Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor7 (pid 9524) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead ================================================================== BUG: KASAN: use-after-free in rt6_select net/ipv6/route.c:757 [inline] BUG: KASAN: use-after-free in ip6_pol_route+0x2989/0x2bb0 net/ipv6/route.c:1093 Read of size 4 at addr ffff8801c37084e8 by task syz-executor3/9523 CPU: 0 PID: 9523 Comm: syz-executor3 Not tainted 4.13.0-rc4+ #5 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x24e/0x340 mm/kasan/report.c:409 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429 rt6_select net/ipv6/route.c:757 [inline] ip6_pol_route+0x2989/0x2bb0 net/ipv6/route.c:1093 ip6_pol_route_output+0x4c/0x60 net/ipv6/route.c:1217 fib6_rule_lookup+0x9e/0x2a0 net/ipv6/ip6_fib.c:281 ip6_route_output_flags+0x1f1/0x2b0 net/ipv6/route.c:1245 ip6_route_output include/net/ip6_route.h:80 [inline] ip6_dst_lookup_tail+0x4ea/0x970 net/ipv6/ip6_output.c:953 ip6_dst_lookup_flow+0xc8/0x270 net/ipv6/ip6_output.c:1076 ip6_datagram_dst_update+0x716/0x11a0 net/ipv6/datagram.c:91 __ip6_datagram_connect+0x531/0xf80 net/ipv6/datagram.c:252 ip6_datagram_connect+0x2f/0x50 net/ipv6/datagram.c:274 inet_dgram_connect+0x16b/0x1f0 net/ipv4/af_inet.c:540 SYSC_connect+0x204/0x470 net/socket.c:1642 SyS_connect+0x24/0x30 net/socket.c:1623 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x4512e9 RSP: 002b:00007f5049c30c08 EFLAGS: 00000216 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00000000007180a8 RCX: 00000000004512e9 RDX: 000000000000001c RSI: 0000000020f69000 RDI: 0000000000000018 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b645f R13: 00000000ffffffff R14: 0000000000000018 R15: 0000000020b11000 Allocated by task 25280: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 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:551 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x127/0x750 mm/slab.c:3561 dst_alloc+0x11f/0x1a0 net/core/dst.c:107 __ip6_dst_alloc+0x34/0x60 net/ipv6/route.c:355 ip6_dst_alloc+0x2d/0x1f0 net/ipv6/route.c:368 ip6_route_info_create+0x4c6/0x24e0 net/ipv6/route.c:1871 ip6_route_add+0xa2/0x1a0 net/ipv6/route.c:2108 inet6_rtm_newroute+0x139/0x150 net/ipv6/route.c:3291 rtnetlink_rcv_msg+0x733/0x1090 net/core/rtnetlink.c:4246 netlink_rcv_skb+0x216/0x440 net/netlink/af_netlink.c:2397 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4258 netlink_unicast_kernel net/netlink/af_netlink.c:1265 [inline] netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1291 netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1854 sock_sendmsg_nosec net/socket.c:633 [inline] sock_sendmsg+0xca/0x110 net/socket.c:643 sock_write_iter+0x31a/0x5d0 net/socket.c:912 call_write_iter include/linux/fs.h:1743 [inline] do_iter_readv_writev+0x525/0x7f0 fs/read_write.c:650 do_iter_write+0x154/0x540 fs/read_write.c:929 vfs_writev+0x18a/0x340 fs/read_write.c:975 do_writev+0xfc/0x2a0 fs/read_write.c:1011 SYSC_writev fs/read_write.c:1084 [inline] SyS_writev+0x27/0x30 fs/read_write.c:1081 entry_SYSCALL_64_fastpath+0x1f/0xbe Freed by task 9258: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3503 [inline] kmem_cache_free+0x77/0x280 mm/slab.c:3763 dst_destroy+0x1de/0x2d0 net/core/dst.c:138 dst_destroy_rcu+0x16/0x20 net/core/dst.c:151 __rcu_reclaim kernel/rcu/rcu.h:195 [inline] rcu_do_batch kernel/rcu/tree.c:2777 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:3031 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2998 [inline] rcu_process_callbacks+0xd3e/0x17b0 kernel/rcu/tree.c:3015 __do_softirq+0x2f5/0xba3 kernel/softirq.c:284 The buggy address belongs to the object at ffff8801c3708380 which belongs to the cache ip6_dst_cache of size 384 The buggy address is located 360 bytes inside of 384-byte region [ffff8801c3708380, ffff8801c3708500) The buggy address belongs to the page: page:ffffea00070dc200 count:1 mapcount:0 mapping:ffff8801c3708000 index:0xffff8801c3708540 flags: 0x200000000000100(slab) raw: 0200000000000100 ffff8801c3708000 ffff8801c3708540 0000000100000008 raw: ffffea000706f2a0 ffffea0006ff7d60 ffff8801d3f5d680 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c3708380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c3708400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801c3708480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801c3708500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8801c3708580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================