================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:199 [inline] BUG: KASAN: use-after-free in sock_cgroup_ptr include/linux/cgroup.h:836 [inline] BUG: KASAN: use-after-free in inet_diag_bc_sk+0xa5a/0xfa0 net/ipv4/inet_diag.c:749 Read of size 8 at addr ffff88809f8c9200 by task syz-executor.5/8453 CPU: 1 PID: 8453 Comm: syz-executor.5 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+0x128/0x182 lib/dump_stack.c:118 print_address_description.constprop.8.cold.10+0x9/0x317 mm/kasan/report.c:382 __kasan_report.cold.11+0x35/0x4d mm/kasan/report.c:511 kasan_report+0x32/0x50 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+0xa5a/0xfa0 net/ipv4/inet_diag.c:749 inet_diag_dump_icsk+0x98c/0xf30 net/ipv4/inet_diag.c:1061 __inet_diag_dump+0xf7/0x1b0 net/ipv4/inet_diag.c:1113 netlink_dump+0x481/0xf50 net/netlink/af_netlink.c:2245 __netlink_dump_start+0x567/0x820 net/netlink/af_netlink.c:2353 netlink_dump_start include/linux/netlink.h:246 [inline] inet_diag_handler_cmd+0x1fe/0x280 net/ipv4/inet_diag.c:1278 __sock_diag_cmd net/core/sock_diag.c:233 [inline] sock_diag_rcv_msg+0x282/0x370 net/core/sock_diag.c:264 netlink_rcv_skb+0x119/0x340 net/netlink/af_netlink.c:2469 sock_diag_rcv+0x21/0x30 net/core/sock_diag.c:275 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x434/0x630 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x714/0xc60 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xac/0xe0 net/socket.c:672 sock_write_iter+0x218/0x380 net/socket.c:1004 call_write_iter include/linux/fs.h:1907 [inline] do_iter_readv_writev+0x4f1/0x7c0 fs/read_write.c:694 do_iter_write+0x129/0x540 fs/read_write.c:999 vfs_writev+0x16d/0x2d0 fs/read_write.c:1072 do_writev+0x214/0x280 fs/read_write.c:1115 do_syscall_64+0xc6/0x620 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:00007f3278f3bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000050d140 RCX: 000000000045c829 RDX: 0000000000000001 RSI: 0000000020000200 RDI: 0000000000000006 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000d18 R14: 00000000004cb1f4 R15: 00007f3278f3c6d4 Allocated by task 7182: save_stack+0x19/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc.constprop.17+0xc1/0xd0 mm/kasan/common.c:495 __kmalloc_reserve.isra.46+0x29/0xa0 net/core/skbuff.c:142 __alloc_skb+0xbd/0x510 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1083 [inline] nlmsg_new include/net/netlink.h:888 [inline] rtmsg_fib+0x17f/0xcb0 net/ipv4/fib_semantics.c:512 fib_table_insert+0x730/0x1980 net/ipv4/fib_trie.c:1352 fib_magic.isra.23+0x34a/0x500 net/ipv4/fib_frontend.c:1084 fib_add_ifaddr+0x2e1/0x460 net/ipv4/fib_frontend.c:1119 fib_netdev_event+0x1c1/0x390 net/ipv4/fib_frontend.c:1465 notifier_call_chain+0x86/0x150 kernel/notifier.c:83 call_netdevice_notifiers_extack net/core/dev.c:1960 [inline] call_netdevice_notifiers net/core/dev.c:1974 [inline] __dev_notify_flags+0xda/0x240 net/core/dev.c:8189 dev_change_flags+0xdf/0x160 net/core/dev.c:8227 do_setlink+0x963/0x2ca0 net/core/rtnetlink.c:2605 __rtnl_newlink+0x9cb/0x1250 net/core/rtnetlink.c:3273 rtnl_newlink+0x5c/0x80 net/core/rtnetlink.c:3398 rtnetlink_rcv_msg+0x346/0x8c0 net/core/rtnetlink.c:5461 netlink_rcv_skb+0x119/0x340 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x434/0x630 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x714/0xc60 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xac/0xe0 net/socket.c:672 __sys_sendto+0x1d9/0x2b0 net/socket.c:2000 __do_sys_sendto net/socket.c:2012 [inline] __se_sys_sendto net/socket.c:2008 [inline] __x64_sys_sendto+0xd8/0x1b0 net/socket.c:2008 do_syscall_64+0xc6/0x620 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 7182: save_stack+0x19/0x40 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+0x107/0x2b0 mm/slab.c:3757 pskb_expand_head+0x25f/0xaa0 net/core/skbuff.c:1660 netlink_trim+0x191/0x1f0 net/netlink/af_netlink.c:1285 netlink_broadcast_filtered+0x57/0xab0 net/netlink/af_netlink.c:1490 netlink_broadcast net/netlink/af_netlink.c:1535 [inline] nlmsg_multicast include/net/netlink.h:968 [inline] nlmsg_notify+0x68/0x150 net/netlink/af_netlink.c:2512 rtmsg_fib+0x353/0xcb0 net/ipv4/fib_semantics.c:531 fib_table_insert+0x730/0x1980 net/ipv4/fib_trie.c:1352 fib_magic.isra.23+0x34a/0x500 net/ipv4/fib_frontend.c:1084 fib_add_ifaddr+0x2e1/0x460 net/ipv4/fib_frontend.c:1119 fib_netdev_event+0x1c1/0x390 net/ipv4/fib_frontend.c:1465 notifier_call_chain+0x86/0x150 kernel/notifier.c:83 call_netdevice_notifiers_extack net/core/dev.c:1960 [inline] call_netdevice_notifiers net/core/dev.c:1974 [inline] __dev_notify_flags+0xda/0x240 net/core/dev.c:8189 dev_change_flags+0xdf/0x160 net/core/dev.c:8227 do_setlink+0x963/0x2ca0 net/core/rtnetlink.c:2605 __rtnl_newlink+0x9cb/0x1250 net/core/rtnetlink.c:3273 rtnl_newlink+0x5c/0x80 net/core/rtnetlink.c:3398 rtnetlink_rcv_msg+0x346/0x8c0 net/core/rtnetlink.c:5461 netlink_rcv_skb+0x119/0x340 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x434/0x630 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x714/0xc60 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xac/0xe0 net/socket.c:672 __sys_sendto+0x1d9/0x2b0 net/socket.c:2000 __do_sys_sendto net/socket.c:2012 [inline] __se_sys_sendto net/socket.c:2008 [inline] __x64_sys_sendto+0xd8/0x1b0 net/socket.c:2008 do_syscall_64+0xc6/0x620 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 The buggy address belongs to the object at ffff88809f8c9000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 512 bytes inside of 1024-byte region [ffff88809f8c9000, ffff88809f8c9400) The buggy address belongs to the page: page:ffffea00027e3240 refcount:1 mapcount:0 mapping:0000000037a253c0 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000230f7c8 ffffea0002696448 ffff8880aa400c40 raw: 0000000000000000 ffff88809f8c9000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809f8c9100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809f8c9180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809f8c9200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809f8c9280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809f8c9300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================