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BUG: KASAN: use-after-free in sock_net_uid include/net/sock.h:1733 [inline]
BUG: KASAN: use-after-free in ip6_route_me_harder+0x9d8/0xc00 net/ipv6/netfilter.c:26
Read of size 4 at addr ffff8801bbc06170 by task syz-executor4/25796
CPU: 1 PID: 25796 Comm: syz-executor4 Not tainted 4.16.0-rc2+ #250
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'.
Call Trace:
__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
netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'.
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report+0x23b/0x360 mm/kasan/report.c:412
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432
sock_net_uid include/net/sock.h:1733 [inline]
ip6_route_me_harder+0x9d8/0xc00 net/ipv6/netfilter.c:26
nf_nat_ipv6_local_fn+0x2a4/0x5d0 net/ipv6/netfilter/nf_nat_l3proto_ipv6.c:414
netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'.
ip6table_nat_local_fn+0x2c/0x40 net/ipv6/netfilter/ip6table_nat.c:69
nf_hook_entry_hookfn include/linux/netfilter.h:120 [inline]
nf_hook_slow+0xba/0x1a0 net/netfilter/core.c:483
nf_hook include/linux/netfilter.h:243 [inline]
NF_HOOK include/linux/netfilter.h:286 [inline]
ip6_xmit+0x10ec/0x2260 net/ipv6/ip6_output.c:277
netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'.
tcp_v6_send_synack+0x57b/0xaa0 net/ipv6/tcp_ipv6.c:490
tcp_conn_request+0x26fd/0x3660 net/ipv4/tcp_input.c:6335
tcp_v6_conn_request+0x212/0x270 net/ipv6/tcp_ipv6.c:1021
tcp_rcv_state_process+0x92a/0x4760 net/ipv4/tcp_input.c:5842
tcp_v6_do_rcv+0x739/0x1250 net/ipv6/tcp_ipv6.c:1331
tcp_v6_rcv+0x25a0/0x2d40 net/ipv6/tcp_ipv6.c:1521
ip6_input_finish+0x37e/0x17a0 net/ipv6/ip6_input.c:284
NF_HOOK include/linux/netfilter.h:288 [inline]
ip6_input+0xdb/0x560 net/ipv6/ip6_input.c:327
dst_input include/net/dst.h:449 [inline]
ip6_rcv_finish+0x297/0x8c0 net/ipv6/ip6_input.c:71
NF_HOOK include/linux/netfilter.h:288 [inline]
ipv6_rcv+0xf37/0x1fa0 net/ipv6/ip6_input.c:208
__netif_receive_skb_core+0x1a41/0x3460 net/core/dev.c:4554
__netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4619
netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4693
netif_receive_skb+0xae/0x390 net/core/dev.c:4717
tun_rx_batched.isra.52+0x5ee/0x870 drivers/net/tun.c:1556
tun_get_user+0x25a5/0x3810 drivers/net/tun.c:1957
tun_chr_write_iter+0xbd/0x1c0 drivers/net/tun.c:1985
call_write_iter include/linux/fs.h:1781 [inline]
do_iter_readv_writev+0x55c/0x830 fs/read_write.c:653
do_iter_write+0x154/0x540 fs/read_write.c:932
vfs_writev+0x18a/0x340 fs/read_write.c:977
do_writev+0xfc/0x2a0 fs/read_write.c:1012
SYSC_writev fs/read_write.c:1085 [inline]
SyS_writev+0x27/0x30 fs/read_write.c:1082
do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x453c41
RSP: 002b:00007f05c9580ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 000000000000004a RCX: 0000000000453c41
RDX: 0000000000000001 RSI: 00007f05c9580bf0 RDI: 00000000000000fc
RBP: 0000000020000100 R08: 00000000000000fc R09: 0000000000000000
R10: 000000000000004a R11: 0000000000000293 R12: 00000000ffffffff
R13: 0000000000000627 R14: 00000000006f9448 R15: 0000000000000001
Allocated by task 4318:
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
kmem_cache_alloc+0x12e/0x760 mm/slab.c:3541
dup_mmap kernel/fork.c:451 [inline]
dup_mm kernel/fork.c:1233 [inline]
copy_mm+0x8d7/0x131f kernel/fork.c:1287
copy_process.part.38+0x1f56/0x4b60 kernel/fork.c:1793
copy_process kernel/fork.c:1606 [inline]
_do_fork+0x1f7/0xf70 kernel/fork.c:2087
SYSC_clone kernel/fork.c:2194 [inline]
SyS_clone+0x37/0x50 kernel/fork.c:2188
do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 22586:
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]
kmem_cache_free+0x83/0x2a0 mm/slab.c:3743
remove_vma+0x162/0x1b0 mm/mmap.c:176
exit_mmap+0x311/0x500 mm/mmap.c:3049
__mmput kernel/fork.c:960 [inline]
mmput+0x223/0x6d0 kernel/fork.c:981
exit_mm kernel/exit.c:544 [inline]
do_exit+0x90a/0x1ad0 kernel/exit.c:852
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+0x6e5/0x940 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
The buggy address belongs to the object at ffff8801bbc06148
which belongs to the cache vm_area_struct of size 200
The buggy address is located 40 bytes inside of
200-byte region [ffff8801bbc06148, ffff8801bbc06210)
The buggy address belongs to the page:
page:ffffea0006ef0180 count:1 mapcount:0 mapping:ffff8801bbc06040 index:0xffff8801bbc06670
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801bbc06040 ffff8801bbc06670 000000010000000c
raw: ffffea000740dd20 ffffea00075d2660 ffff8801da5c3840 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801bbc06000: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
ffff8801bbc06080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801bbc06100: fb fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb
^
ffff8801bbc06180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8801bbc06200: fb fb fc fc fc fc fc fc fc fc fb fb fb fb fb fb
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