binder: 15505:15541 ioctl c0306201 20004000 returned -14 binder: 15505:15506 ioctl 40046207 0 returned -16 binder_alloc: 15505: binder_alloc_buf, no vma ================================================================== binder: 15505:15538 transaction failed 29189/-3, size 0-0 line 2963 BUG: KASAN: use-after-free in tipc_sub_unsubscribe+0x22d/0x305 net/tipc/subscr.c:167 Read of size 4 at addr ffff8801bd230498 by task syz-executor3/15533 CPU: 1 PID: 15533 Comm: syz-executor3 Not tainted 4.16.0+ #19 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+0x1b9/0x294 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0xac/0x2f5 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 tipc_sub_unsubscribe+0x22d/0x305 net/tipc/subscr.c:167 tipc_conn_delete_sub+0x32d/0x530 net/tipc/topsrv.c:245 tipc_topsrv_kern_unsubscr+0x280/0x3f0 net/tipc/topsrv.c:598 tipc_group_delete+0x2dd/0x3f0 net/tipc/group.c:231 tipc_sk_leave+0x10e/0x210 net/tipc/socket.c:2800 tipc_release+0x146/0x1290 net/tipc/socket.c:576 sock_release+0x96/0x1b0 net/socket.c:594 sock_close+0x16/0x20 net/socket.c:1149 __fput+0x34d/0x890 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1e4/0x290 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x1aee/0x2730 kernel/exit.c:865 do_group_exit+0x16f/0x430 kernel/exit.c:968 get_signal+0x886/0x1960 kernel/signal.c:2469 do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810 exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:265 [inline] do_syscall_64+0x792/0x9d0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x455279 RSP: 002b:00007f5ad420fce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000072bec8 RCX: 0000000000455279 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bec8 RBP: 000000000072bec8 R08: 0000000000000034 R09: 000000000072bea0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000a3e81f R14: 00007f5ad42109c0 R15: 0000000000000000 Allocated by task 15533: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620 kmalloc include/linux/slab.h:512 [inline] tipc_sub_subscribe+0x25a/0x6b0 net/tipc/subscr.c:143 tipc_conn_rcv_sub.isra.5+0x42c/0x7e0 net/tipc/topsrv.c:381 tipc_topsrv_kern_subscr+0x72b/0xad0 net/tipc/topsrv.c:582 tipc_group_create+0x72e/0xa50 net/tipc/group.c:194 tipc_sk_join net/tipc/socket.c:2766 [inline] tipc_setsockopt+0x2c9/0xd70 net/tipc/socket.c:2881 __sys_setsockopt+0x1bd/0x390 net/socket.c:1903 SYSC_setsockopt net/socket.c:1914 [inline] SyS_setsockopt+0x34/0x50 net/socket.c:1911 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 15533: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 tipc_sub_kref_release net/tipc/subscr.c:117 [inline] kref_put include/linux/kref.h:70 [inline] tipc_sub_put+0x33/0x40 net/tipc/subscr.c:122 tipc_nametbl_unsubscribe+0x52c/0xaf0 net/tipc/name_table.c:709 tipc_sub_unsubscribe+0x6d/0x305 net/tipc/subscr.c:166 tipc_conn_delete_sub+0x32d/0x530 net/tipc/topsrv.c:245 tipc_topsrv_kern_unsubscr+0x280/0x3f0 net/tipc/topsrv.c:598 tipc_group_delete+0x2dd/0x3f0 net/tipc/group.c:231 tipc_sk_leave+0x10e/0x210 net/tipc/socket.c:2800 tipc_release+0x146/0x1290 net/tipc/socket.c:576 sock_release+0x96/0x1b0 net/socket.c:594 sock_close+0x16/0x20 net/socket.c:1149 __fput+0x34d/0x890 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1e4/0x290 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x1aee/0x2730 kernel/exit.c:865 do_group_exit+0x16f/0x430 kernel/exit.c:968 get_signal+0x886/0x1960 kernel/signal.c:2469 do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810 exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:265 [inline] do_syscall_64+0x792/0x9d0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8801bd230400 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 152 bytes inside of 256-byte region [ffff8801bd230400, ffff8801bd230500) The buggy address belongs to the page: page:ffffea0006f48c00 count:1 mapcount:0 mapping:ffff8801bd230040 index:0xffff8801bd230680 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801bd230040 ffff8801bd230680 0000000100000008 raw: ffffea0006b5e5e0 ffffea000722a820 ffff8801dac007c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801bd230380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801bd230400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801bd230480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801bd230500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8801bd230580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================