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BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:360 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler+0x8c6/0x8d0 net/ipv4/tcp_timer.c:596
Read of size 4 at addr ffff88808fed8650 by task syz-executor.3/30698
CPU: 0 PID: 30698 Comm: syz-executor.3 Not tainted 5.3.0-rc3+ #163
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351
__kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482
kasan_report+0x12/0x17 mm/kasan/common.c:612
__asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131
tcp_probe_timer net/ipv4/tcp_timer.c:360 [inline]
tcp_write_timer_handler+0x8c6/0x8d0 net/ipv4/tcp_timer.c:596
tcp_write_timer+0xa8/0x1e0 net/ipv4/tcp_timer.c:612
call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322
expire_timers kernel/time/timer.c:1366 [inline]
__run_timers kernel/time/timer.c:1685 [inline]
__run_timers kernel/time/timer.c:1653 [inline]
run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698
__do_softirq+0x262/0x98c kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x19b/0x1e0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:537 [inline]
smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1095
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
RIP: 0010:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:49
Code: 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 0f 1f 80 00 00 00 00 b9 00 10 00 00 31 c0 aa c3 90 90 90 90 90 90 55 48 89 e5 41 57 41 56 41 55 41 54 53
RSP: 0000:ffff88809a897760 EFLAGS: 00010246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000381 RCX: 0000000000000540
RDX: 1ffff11012be66b1 RSI: dffffc0000000000 RDI: ffff888083418ac0
RBP: ffff88809a8977b8 R08: ffff888095f323c0 R09: ffffed1010683000
R10: fffff9400041a0c6 R11: ffffea00020d0637 R12: ffffea00020d0600
R13: 0000000000000000 R14: ffffea00020d0600 R15: ffff888095f323c0
get_page_from_freelist+0x1c35/0x39d0 mm/page_alloc.c:3691
__alloc_pages_nodemask+0x2d0/0x900 mm/page_alloc.c:4725
alloc_pages_vma+0xdd/0x560 mm/mempolicy.c:2096
alloc_zeroed_user_highpage_movable include/linux/highmem.h:208 [inline]
wp_page_copy+0xbc3/0x15e0 mm/memory.c:2312
do_wp_page+0x499/0x14d0 mm/memory.c:2619
handle_pte_fault mm/memory.c:3856 [inline]
__handle_mm_fault+0x22f7/0x3f20 mm/memory.c:3964
handle_mm_fault+0x1b5/0x6b0 mm/memory.c:4001
do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
__do_page_fault+0x536/0xdd0 arch/x86/mm/fault.c:1506
do_page_fault+0x38/0x590 arch/x86/mm/fault.c:1530
page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1202
RIP: 0033:0x40e9c8
Code: 8b 34 c6 4a 8d 04 2e 48 3d ff ff ff 7e 0f 86 77 ff ff ff bf 35 ee 4b 00 31 c0 e8 63 33 ff ff 31 ff e8 ac 2f ff ff 0f 1f 40 00 <89> 3c b5 00 00 73 00 eb b6 31 ed 0f 1f 44 00 00 80 3d 9e 1a 66 00
RSP: 002b:00007ffe39928600 EFLAGS: 00010246
RAX: 000000009b158ee0 RBX: 00000000800e568d RCX: 0000001b2ea20000
RDX: 0000000000000000 RSI: 0000000000000ee0 RDI: ffffffff9b158ee0
RBP: 0000000000000008 R08: 000000009b158ee0 R09: 000000009b158ee4
R10: 00007ffe399287a0 R11: 0000000000000246 R12: 000000000075bfa8
R13: 0000000080000000 R14: 00007f90a867f008 R15: 0000000000000008
Allocated by task 3785:
save_stack+0x23/0x90 mm/kasan/common.c:69
set_track mm/kasan/common.c:77 [inline]
__kasan_kmalloc mm/kasan/common.c:487 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:460
kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:495
slab_post_alloc_hook mm/slab.h:520 [inline]
slab_alloc mm/slab.c:3319 [inline]
kmem_cache_alloc+0x121/0x710 mm/slab.c:3483
kmem_cache_zalloc include/linux/slab.h:738 [inline]
net_alloc net/core/net_namespace.c:410 [inline]
copy_net_ns+0xf1/0x41f net/core/net_namespace.c:462
create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:103
unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:202
ksys_unshare+0x444/0x980 kernel/fork.c:2831
__do_sys_unshare kernel/fork.c:2899 [inline]
__se_sys_unshare kernel/fork.c:2897 [inline]
__x64_sys_unshare+0x31/0x40 kernel/fork.c:2897
do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 15559:
save_stack+0x23/0x90 mm/kasan/common.c:69
set_track mm/kasan/common.c:77 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:449
kasan_slab_free+0xe/0x10 mm/kasan/common.c:457
__cache_free mm/slab.c:3425 [inline]
kmem_cache_free+0x86/0x320 mm/slab.c:3693
net_free net/core/net_namespace.c:438 [inline]
net_drop_ns.part.0+0x70/0x90 net/core/net_namespace.c:445
net_drop_ns net/core/net_namespace.c:444 [inline]
cleanup_net+0x774/0xa60 net/core/net_namespace.c:613
process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
worker_thread+0x98/0xe40 kernel/workqueue.c:2415
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
The buggy address belongs to the object at ffff88808fed8080
which belongs to the cache net_namespace of size 6784
The buggy address is located 1488 bytes inside of
6784-byte region [ffff88808fed8080, ffff88808fed9b00)
The buggy address belongs to the page:
page:ffffea00023fb600 refcount:1 mapcount:0 mapping:ffff8880a99a1e00 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea000283b888 ffffea0002917408 ffff8880a99a1e00
raw: 0000000000000000 ffff88808fed8080 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88808fed8500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88808fed8580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88808fed8600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88808fed8680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88808fed8700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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