SELinux: unrecognized netlink message: protocol=4 nlmsg_type=0 sclass=netlink_tcpdiag_socket pig=7261 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=4 nlmsg_type=0 sclass=netlink_tcpdiag_socket pig=7294 comm=syz-executor.1 ================================================================== BUG: KASAN: use-after-free in smc_diag_msg_common_fill net/smc/smc_diag.c:44 [inline] BUG: KASAN: use-after-free in __smc_diag_dump.isra.0+0x16e0/0x17b0 net/smc/smc_diag.c:82 Read of size 8 at addr ffff8880761a6ae0 by task syz-executor.4/7307 CPU: 0 PID: 7307 Comm: syz-executor.4 Not tainted 4.14.141 #37 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+0x138/0x197 lib/dump_stack.c:53 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 smc_diag_msg_common_fill net/smc/smc_diag.c:44 [inline] __smc_diag_dump.isra.0+0x16e0/0x17b0 net/smc/smc_diag.c:82 smc_diag_dump+0x1e5/0x2a0 net/smc/smc_diag.c:170 netlink_dump+0x3fa/0xb10 net/netlink/af_netlink.c:2202 __netlink_dump_start+0x4ff/0x750 net/netlink/af_netlink.c:2299 netlink_dump_start include/linux/netlink.h:217 [inline] smc_diag_handler_dump+0x1b7/0x200 net/smc/smc_diag.c:191 __sock_diag_cmd net/core/sock_diag.c:231 [inline] sock_diag_rcv_msg+0x29e/0x3a0 net/core/sock_diag.c:263 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432 sock_diag_rcv+0x2b/0x40 net/core/sock_diag.c:274 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x45d/0x640 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 kernel_sendmsg+0x44/0x50 net/socket.c:664 sock_no_sendpage+0x107/0x130 net/core/sock.c:2564 kernel_sendpage+0x92/0xf0 net/socket.c:3406 sock_sendpage+0x8b/0xc0 net/socket.c:871 pipe_to_sendpage+0x242/0x340 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x348/0x780 fs/splice.c:626 splice_from_pipe+0xf0/0x150 fs/splice.c:661 generic_splice_sendpage+0x3c/0x50 fs/splice.c:832 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0xd92/0x1430 fs/splice.c:1382 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459879 RSP: 002b:00007f1544487c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459879 RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 000000000075c070 R08: 0000000080000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f15444886d4 R13: 00000000004c907b R14: 00000000004df4f0 R15: 00000000ffffffff Allocated by task 7307: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x780 mm/slab.c:3552 sock_alloc_inode+0x1d/0x260 net/socket.c:251 alloc_inode+0x64/0x180 fs/inode.c:209 new_inode_pseudo+0x19/0xf0 fs/inode.c:891 sock_alloc+0x41/0x280 net/socket.c:569 __sock_create+0x8f/0x620 net/socket.c:1239 sock_create_kern+0x3b/0x50 net/socket.c:1321 smc_create+0x109/0x300 net/smc/af_smc.c:1361 __sock_create+0x2f6/0x620 net/socket.c:1275 sock_create net/socket.c:1315 [inline] SYSC_socket net/socket.c:1345 [inline] SyS_socket+0xd3/0x170 net/socket.c:1325 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 7281: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kmem_cache_free+0x83/0x2b0 mm/slab.c:3758 sock_destroy_inode+0x54/0x60 net/socket.c:281 destroy_inode+0xc2/0x120 fs/inode.c:266 evict+0x3e6/0x630 fs/inode.c:571 iput_final fs/inode.c:1516 [inline] iput fs/inode.c:1543 [inline] iput+0x471/0x900 fs/inode.c:1528 __sock_release+0x236/0x2b0 net/socket.c:615 sock_release+0x18/0x20 net/socket.c:623 smc_release+0x23b/0x630 net/smc/af_smc.c:141 __sock_release+0xce/0x2b0 net/socket.c:602 sock_close+0x1b/0x30 net/socket.c:1139 __fput+0x275/0x7a0 fs/file_table.c:210 ____fput+0x16/0x20 fs/file_table.c:244 task_work_run+0x114/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1da/0x220 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+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8880761a6ac0 which belongs to the cache sock_inode_cache of size 992 The buggy address is located 32 bytes inside of 992-byte region [ffff8880761a6ac0, ffff8880761a6ea0) The buggy address belongs to the page: page:ffffea0001d86980 count:1 mapcount:0 mapping:ffff8880761a61c0 index:0xffff8880761a6ffd flags: 0x1fffc0000000100(slab) raw: 01fffc0000000100 ffff8880761a61c0 ffff8880761a6ffd 0000000100000003 raw: ffffea000251d4a0 ffffea000251ac60 ffff8880a9e82c00 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880761a6980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880761a6a00: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880761a6a80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8880761a6b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880761a6b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================