================================================================== 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.isra.0+0x14a1/0x1550 net/smc/smc_diag.c:81 Read of size 8 at addr ffff88809400d920 by task syz-executor.3/21771 CPU: 1 PID: 21771 Comm: syz-executor.3 Not tainted 4.14.174-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+0x13e/0x194 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1e2 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+0xa9/0x2ae mm/kasan/report.c:393 smc_diag_msg_common_fill net/smc/smc_diag.c:46 [inline] __smc_diag_dump.isra.0+0x14a1/0x1550 net/smc/smc_diag.c:81 smc_diag_dump+0x1d9/0x290 net/smc/smc_diag.c:169 netlink_dump+0x3da/0xab0 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+0x127/0x370 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+0x437/0x620 net/netlink/af_netlink.c:1313 netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xc5/0x100 net/socket.c:656 sock_no_sendpage+0xe5/0x110 net/core/sock.c:2572 kernel_sendpage+0x82/0xd0 net/socket.c:3407 sock_sendpage+0x84/0xa0 net/socket.c:871 pipe_to_sendpage+0x226/0x2d0 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x332/0x740 fs/splice.c:626 splice_from_pipe+0xc6/0x120 fs/splice.c:661 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0xca0/0x1230 fs/splice.c:1382 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c849 RSP: 002b:00007f790d4eec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f790d4ef6d4 RCX: 000000000045c849 RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000009 RBP: 000000000076bf00 R08: 0000000080000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000ba2 R14: 00000000004ce68a R15: 000000000076bf0c Allocated by task 21803: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 kmem_cache_alloc+0x127/0x770 mm/slab.c:3552 sock_alloc_inode+0x19/0x250 net/socket.c:251 alloc_inode+0x5d/0x170 fs/inode.c:209 new_inode_pseudo+0x14/0xe0 fs/inode.c:898 sock_alloc+0x3c/0x270 net/socket.c:569 __sock_create+0x89/0x620 net/socket.c:1239 smc_create+0xfb/0x2f0 net/smc/af_smc.c:1361 __sock_create+0x2f2/0x620 net/socket.c:1275 sock_create net/socket.c:1315 [inline] SYSC_socket net/socket.c:1345 [inline] SyS_socket+0xd2/0x170 net/socket.c:1325 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 21769: save_stack+0x32/0xa0 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+0x7c/0x2b0 mm/slab.c:3758 destroy_inode+0xb9/0x110 fs/inode.c:266 iput_final fs/inode.c:1523 [inline] iput fs/inode.c:1550 [inline] iput+0x457/0x8d0 fs/inode.c:1535 __sock_release+0x232/0x2b0 net/socket.c:615 smc_release+0x1e4/0x610 net/smc/af_smc.c:141 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x790 fs/file_table.c:210 task_work_run+0x113/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1d6/0x220 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+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff88809400d900 which belongs to the cache sock_inode_cache of size 992 The buggy address is located 32 bytes inside of 992-byte region [ffff88809400d900, ffff88809400dce0) The buggy address belongs to the page: page:ffffea0002500340 count:1 mapcount:0 mapping:ffff88809400d000 index:0xffff88809400dffd flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff88809400d000 ffff88809400dffd 0000000100000003 raw: ffffea00025000a0 ffffea0002669ba0 ffff8880a9984900 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809400d800: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88809400d880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809400d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809400d980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809400da00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================