================================================================== BUG: KASAN: slab-out-of-bounds in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] BUG: KASAN: slab-out-of-bounds in refcount_read include/linux/refcount.h:42 [inline] BUG: KASAN: slab-out-of-bounds in check_net include/net/net_namespace.h:236 [inline] BUG: KASAN: slab-out-of-bounds in rds_destroy_pending net/rds/rds.h:902 [inline] BUG: KASAN: slab-out-of-bounds in rds_cong_queue_updates+0x25d/0x5b0 net/rds/cong.c:226 Read of size 4 at addr ffff8801a3a48084 by task syz-executor2/1470 CPU: 0 PID: 1470 Comm: syz-executor2 Not tainted 4.18.0-rc3+ #127 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] refcount_read include/linux/refcount.h:42 [inline] check_net include/net/net_namespace.h:236 [inline] rds_destroy_pending net/rds/rds.h:902 [inline] rds_cong_queue_updates+0x25d/0x5b0 net/rds/cong.c:226 rds_recv_rcvbuf_delta.part.3+0x332/0x3e0 net/rds/recv.c:123 rds_recv_rcvbuf_delta net/rds/recv.c:382 [inline] rds_recv_incoming+0x85a/0x1320 net/rds/recv.c:382 rds_loop_xmit+0x16a/0x340 net/rds/loop.c:82 rds_send_xmit+0x1343/0x29c0 net/rds/send.c:355 rds_sendmsg+0x229e/0x2a40 net/rds/send.c:1243 sock_sendmsg_nosec net/socket.c:641 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:651 __sys_sendto+0x3d7/0x670 net/socket.c:1797 __do_sys_sendto net/socket.c:1809 [inline] __se_sys_sendto net/socket.c:1805 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1805 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f3eca13fc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f3eca1406d4 RCX: 0000000000455ab9 RDX: 0000000000000481 RSI: 0000000020000000 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 000000002069affb R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c0f1a R14: 00000000004d0e40 R15: 0000000000000000 Allocated by task 21723: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc_track_caller+0x14a/0x760 mm/slab.c:3733 kmemdup+0x24/0x50 mm/util.c:118 kmemdup include/linux/string.h:418 [inline] neigh_sysctl_register+0x98/0x730 net/core/neighbour.c:3169 devinet_sysctl_register+0xb4/0x220 net/ipv4/devinet.c:2361 inetdev_init+0x2dc/0x590 net/ipv4/devinet.c:264 inetdev_event+0xf45/0x1370 net/ipv4/devinet.c:1468 notifier_call_chain+0x180/0x390 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1735 call_netdevice_notifiers net/core/dev.c:1753 [inline] register_netdevice+0xb9d/0x11d0 net/core/dev.c:8028 rtnl_newlink+0x1a29/0x1d60 net/core/rtnetlink.c:3063 rtnetlink_rcv_msg+0x46e/0xc30 net/core/rtnetlink.c:4662 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2448 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4680 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa18/0xfd0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:641 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:651 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2125 __sys_sendmsg+0x11d/0x290 net/socket.c:2163 __do_sys_sendmsg net/socket.c:2172 [inline] __se_sys_sendmsg net/socket.c:2170 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2170 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 23: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 skb_free_head+0x99/0xc0 net/core/skbuff.c:550 skb_release_data+0x6a4/0x880 net/core/skbuff.c:570 skb_release_all+0x4a/0x60 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:641 [inline] consume_skb+0x193/0x560 net/core/skbuff.c:701 netlink_broadcast_filtered+0x6af/0x1630 net/netlink/af_netlink.c:1512 netlink_broadcast net/netlink/af_netlink.c:1534 [inline] nlmsg_multicast include/net/netlink.h:591 [inline] nlmsg_notify+0xa0/0x1a0 net/netlink/af_netlink.c:2491 rtnl_notify net/core/rtnetlink.c:732 [inline] rtmsg_ifinfo_send+0x76/0x90 net/core/rtnetlink.c:3285 rollback_registered_many+0xa7a/0xef0 net/core/dev.c:7489 unregister_netdevice_many+0xfb/0x4d0 net/core/dev.c:8577 ip_tunnel_delete_nets+0x4cb/0x6c0 net/ipv4/ip_tunnel.c:1073 ipip_exit_batch_net+0x22/0x30 net/ipv4/ipip.c:664 ops_exit_list.isra.7+0x105/0x160 net/core/net_namespace.c:155 cleanup_net+0x537/0xb50 net/core/net_namespace.c:523 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 The buggy address belongs to the object at ffff8801a3a48540 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 1212 bytes to the left of 2048-byte region [ffff8801a3a48540, ffff8801a3a48d40) The buggy address belongs to the page: page:ffffea00068e9200 count:1 mapcount:0 mapping:ffff8801da800c40 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea00067c9a88 ffffea00068db888 ffff8801da800c40 raw: 0000000000000000 ffff8801a3a48540 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801a3a47f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801a3a48000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801a3a48080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801a3a48100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801a3a48180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================