==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x2ea2/0x3320 net/ipv4/tcp_timer.c:511
Read of size 8 at addr ffff88807bce02b8 by task syz-executor.0/16594
CPU: 1 PID: 16594 Comm: syz-executor.0 Not tainted 5.16.0-next-20220118-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0xa5/0x3e0 mm/kasan/report.c:255
__kasan_report mm/kasan/report.c:442 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
tcp_retransmit_timer+0x2ea2/0x3320 net/ipv4/tcp_timer.c:511
tcp_write_timer_handler+0x5e6/0xbc0 net/ipv4/tcp_timer.c:622
tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:642
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x67c/0xa30 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:_find_next_bit+0x1de/0x260 lib/find_bit.c:69
Code: ed 4c 89 f6 e8 03 38 90 fd 4d 85 f6 74 08 e8 69 35 90 fd 48 0f cd f3 48 0f bc ed e8 5c 35 90 fd 48 01 eb 49 39 dc 4c 0f 47 e3 4d 35 90 fd 4c 89 e0 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc9000339f600 EFLAGS: 00000216
RAX: 0000000000000000 RBX: 0000000000000100 RCX: 00000000000000cb
RDX: 0000000000000000 RSI: ffff888077d80000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000100 R09: 0000000000000000
R10: ffffffff83e827dd R11: 0000000000000000 R12: 00000000000000cb
R13: ffffffffffffffff R14: 0000000000000000 R15: dffffc0000000000
find_next_zero_bit include/linux/find.h:102 [inline]
pcpu_alloc+0xc72/0x1360 mm/percpu.c:1859
xt_percpu_counter_alloc+0x131/0x1a0 net/netfilter/x_tables.c:1930
find_check_entry.constprop.0+0xae/0x9e0 net/ipv6/netfilter/ip6_tables.c:547
translate_table+0xc8b/0x1750 net/ipv6/netfilter/ip6_tables.c:735
do_replace net/ipv6/netfilter/ip6_tables.c:1153 [inline]
do_ip6t_set_ctl+0x56e/0xb90 net/ipv6/netfilter/ip6_tables.c:1639
nf_setsockopt+0x83/0xe0 net/netfilter/nf_sockopt.c:101
ipv6_setsockopt+0x122/0x180 net/ipv6/ipv6_sockglue.c:1024
tcp_setsockopt+0x136/0x2520 net/ipv4/tcp.c:3685
__sys_setsockopt+0x2db/0x610 net/socket.c:2180
__do_sys_setsockopt net/socket.c:2191 [inline]
__se_sys_setsockopt net/socket.c:2188 [inline]
__x64_sys_setsockopt+0xba/0x150 net/socket.c:2188
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: 0033:0x7fdcd515763a
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 36 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc8de6a028 EFLAGS: 00000202 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000029 RCX: 00007fdcd515763a
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 00007ffc8de6a050 R08: 00000000000003b8 R09: ff00000000000000
R10: 00007fdcd5237bc0 R11: 0000000000000202 R12: 00007ffc8de6a0b0
R13: 0000000000000003 R14: 00007ffc8de6a04c R15: 00007fdcd5237b60
Allocated by task 3627:
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+0x90/0xc0 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+0x202/0x3a0 mm/slub.c:3243
kmem_cache_zalloc include/linux/slab.h:705 [inline]
net_alloc net/core/net_namespace.c:404 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:459
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x445/0x920 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+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
The buggy address belongs to the object at ffff88807bce0000
which belongs to the cache net_namespace of size 6528
The buggy address is located 696 bytes inside of
6528-byte region [ffff88807bce0000, ffff88807bce1980)
The buggy address belongs to the page:
page:ffffea0001ef3800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807bce0000 pfn:0x7bce0
head:ffffea0001ef3800 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88806344f401
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff8881407cf000
raw: ffff88807bce0000 0000000080040002 00000001ffffffff ffff88806344f401
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 3627, ts 173396316475, free_ts 173395556176
prep_new_page mm/page_alloc.c:2434 [inline]
get_page_from_freelist+0xa72/0x2f40 mm/page_alloc.c:4165
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5381
alloc_pages+0x1aa/0x310 mm/mempolicy.c:2271
alloc_slab_page mm/slub.c:1799 [inline]
allocate_slab mm/slub.c:1944 [inline]
new_slab+0x28d/0x380 mm/slub.c:2004
___slab_alloc+0x6be/0xd60 mm/slub.c:3018
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105
slab_alloc_node mm/slub.c:3196 [inline]
slab_alloc mm/slub.c:3238 [inline]
kmem_cache_alloc+0x35c/0x3a0 mm/slub.c:3243
kmem_cache_zalloc include/linux/slab.h:705 [inline]
net_alloc net/core/net_namespace.c:404 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:459
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x445/0x920 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+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:1352 [inline]
free_pcp_prepare+0x414/0xb60 mm/page_alloc.c:1404
free_unref_page_prepare mm/page_alloc.c:3325 [inline]
free_unref_page+0x19/0x690 mm/page_alloc.c:3404
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x718/0x870 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
consume_skb net/core/skbuff.c:914 [inline]
consume_skb+0xc2/0x160 net/core/skbuff.c:908
skb_free_datagram+0x1b/0x1f0 net/core/datagram.c:325
netlink_recvmsg+0x636/0xea0 net/netlink/af_netlink.c:1998
sock_recvmsg_nosec net/socket.c:948 [inline]
sock_recvmsg net/socket.c:966 [inline]
sock_recvmsg net/socket.c:962 [inline]
____sys_recvmsg+0x2c4/0x600 net/socket.c:2632
___sys_recvmsg+0x127/0x200 net/socket.c:2674
__sys_recvmsg+0xe2/0x1a0 net/socket.c:2704
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
Memory state around the buggy address:
ffff88807bce0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807bce0200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807bce0280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807bce0300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807bce0380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: ed in (%dx),%eax
1: 4c 89 f6 mov %r14,%rsi
4: e8 03 38 90 fd callq 0xfd90380c
9: 4d 85 f6 test %r14,%r14
c: 74 08 je 0x16
e: e8 69 35 90 fd callq 0xfd90357c
13: 48 0f cd bswap %rbp
16: f3 48 0f bc ed tzcnt %rbp,%rbp
1b: e8 5c 35 90 fd callq 0xfd90357c
20: 48 01 eb add %rbp,%rbx
23: 49 39 dc cmp %rbx,%r12
26: 4c 0f 47 e3 cmova %rbx,%r12
* 2a: e8 4d 35 90 fd callq 0xfd90357c <-- trapping instruction
2f: 4c 89 e0 mov %r12,%rax
32: 48 83 c4 18 add $0x18,%rsp
36: 5b pop %rbx
37: 5d pop %rbp
38: 41 5c pop %r12
3a: 41 5d pop %r13
3c: 41 5e pop %r14
3e: 41 5f pop %r15