==================================================================
BUG: KASAN: slab-out-of-bounds in decode_session6+0xfc3/0x17f0 net/xfrm/xfrm_policy.c:3376
Read of size 1 at addr ffff88807e6d93bf by task syz-executor.4/5384
CPU: 0 PID: 5384 Comm: syz-executor.4 Not tainted 6.0.0-rc5-syzkaller-00007-g6504d82f4440 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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+0xb1/0x1e0 mm/kasan/report.c:495
decode_session6+0xfc3/0x17f0 net/xfrm/xfrm_policy.c:3376
__xfrm_decode_session+0x50/0xb0 net/xfrm/xfrm_policy.c:3482
xfrm_decode_session include/net/xfrm.h:1160 [inline]
xfrmi_xmit+0x16f/0x1780 net/xfrm/xfrm_interface.c:356
__netdev_start_xmit include/linux/netdevice.h:4819 [inline]
netdev_start_xmit include/linux/netdevice.h:4833 [inline]
xmit_one net/core/dev.c:3590 [inline]
dev_hard_start_xmit+0x183/0x880 net/core/dev.c:3606
sch_direct_xmit+0x19f/0xbe0 net/sched/sch_generic.c:342
qdisc_restart net/sched/sch_generic.c:407 [inline]
__qdisc_run+0x4bb/0x1710 net/sched/sch_generic.c:415
__dev_xmit_skb net/core/dev.c:3880 [inline]
__dev_queue_xmit+0x2299/0x3ad0 net/core/dev.c:4222
dev_queue_xmit include/linux/netdevice.h:3008 [inline]
neigh_connected_output+0x3c0/0x520 net/core/neighbour.c:1581
neigh_output include/net/neighbour.h:551 [inline]
ip6_finish_output2+0x564/0x1520 net/ipv6/ip6_output.c:134
__ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
ip6_finish_output+0x690/0x1160 net/ipv6/ip6_output.c:206
NF_HOOK_COND include/linux/netfilter.h:296 [inline]
ip6_output+0x1ed/0x540 net/ipv6/ip6_output.c:227
dst_output include/net/dst.h:451 [inline]
NF_HOOK include/linux/netfilter.h:307 [inline]
ndisc_send_skb+0xa5f/0x1730 net/ipv6/ndisc.c:508
ndisc_send_rs+0x12e/0x6f0 net/ipv6/ndisc.c:718
addrconf_rs_timer+0x3ed/0x820 net/ipv6/addrconf.c:3931
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+0x1d3/0x9c6 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+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:finish_task_switch.isra.0+0x2bf/0xc70 kernel/sched/core.c:5062
Code: 8b 3a 4c 89 e7 48 c7 02 00 00 00 00 ff d1 4d 85 ff 75 bf 4c 89 e7 e8 60 f8 ff ff e8 bb 43 2f 00 fb 65 48 8b 1c 25 80 6f 02 00 <48> 8d bb 98 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc9000ba1f568 EFLAGS: 00000202
RAX: 0000000000007bdf RBX: ffff88807df81d80 RCX: 1ffffffff21247de
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000ba1f5b0 R08: 0000000000000001 R09: ffffffff908e39ef
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880b9a39f80
R13: ffff888078c4d880 R14: 0000000000000000 R15: 0000000000000000
context_switch kernel/sched/core.c:5185 [inline]
__schedule+0xae7/0x52b0 kernel/sched/core.c:6494
preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6663
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0x57/0x70 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:404 [inline]
__wake_up_common_lock+0xde/0x130 kernel/sched/wait.c:139
__unix_dgram_recvmsg+0x2cd/0xb80 net/unix/af_unix.c:2434
unix_dgram_recvmsg+0xc0/0xe0 net/unix/af_unix.c:2504
sock_recvmsg_nosec net/socket.c:995 [inline]
____sys_recvmsg+0x536/0x600 net/socket.c:2699
___sys_recvmsg+0xf2/0x180 net/socket.c:2743
do_recvmmsg+0x25e/0x6e0 net/socket.c:2837
__sys_recvmmsg net/socket.c:2916 [inline]
__do_sys_recvmmsg net/socket.c:2939 [inline]
__se_sys_recvmmsg net/socket.c:2932 [inline]
__x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2932
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+0x63/0xcd
RIP: 0033:0x7fa0e26893c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa0e378c168 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fa0e279c050 RCX: 00007fa0e26893c9
RDX: 0000000000010106 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00007fa0e26e433f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffae6518df R14: 00007fa0e378c300 R15: 0000000000022000
Allocated by task 2971:
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:437 [inline]
____kasan_kmalloc mm/kasan/common.c:516 [inline]
____kasan_kmalloc mm/kasan/common.c:475 [inline]
__kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:733 [inline]
kernfs_fop_open+0x2fa/0xfd0 fs/kernfs/file.c:680
do_dentry_open+0x4a4/0x13a0 fs/open.c:878
do_open fs/namei.c:3557 [inline]
path_openat+0x1c92/0x28f0 fs/namei.c:3691
do_filp_open+0x1b6/0x400 fs/namei.c:3718
do_sys_openat2+0x16d/0x4c0 fs/open.c:1311
do_sys_open fs/open.c:1327 [inline]
__do_sys_openat fs/open.c:1343 [inline]
__se_sys_openat fs/open.c:1338 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1338
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+0x63/0xcd
Freed by task 5384:
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:367 [inline]
____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329
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]
kfree+0xe2/0x580 mm/slub.c:4562
skb_free_head+0xac/0x110 net/core/skbuff.c:662
skb_release_data+0x5f1/0x870 net/core/skbuff.c:691
skb_release_all net/core/skbuff.c:756 [inline]
__kfree_skb net/core/skbuff.c:770 [inline]
kfree_skb_reason.part.0+0xdd/0x320 net/core/skbuff.c:792
kfree_skb_reason+0x85/0x110 include/linux/refcount.h:279
kfree_skb include/linux/skbuff.h:1206 [inline]
ipip6_tunnel_xmit net/ipv6/sit.c:1041 [inline]
sit_tunnel_xmit+0x114f/0x2b70 net/ipv6/sit.c:1076
__netdev_start_xmit include/linux/netdevice.h:4819 [inline]
netdev_start_xmit include/linux/netdevice.h:4833 [inline]
xmit_one net/core/dev.c:3590 [inline]
dev_hard_start_xmit+0x183/0x880 net/core/dev.c:3606
__dev_queue_xmit+0x2c31/0x3ad0 net/core/dev.c:4256
dev_queue_xmit include/linux/netdevice.h:3008 [inline]
neigh_connected_output+0x3c0/0x520 net/core/neighbour.c:1581
neigh_output include/net/neighbour.h:551 [inline]
ip6_finish_output2+0x564/0x1520 net/ipv6/ip6_output.c:134
__ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
ip6_finish_output+0x690/0x1160 net/ipv6/ip6_output.c:206
NF_HOOK_COND include/linux/netfilter.h:296 [inline]
ip6_output+0x1ed/0x540 net/ipv6/ip6_output.c:227
dst_output include/net/dst.h:451 [inline]
NF_HOOK include/linux/netfilter.h:307 [inline]
ndisc_send_skb+0xa5f/0x1730 net/ipv6/ndisc.c:508
ndisc_send_rs+0x12e/0x6f0 net/ipv6/ndisc.c:718
addrconf_rs_timer+0x3ed/0x820 net/ipv6/addrconf.c:3931
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+0x1d3/0x9c6 kernel/softirq.c:571
The buggy address belongs to the object at ffff88807e6d9000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 447 bytes to the right of
512-byte region [ffff88807e6d9000, ffff88807e6d9200)
The buggy address belongs to the physical page:
page:ffffea0001f9b600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e6d8
head:ffffea0001f9b600 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001f74700 dead000000000002 ffff888011841c80
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 0, tgid 0 (swapper/0), ts 118766781765, free_ts 75548302380
prep_new_page mm/page_alloc.c:2532 [inline]
get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283
__alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515
alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270
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+0x7f1/0xe10 mm/slub.c:3031
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118
slab_alloc_node mm/slub.c:3209 [inline]
__kmalloc_node_track_caller+0x2f2/0x380 mm/slub.c:4955
kmalloc_reserve net/core/skbuff.c:362 [inline]
__alloc_skb+0xd9/0x2f0 net/core/skbuff.c:434
__napi_alloc_skb+0x93/0x340 net/core/skbuff.c:575
napi_alloc_skb include/linux/skbuff.h:3207 [inline]
page_to_skb+0x17d/0xc10 drivers/net/virtio_net.c:496
receive_mergeable drivers/net/virtio_net.c:1119 [inline]
receive_buf+0xe0a/0x5560 drivers/net/virtio_net.c:1258
virtnet_receive drivers/net/virtio_net.c:1553 [inline]
virtnet_poll+0x708/0x1310 drivers/net/virtio_net.c:1671
__napi_poll+0xb3/0x6d0 net/core/dev.c:6511
napi_poll net/core/dev.c:6578 [inline]
net_rx_action+0x9c1/0xd90 net/core/dev.c:6689
__do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1449 [inline]
free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499
free_unref_page_prepare mm/page_alloc.c:3380 [inline]
free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476
skb_free_frag include/linux/skbuff.h:3185 [inline]
skb_free_head+0x96/0x110 net/core/skbuff.c:660
skb_release_data+0x5f1/0x870 net/core/skbuff.c:691
skb_release_all net/core/skbuff.c:756 [inline]
napi_consume_skb net/core/skbuff.c:1012 [inline]
napi_consume_skb+0x145/0x280 net/core/skbuff.c:990
skb_defer_free_flush net/core/dev.c:6659 [inline]
net_rx_action+0x342/0xd90 net/core/dev.c:6680
__do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
Memory state around the buggy address:
ffff88807e6d9280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807e6d9300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807e6d9380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88807e6d9400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e6d9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 8b 3a mov (%rdx),%edi
2: 4c 89 e7 mov %r12,%rdi
5: 48 c7 02 00 00 00 00 movq $0x0,(%rdx)
c: ff d1 callq *%rcx
e: 4d 85 ff test %r15,%r15
11: 75 bf jne 0xffffffd2
13: 4c 89 e7 mov %r12,%rdi
16: e8 60 f8 ff ff callq 0xfffff87b
1b: e8 bb 43 2f 00 callq 0x2f43db
20: fb sti
21: 65 48 8b 1c 25 80 6f mov %gs:0x26f80,%rbx
28: 02 00
* 2a: 48 8d bb 98 15 00 00 lea 0x1598(%rbx),%rdi <-- trapping instruction
31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
38: fc ff df
3b: 48 89 fa mov %rdi,%rdx
3e: 48 rex.W
3f: c1 .byte 0xc1