================================================================== BUG: KASAN: slab-out-of-bounds in cgroup_id include/linux/cgroup.h:312 [inline] BUG: KASAN: slab-out-of-bounds in inet_diag_bc_sk+0xb6e/0xc70 net/ipv4/inet_diag.c:749 Read of size 8 at addr ffff8880982f05c8 by task syz-executor.0/21603 CPU: 0 PID: 21603 Comm: syz-executor.0 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 cgroup_id include/linux/cgroup.h:312 [inline] inet_diag_bc_sk+0xb6e/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:00007fed3fd56c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000050d140 RCX: 000000000045c829 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000d18 R14: 00000000004cb1f4 R15: 00007fed3fd576d4 Allocated by task 9922: 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 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x161/0x7a0 mm/slab.c:3665 kmalloc include/linux/slab.h:560 [inline] kzalloc include/linux/slab.h:669 [inline] new_dir fs/proc/proc_sysctl.c:939 [inline] get_subdir fs/proc/proc_sysctl.c:984 [inline] __register_sysctl_table+0x83f/0xef0 fs/proc/proc_sysctl.c:1327 neigh_sysctl_register+0x347/0x680 net/core/neighbour.c:3694 devinet_sysctl_register+0xb1/0x230 net/ipv4/devinet.c:2611 inetdev_init+0x227/0x4b0 net/ipv4/devinet.c:276 inetdev_event+0xfdb/0x15b0 net/ipv4/devinet.c:1530 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] register_netdevice+0xd70/0x10b0 net/core/dev.c:9435 ieee80211_if_add+0xfd8/0x1850 net/mac80211/iface.c:1953 ieee80211_register_hw+0x381b/0x3960 net/mac80211/main.c:1284 mac80211_hwsim_new_radio+0x2246/0x44a0 drivers/net/wireless/mac80211_hwsim.c:3119 hwsim_new_radio_nl+0x8fe/0xf50 drivers/net/wireless/mac80211_hwsim.c:3680 genl_family_rcv_msg_doit net/netlink/genetlink.c:673 [inline] genl_family_rcv_msg net/netlink/genetlink.c:718 [inline] genl_rcv_msg+0x627/0xdf0 net/netlink/genetlink.c:735 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 genl_rcv+0x24/0x40 net/netlink/genetlink.c:746 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 3573: 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] kmem_cache_free_bulk+0x7d/0x280 mm/slab.c:3721 kfree_bulk include/linux/slab.h:412 [inline] kfree_rcu_work+0x1a1/0x480 kernel/rcu/tree.c:2859 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8880982f0400 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 200 bytes to the right of 256-byte region [ffff8880982f0400, ffff8880982f0500) The buggy address belongs to the page: page:ffffea000260bc00 refcount:1 mapcount:0 mapping:000000006f897b39 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002475b48 ffffea0002414248 ffff8880aa0008c0 raw: 0000000000000000 ffff8880982f0000 0000000100000008 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880982f0480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 06 ffff8880982f0500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880982f0580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880982f0600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880982f0680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc ==================================================================