IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready 8021q: adding VLAN 0 to HW filter on device batadv0 ================================================================== BUG: KASAN: use-after-free in smc_diag_msg_common_fill net/smc/smc_diag.c:43 [inline] BUG: KASAN: use-after-free in __smc_diag_dump.isra.4+0x2792/0x2ae0 net/smc/smc_diag.c:93 Read of size 8 at addr ffff888096b3ea60 by task syz-executor0/8260 CPU: 0 PID: 8260 Comm: syz-executor0 Not tainted 4.20.0+ #174 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+0x1d3/0x2c6 lib/dump_stack.c:113 print_address_description.cold.5+0x9/0x1ff mm/kasan/report.c:187 kasan_report.cold.6+0x1b/0x39 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 smc_diag_msg_common_fill net/smc/smc_diag.c:43 [inline] __smc_diag_dump.isra.4+0x2792/0x2ae0 net/smc/smc_diag.c:93 smc_diag_dump_proto.isra.5+0x2e8/0x3c0 net/smc/smc_diag.c:211 smc_diag_dump+0x26/0x70 net/smc/smc_diag.c:225 netlink_dump+0x600/0x1080 net/netlink/af_netlink.c:2244 __netlink_dump_start+0x59a/0x7c0 net/netlink/af_netlink.c:2352 netlink_dump_start include/linux/netlink.h:225 [inline] smc_diag_handler_dump+0x2a3/0x350 net/smc/smc_diag.c:242 __sock_diag_cmd net/core/sock_diag.c:232 [inline] sock_diag_rcv_msg+0x31d/0x410 net/core/sock_diag.c:263 netlink_rcv_skb+0x16c/0x430 net/netlink/af_netlink.c:2477 sock_diag_rcv+0x2a/0x40 net/core/sock_diag.c:274 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x59f/0x750 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2116 __sys_sendmsg+0x11d/0x280 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4579b9 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb29c4e4c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004579b9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000006 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb29c4e56d4 R13: 00000000004c4d3b R14: 00000000004d84a8 R15: 00000000ffffffff Allocated by task 8260: save_stack+0x43/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] kasan_kmalloc+0xcb/0xd0 mm/kasan/common.c:482 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:397 kmem_cache_alloc+0x130/0x730 mm/slab.c:3541 sock_alloc_inode+0x1d/0x260 net/socket.c:244 alloc_inode+0x63/0x190 fs/inode.c:210 new_inode_pseudo+0x71/0x1a0 fs/inode.c:906 sock_alloc+0x41/0x270 net/socket.c:547 __sock_create+0x175/0x930 net/socket.c:1241 sock_create_kern+0x3b/0x50 net/socket.c:1323 smc_create+0x17c/0x3b0 net/smc/af_smc.c:1921 __sock_create+0x536/0x930 net/socket.c:1277 sock_create net/socket.c:1317 [inline] __sys_socket+0x106/0x260 net/socket.c:1347 __do_sys_socket net/socket.c:1356 [inline] __se_sys_socket net/socket.c:1354 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1354 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8258: save_stack+0x43/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:444 kasan_slab_free+0xe/0x10 mm/kasan/common.c:452 __cache_free mm/slab.c:3485 [inline] kmem_cache_free+0x83/0x290 mm/slab.c:3747 sock_destroy_inode+0x51/0x60 net/socket.c:272 destroy_inode+0x159/0x200 fs/inode.c:267 evict+0x5e0/0x980 fs/inode.c:575 iput_final fs/inode.c:1550 [inline] iput+0x679/0xa90 fs/inode.c:1576 __sock_release+0x1ec/0x250 net/socket.c:590 sock_release+0x17/0x20 net/socket.c:598 smc_release+0x297/0x9a0 net/smc/af_smc.c:155 __sock_release+0xd7/0x250 net/socket.c:579 sock_close+0x19/0x20 net/socket.c:1141 __fput+0x385/0xa50 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888096b3ea40 which belongs to the cache sock_inode_cache(17:syz0) of size 976 The buggy address is located 32 bytes inside of 976-byte region [ffff888096b3ea40, ffff888096b3ee10) The buggy address belongs to the page: page:ffffea00025acf80 count:1 mapcount:0 mapping:ffff8880a4cd4780 index:0xffff888096b3effd flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000227a048 ffffea00025a58c8 ffff8880a4cd4780 raw: ffff888096b3effd ffff888096b3e140 0000000100000003 ffff8880a0886dc0 page dumped because: kasan: bad access detected page->mem_cgroup:ffff8880a0886dc0 Memory state around the buggy address: ffff888096b3e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888096b3e980: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888096b3ea00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff888096b3ea80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888096b3eb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================