 je 0x3d
3a: 5b pop %rbx
3b: 5d pop %rbp
3c: c3 retq
3d: 0f .byte 0xf
3e: 1f (bad)
3f: 44 rex.R