================================================================== BUG: KASAN: use-after-free in __xfrm6_tunnel_spi_lookup+0x3a9/0x3b0 net/ipv6/xfrm6_tunnel.c:79 Read of size 8 at addr ffff88809f6b4228 by task syz-executor.0/12056 CPU: 1 PID: 12056 Comm: syz-executor.0 Not tainted 5.8.0-rc5-next-20200716-syzkaller #0 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+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 __xfrm6_tunnel_spi_lookup+0x3a9/0x3b0 net/ipv6/xfrm6_tunnel.c:79 xfrm6_tunnel_spi_lookup+0x8a/0x1d0 net/ipv6/xfrm6_tunnel.c:95 xfrmi6_rcv_tunnel+0xb9/0x100 net/xfrm/xfrm_interface.c:824 tunnel46_rcv+0xef/0x2b0 net/ipv6/tunnel6.c:193 ip6_protocol_deliver_rcu+0x2e8/0x1670 net/ipv6/ip6_input.c:433 ip6_input_finish+0x7f/0x160 net/ipv6/ip6_input.c:474 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:483 dst_input include/net/dst.h:449 [inline] ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ipv6_rcv+0x28e/0x3c0 net/ipv6/ip6_input.c:307 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5287 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5401 netif_receive_skb_internal net/core/dev.c:5503 [inline] netif_receive_skb+0x159/0x990 net/core/dev.c:5562 tun_rx_batched.isra.0+0x460/0x720 drivers/net/tun.c:1518 tun_get_user+0x23b2/0x35b0 drivers/net/tun.c:1972 tun_chr_write_iter+0xba/0x151 drivers/net/tun.c:2001 call_write_iter include/linux/fs.h:1879 [inline] new_sync_write+0x422/0x650 fs/read_write.c:515 vfs_write+0x5c6/0x6f0 fs/read_write.c:595 ksys_write+0x12d/0x250 fs/read_write.c:648 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x415c91 Code: Bad RIP value. RSP: 002b:00007f673f677c60 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000078bf00 RCX: 0000000000415c91 RDX: 000000000000004a RSI: 00000000200000c0 RDI: 00000000000000f0 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 00007f673f6789d0 R11: 0000000000000293 R12: 000000000078bf0c R13: 00007ffc377b0b7f R14: 00007f673f6789c0 R15: 000000000078bf0c Allocated by task 7305: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 kmem_cache_alloc_trace+0x16e/0x2c0 mm/slab.c:3550 kmalloc include/linux/slab.h:554 [inline] netdevice_queue_work drivers/infiniband/core/roce_gid_mgmt.c:639 [inline] netdevice_event+0x1ad/0x720 drivers/infiniband/core/roce_gid_mgmt.c:798 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2033 call_netdevice_notifiers_extack net/core/dev.c:2045 [inline] call_netdevice_notifiers net/core/dev.c:2059 [inline] dev_set_mac_address+0x2de/0x3e0 net/core/dev.c:8548 do_setlink+0x1678/0x35c0 net/core/rtnetlink.c:2559 __rtnl_newlink+0xc21/0x1730 net/core/rtnetlink.c:3272 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3397 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5460 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 __sys_sendto+0x21c/0x320 net/socket.c:1994 __do_sys_sendto net/socket.c:2006 [inline] __se_sys_sendto net/socket.c:2002 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2002 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88809f6b4200 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 40 bytes inside of 192-byte region [ffff88809f6b4200, ffff88809f6b42c0) The buggy address belongs to the page: page:000000009a499d14 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88809f6b4f00 pfn:0x9f6b4 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00027dcfc8 ffffea00027dccc8 ffff8880aa000000 raw: ffff88809f6b4f00 ffff88809f6b4000 000000010000000a 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809f6b4100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88809f6b4180: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809f6b4200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809f6b4280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88809f6b4300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================