syzbot

netlink: 'syz-executor3': attribute type 29 has an invalid length.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor3'.
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BUG: KASAN: double-free or invalid-free in __rcu_reclaim kernel/rcu/rcu.h:167 [inline]
BUG: KASAN: double-free or invalid-free in rcu_do_batch kernel/rcu/tree.c:2674 [inline]
BUG: KASAN: double-free or invalid-free in invoke_rcu_callbacks kernel/rcu/tree.c:2933 [inline]
BUG: KASAN: double-free or invalid-free in __rcu_process_callbacks kernel/rcu/tree.c:2900 [inline]
BUG: KASAN: double-free or invalid-free in rcu_process_callbacks+0xe94/0x17f0 kernel/rcu/tree.c:2917

CPU: 0 PID: 31543 Comm: modprobe Not tainted 4.16.0-rc6+ #285
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:256
 kasan_report_invalid_free+0x55/0x80 mm/kasan/report.c:336
 __kasan_slab_free+0x145/0x170 mm/kasan/kasan.c:500
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527
 __cache_free mm/slab.c:3485 [inline]
 kfree+0xd9/0x260 mm/slab.c:3800
 __rcu_reclaim kernel/rcu/rcu.h:167 [inline]
 rcu_do_batch kernel/rcu/tree.c:2674 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2933 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2900 [inline]
 rcu_process_callbacks+0xe94/0x17f0 kernel/rcu/tree.c:2917
 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285
 invoke_softirq kernel/softirq.c:365 [inline]
 irq_exit+0x1cc/0x200 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:541 [inline]
 smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1052
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:857
 </IRQ>
RIP: 0010:unwind_get_return_address+0x3d/0xa0 arch/x86/kernel/unwind_frame.c:19
RSP: 0018:ffff8801b29d75e0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff12
RAX: 0000000000000001 RBX: ffff8801b29d7600 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffff8801b29d7d40 RDI: ffff8801b29d7600
RBP: ffff8801b29d75f0 R08: ffff8801b29d7640 R09: ffff8801cec02180
R10: 000000000000000b R11: ffffed003653aeca R12: 0000000000000000
R13: 0000000000000000 R14: ffff8801cec02180 R15: ffff8801da5c7840
 __save_stack_trace+0x7e/0xd0 arch/x86/kernel/stacktrace.c:45
 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 slab_post_alloc_hook mm/slab.h:443 [inline]
 slab_alloc mm/slab.c:3379 [inline]
 kmem_cache_alloc+0x11b/0x760 mm/slab.c:3539
 kmem_cache_zalloc include/linux/slab.h:691 [inline]
 mmap_region+0x7ee/0x15a0 mm/mmap.c:1673
 do_mmap+0x6c0/0xe00 mm/mmap.c:1483
 do_mmap_pgoff include/linux/mm.h:2223 [inline]
 vm_mmap_pgoff+0x1de/0x280 mm/util.c:355
 SYSC_mmap_pgoff mm/mmap.c:1533 [inline]
 SyS_mmap_pgoff+0x462/0x5f0 mm/mmap.c:1491
 SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7fb16f13a3ea
RSP: 002b:00007fffede4def8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fb16f3429a8 RCX: 00007fb16f13a3ea
RDX: 0000000000000003 RSI: 0000000000005000 RDI: 00007fb16ef04000
RBP: 00007fffede4e250 R08: 0000000000000000 R09: 0000000000183000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007fffede4e338
R13: 0000000000000002 R14: 00007fffede4df70 R15: 00007fffede4df40

Allocated by task 31512:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552
 __do_kmalloc mm/slab.c:3705 [inline]
 __kmalloc+0x162/0x760 mm/slab.c:3714
 kmalloc include/linux/slab.h:517 [inline]
 sk_prot_alloc+0x101/0x2a0 net/core/sock.c:1474
 sk_alloc+0x105/0x1440 net/core/sock.c:1528
 __netlink_create+0x6a/0x270 net/netlink/af_netlink.c:642
 netlink_create+0x2fb/0x500 net/netlink/af_netlink.c:704
 __sock_create+0x4d4/0x850 net/socket.c:1285
 sock_create net/socket.c:1325 [inline]
 SYSC_socket net/socket.c:1355 [inline]
 SyS_socket+0xeb/0x1d0 net/socket.c:1335
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 28957:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527
 __cache_free mm/slab.c:3485 [inline]
 kfree+0xd9/0x260 mm/slab.c:3800
 sk_prot_free net/core/sock.c:1511 [inline]
 __sk_destruct+0x750/0x920 net/core/sock.c:1593
 sk_destruct+0x47/0x80 net/core/sock.c:1601
 __sk_free+0xf1/0x2b0 net/core/sock.c:1612
 sk_free+0x2a/0x40 net/core/sock.c:1623
 sock_put include/net/sock.h:1660 [inline]
 af_alg_release+0x5d/0x70 crypto/af_alg.c:126
 sock_release+0x8d/0x1e0 net/socket.c:594
 sock_close+0x16/0x20 net/socket.c:1149
 __fput+0x327/0x7e0 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x73a/0x16d0 kernel/signal.c:2469
 do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x6ec/0x940 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff8801c1a95640
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 1528 bytes inside of
 2048-byte region [ffff8801c1a95640, ffff8801c1a95e40)
The buggy address belongs to the page:
page:ffffea000706a500 count:1 mapcount:0 mapping:ffff8801c1a94540 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801c1a94540 0000000000000000 0000000100000003
raw: ffffea000737e5a0 ffffea00074879a0 ffff8801dac00c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c1a95b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c1a95b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c1a95c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                        ^
 ffff8801c1a95c80: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801c1a95d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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