================================================================== BUG: KASAN: slab-out-of-bounds in __read_once_size include/linux/compiler.h:199 [inline] BUG: KASAN: slab-out-of-bounds in sock_cgroup_ptr include/linux/cgroup.h:836 [inline] BUG: KASAN: slab-out-of-bounds in inet_diag_bc_sk+0xb64/0xc70 net/ipv4/inet_diag.c:749 Read of size 8 at addr ffff88808df04240 by task syz-executor.3/15915 CPU: 0 PID: 15915 Comm: syz-executor.3 Not tainted 5.7.0-rc2-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+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:382 __kasan_report.cold+0x35/0x4d mm/kasan/report.c:511 kasan_report+0x33/0x50 mm/kasan/common.c:625 __read_once_size include/linux/compiler.h:199 [inline] sock_cgroup_ptr include/linux/cgroup.h:836 [inline] inet_diag_bc_sk+0xb64/0xc70 net/ipv4/inet_diag.c:749 inet_diag_dump_icsk+0xbe4/0x1306 net/ipv4/inet_diag.c:1061 __inet_diag_dump+0x8d/0x240 net/ipv4/inet_diag.c:1113 netlink_dump+0x50b/0xf50 net/netlink/af_netlink.c:2245 __netlink_dump_start+0x63f/0x910 net/netlink/af_netlink.c:2353 netlink_dump_start include/linux/netlink.h:246 [inline] inet_diag_handler_cmd+0x263/0x2c0 net/ipv4/inet_diag.c:1278 __sock_diag_cmd net/core/sock_diag.c:233 [inline] sock_diag_rcv_msg+0x2fe/0x3e0 net/core/sock_diag.c:264 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:275 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 sock_write_iter+0x289/0x3c0 net/socket.c:1004 call_write_iter include/linux/fs.h:1907 [inline] do_iter_readv_writev+0x5a8/0x850 fs/read_write.c:694 do_iter_write fs/read_write.c:999 [inline] do_iter_write+0x18b/0x600 fs/read_write.c:980 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1072 do_writev+0x27f/0x300 fs/read_write.c:1115 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: 0d b7 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f20b98f0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000050d140 RCX: 000000000045c829 RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000006 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000d18 R14: 00000000004cb1f4 R15: 00007f20b98f16d4 Allocated by task 11529: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468 kmem_cache_alloc_trace+0x153/0x7d0 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] ipv6_add_addr+0x367/0x1d50 net/ipv6/addrconf.c:1083 add_addr+0xcf/0x2b0 net/ipv6/addrconf.c:3076 sit_add_v4_addrs net/ipv6/addrconf.c:3135 [inline] addrconf_sit_config net/ipv6/addrconf.c:3386 [inline] addrconf_notify+0x1ae6/0x2310 net/ipv6/addrconf.c:3579 notifier_call_chain+0xc0/0x230 kernel/notifier.c:83 call_netdevice_notifiers_info net/core/dev.c:1948 [inline] call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1933 call_netdevice_notifiers_extack net/core/dev.c:1960 [inline] call_netdevice_notifiers net/core/dev.c:1974 [inline] __dev_notify_flags+0x121/0x2c0 net/core/dev.c:8189 rtnl_configure_link+0x169/0x250 net/core/rtnetlink.c:3032 __rtnl_newlink+0xf3f/0x1590 net/core/rtnetlink.c:3358 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3398 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5461 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362 ___sys_sendmsg+0x100/0x170 net/socket.c:2416 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 10818: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:317 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:456 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 skb_free_head+0x8b/0xa0 net/core/skbuff.c:590 skb_release_data+0x42e/0x8b0 net/core/skbuff.c:610 skb_release_all+0x46/0x60 net/core/skbuff.c:664 __kfree_skb net/core/skbuff.c:678 [inline] consume_skb net/core/skbuff.c:837 [inline] consume_skb+0xf3/0x400 net/core/skbuff.c:831 netlink_broadcast_filtered+0x34f/0xd40 net/netlink/af_netlink.c:1513 netlink_broadcast+0x35/0x40 net/netlink/af_netlink.c:1535 uevent_net_broadcast_tagged lib/kobject_uevent.c:371 [inline] kobject_uevent_net_broadcast lib/kobject_uevent.c:411 [inline] kobject_uevent_env+0xfcc/0x11f0 lib/kobject_uevent.c:592 netdev_queue_add_kobject net/core/net-sysfs.c:1554 [inline] netdev_queue_update_kobjects+0x2ee/0x3c0 net/core/net-sysfs.c:1588 register_queue_kobjects net/core/net-sysfs.c:1649 [inline] netdev_register_kobject+0x297/0x3b0 net/core/net-sysfs.c:1892 register_netdevice+0xa80/0x10b0 net/core/dev.c:9404 register_netdev+0x2d/0x50 net/core/dev.c:9528 sit_init_net+0x376/0xa39 net/ipv6/sit.c:1868 ops_init+0xaf/0x420 net/core/net_namespace.c:151 setup_net+0x2de/0x860 net/core/net_namespace.c:341 copy_net_ns+0x293/0x590 net/core/net_namespace.c:482 create_new_namespaces+0x3fb/0xb30 kernel/nsproxy.c:108 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:229 ksys_unshare+0x43d/0x8e0 kernel/fork.c:2969 __do_sys_unshare kernel/fork.c:3037 [inline] __se_sys_unshare kernel/fork.c:3035 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3035 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 The buggy address belongs to the object at ffff88808df04000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 64 bytes to the right of 512-byte region [ffff88808df04000, ffff88808df04200) The buggy address belongs to the page: page:ffffea000237c100 refcount:1 mapcount:0 mapping:00000000da6c36b8 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00029a2348 ffffea000271a308 ffff8880aa000a80 raw: 0000000000000000 ffff88808df04000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808df04100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88808df04180: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc >ffff88808df04200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88808df04280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88808df04300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================