================================================================== 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 ffff88808f9fc200 by task syz-executor.3/14433 CPU: 0 PID: 14433 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:00007f4dc952ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000050d140 RCX: 000000000045c829 RDX: 0000000000000004 RSI: 0000000020000040 RDI: 0000000000000006 RBP: 000000000078c180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000d18 R14: 00000000004cb1f4 R15: 00007f4dc952f6d4 Allocated by task 10614: 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 slab_post_alloc_hook mm/slab.h:586 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc+0x11b/0x740 mm/slab.c:3484 kmem_cache_zalloc include/linux/slab.h:659 [inline] __kernfs_new_node+0xd4/0x690 fs/kernfs/dir.c:627 kernfs_new_node+0x93/0x120 fs/kernfs/dir.c:689 __kernfs_create_file+0x51/0x350 fs/kernfs/file.c:1001 sysfs_add_file_mode_ns+0x224/0x520 fs/sysfs/file.c:305 sysfs_merge_group+0x198/0x320 fs/sysfs/group.c:343 dpm_sysfs_add+0x247/0x290 drivers/base/power/sysfs.c:670 device_add+0x966/0x1bf0 drivers/base/core.c:2479 netdev_register_kobject+0x180/0x3b0 net/core/net-sysfs.c:1888 register_netdevice+0xa80/0x10b0 net/core/dev.c:9404 ipip6_tunnel_create+0x3f9/0x600 net/ipv6/sit.c:208 ipip6_newlink+0x147/0x350 net/ipv6/sit.c:1589 __rtnl_newlink+0xf18/0x1590 net/core/rtnetlink.c:3340 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 0: (stack is not available) The buggy address belongs to the object at ffff88808f9fc128 which belongs to the cache kernfs_node_cache of size 168 The buggy address is located 48 bytes to the right of 168-byte region [ffff88808f9fc128, ffff88808f9fc1d0) The buggy address belongs to the page: page:ffffea00023e7f00 refcount:1 mapcount:0 mapping:00000000812428ba index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00029f9648 ffffea00026734c8 ffff88821bc508c0 raw: 0000000000000000 ffff88808f9fc040 0000000100000011 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808f9fc100: fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 ffff88808f9fc180: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc >ffff88808f9fc200: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88808f9fc280: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 ffff88808f9fc300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================