==================================================================
BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:377 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler net/ipv4/tcp_timer.c:620 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler+0x998/0x9f0 net/ipv4/tcp_timer.c:590
Read of size 1 at addr ffff88802f0406a5 by task swapper/0/0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc4-next-20220628-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:317 [inline]
print_report.cold+0x2ba/0x719 mm/kasan/report.c:433
kasan_report+0xbe/0x1f0 mm/kasan/report.c:495
tcp_probe_timer net/ipv4/tcp_timer.c:377 [inline]
tcp_write_timer_handler net/ipv4/tcp_timer.c:620 [inline]
tcp_write_timer_handler+0x998/0x9f0 net/ipv4/tcp_timer.c:590
tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:633
call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
expire_timers kernel/time/timer.c:1519 [inline]
__run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790
__run_timers kernel/time/timer.c:1768 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
__do_softirq+0x29b/0x9c2 kernel/softirq.c:571
invoke_softirq kernel/softirq.c:445 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:113 [inline]
RIP: 0010:acpi_idle_do_entry+0x1c9/0x240 drivers/acpi/processor_idle.c:555
Code: 89 de e8 9a 7a fe f7 84 db 75 98 e8 01 7e fe f7 e8 ec cc 04 f8 66 90 e8 f5 7d fe f7 0f 00 2d 7e 28 b8 00 e8 e9 7d fe f7 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 c4 7a fe f7 48 85 db
RSP: 0018:ffffffff8ba07d38 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffffffff8babc980 RSI: ffffffff897c3927 RDI: 0000000000000000
RBP: ffff888017299064 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: ffff888017299000 R14: ffff888017299064 R15: ffff8881468f9804
acpi_idle_enter+0x364/0x500 drivers/acpi/processor_idle.c:692
cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:238
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:352
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:236 [inline]
do_idle+0x3e8/0x590 kernel/sched/idle.c:303
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
rest_init+0x169/0x270 init/main.c:729
arch_call_rest_init+0xf/0x14 init/main.c:886
start_kernel+0x473/0x494 init/main.c:1142
secondary_startup_64_no_verify+0xce/0xdb
Allocated by task 3637:
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:224 [inline]
slab_post_alloc_hook mm/slab.h:736 [inline]
slab_alloc_node mm/slub.c:3243 [inline]
slab_alloc mm/slub.c:3251 [inline]
__kmem_cache_alloc_lru mm/slub.c:3258 [inline]
kmem_cache_alloc+0x2d6/0x4c0 mm/slub.c:3268
kmem_cache_zalloc include/linux/slab.h:723 [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:227
ksys_unshare+0x445/0x920 kernel/fork.c:3162
__do_sys_unshare kernel/fork.c:3233 [inline]
__se_sys_unshare kernel/fork.c:3231 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3231
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+0x46/0xb0
Freed by task 11:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:45
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:328
kasan_slab_free include/linux/kasan.h:200 [inline]
slab_free_hook mm/slub.c:1754 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780
slab_free mm/slub.c:3534 [inline]
kmem_cache_free+0xeb/0x5b0 mm/slub.c:3551
net_free net/core/net_namespace.c:433 [inline]
net_free net/core/net_namespace.c:429 [inline]
cleanup_net+0x8ba/0xb00 net/core/net_namespace.c:616
process_one_work+0x991/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
Last potentially related work creation:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
__kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348
insert_work+0x48/0x350 kernel/workqueue.c:1358
__queue_work+0x625/0x1140 kernel/workqueue.c:1517
call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
expire_timers kernel/time/timer.c:1514 [inline]
__run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1790
__run_timers kernel/time/timer.c:1768 [inline]
run_timer_softirq+0x152/0x1d0 kernel/time/timer.c:1805
__do_softirq+0x29b/0x9c2 kernel/softirq.c:571
Second to last potentially related work creation:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
__kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348
insert_work+0x48/0x350 kernel/workqueue.c:1358
__queue_work+0x625/0x1140 kernel/workqueue.c:1517
call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
expire_timers kernel/time/timer.c:1514 [inline]
__run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1790
__run_timers kernel/time/timer.c:1768 [inline]
run_timer_softirq+0x152/0x1d0 kernel/time/timer.c:1805
__do_softirq+0x29b/0x9c2 kernel/softirq.c:571
The buggy address belongs to the object at ffff88802f040000
which belongs to the cache net_namespace of size 6784
The buggy address is located 1701 bytes inside of
6784-byte region [ffff88802f040000, ffff88802f041a80)
The buggy address belongs to the physical page:
page:ffffea0000bc1000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2f040
head:ffffea0000bc1000 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88801c2fb541
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888140007500
raw: 0000000000000000 0000000080040004 00000001ffffffff ffff88801c2fb541
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 3637, tgid 3637 (syz-executor.3), ts 337958300998, free_ts 0
prep_new_page mm/page_alloc.c:2535 [inline]
get_page_from_freelist+0x210d/0x3a30 mm/page_alloc.c:4282
__alloc_pages+0x1c7/0x510 mm/page_alloc.c:5506
alloc_pages+0x1aa/0x310 mm/mempolicy.c:2280
alloc_slab_page mm/slub.c:1824 [inline]
allocate_slab+0x27e/0x3d0 mm/slub.c:1969
new_slab mm/slub.c:2029 [inline]
___slab_alloc+0x89d/0xef0 mm/slub.c:3031
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118
slab_alloc_node mm/slub.c:3209 [inline]
slab_alloc mm/slub.c:3251 [inline]
__kmem_cache_alloc_lru mm/slub.c:3258 [inline]
kmem_cache_alloc+0x3fb/0x4c0 mm/slub.c:3268
kmem_cache_zalloc include/linux/slab.h:723 [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:227
ksys_unshare+0x445/0x920 kernel/fork.c:3162
__do_sys_unshare kernel/fork.c:3233 [inline]
__se_sys_unshare kernel/fork.c:3231 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3231
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+0x46/0xb0
page_owner free stack trace missing
Memory state around the buggy address:
ffff88802f040580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802f040600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802f040680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802f040700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802f040780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 89 de mov %ebx,%esi
2: e8 9a 7a fe f7 callq 0xf7fe7aa1
7: 84 db test %bl,%bl
9: 75 98 jne 0xffffffa3
b: e8 01 7e fe f7 callq 0xf7fe7e11
10: e8 ec cc 04 f8 callq 0xf804cd01
15: 66 90 xchg %ax,%ax
17: e8 f5 7d fe f7 callq 0xf7fe7e11
1c: 0f 00 2d 7e 28 b8 00 verw 0xb8287e(%rip) # 0xb828a1
23: e8 e9 7d fe f7 callq 0xf7fe7e11
28: fb sti
29: f4 hlt
* 2a: 9c pushfq <-- trapping instruction
2b: 5b pop %rbx
2c: 81 e3 00 02 00 00 and $0x200,%ebx
32: fa cli
33: 31 ff xor %edi,%edi
35: 48 89 de mov %rbx,%rsi
38: e8 c4 7a fe f7 callq 0xf7fe7b01
3d: 48 85 db test %rbx,%rbx