nla_parse: 25 callbacks suppressed netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. ================================================================== BUG: KASAN: use-after-free in smc_diag_msg_common_fill net/smc/smc_diag.c:46 [inline] BUG: KASAN: use-after-free in __smc_diag_dump.constprop.0+0x1411/0x14e0 net/smc/smc_diag.c:81 Read of size 8 at addr ffff888042e73120 by task syz-executor.4/23115 CPU: 1 PID: 23115 Comm: syz-executor.4 Not tainted 4.14.191-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 smc_diag_msg_common_fill net/smc/smc_diag.c:46 [inline] __smc_diag_dump.constprop.0+0x1411/0x14e0 net/smc/smc_diag.c:81 smc_diag_dump+0x1be/0x260 net/smc/smc_diag.c:169 netlink_dump+0x39c/0xad0 net/netlink/af_netlink.c:2203 __netlink_dump_start+0x4e2/0x740 net/netlink/af_netlink.c:2300 netlink_dump_start include/linux/netlink.h:217 [inline] smc_diag_handler_dump+0x19d/0x1e0 net/smc/smc_diag.c:190 __sock_diag_cmd net/core/sock_diag.c:231 [inline] sock_diag_rcv_msg+0x28d/0x390 net/core/sock_diag.c:263 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2433 sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:274 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1313 netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45cc79 RSP: 002b:00007fa78b800c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002bec0 RCX: 000000000045cc79 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000004 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffdce47ef4f R14: 00007fa78b8019c0 R15: 000000000078bf0c Allocated by task 23115: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 kmem_cache_alloc+0x124/0x3c0 mm/slab.c:3552 sock_alloc_inode+0x19/0x250 net/socket.c:251 alloc_inode+0x5d/0x170 fs/inode.c:210 new_inode_pseudo+0x14/0xe0 fs/inode.c:899 sock_alloc+0x3c/0x270 net/socket.c:569 __sock_create+0x8a/0x620 net/socket.c:1239 smc_create+0xfb/0x2f0 net/smc/af_smc.c:1361 __sock_create+0x303/0x620 net/socket.c:1275 sock_create net/socket.c:1315 [inline] SYSC_socket net/socket.c:1345 [inline] SyS_socket+0xd1/0x1b0 net/socket.c:1325 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 23114: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kmem_cache_free+0x7c/0x2b0 mm/slab.c:3758 destroy_inode+0xb9/0x110 fs/inode.c:267 iput_final fs/inode.c:1524 [inline] iput+0x458/0x7e0 fs/inode.c:1551 __sock_release net/socket.c:615 [inline] sock_release+0x180/0x1e0 net/socket.c:623 smc_release+0x1e4/0x5d0 net/smc/af_smc.c:141 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff888042e73100 which belongs to the cache sock_inode_cache of size 1000 The buggy address is located 32 bytes inside of 1000-byte region [ffff888042e73100, ffff888042e734e8) The buggy address belongs to the page: page:ffffea00010b9cc0 count:1 mapcount:0 mapping:ffff888042e73100 index:0xffff888042e73ffd flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff888042e73100 ffff888042e73ffd 0000000100000003 raw: ffffea000214fc60 ffffea00010ba560 ffff88821b7cb3c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888042e73000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888042e73080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888042e73100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888042e73180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888042e73200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================