================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x2d5e/0x3fb0 kernel/locking/lockdep.c:3573 Read of size 8 at addr ffff88806a660160 by task syz-executor.5/9201 CPU: 1 PID: 9201 Comm: syz-executor.5 Not tainted 5.1.0-rc4+ #138 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __lock_acquire+0x2d5e/0x3fb0 kernel/locking/lockdep.c:3573 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4211 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x33/0x50 kernel/locking/spinlock.c:168 spin_lock_bh include/linux/spinlock.h:334 [inline] __lock_sock+0x16d/0x290 net/core/sock.c:2390 lock_sock_nested+0xfe/0x120 net/core/sock.c:2914 lock_sock include/net/sock.h:1520 [inline] sctp_sock_dump+0x122/0xb20 net/sctp/diag.c:325 sctp_for_each_transport+0x2ba/0x360 net/sctp/socket.c:5421 sctp_diag_dump+0x33e/0x450 net/sctp/diag.c:528 __inet_diag_dump+0xa4/0x130 net/ipv4/inet_diag.c:1059 inet_diag_dump+0x9b/0x110 net/ipv4/inet_diag.c:1075 netlink_dump+0x55d/0xfb0 net/netlink/af_netlink.c:2252 __netlink_dump_start+0x5b4/0x7e0 net/netlink/af_netlink.c:2360 netlink_dump_start include/linux/netlink.h:226 [inline] inet_diag_handler_cmd+0x262/0x320 net/ipv4/inet_diag.c:1180 __sock_diag_cmd net/core/sock_diag.c:232 [inline] sock_diag_rcv_msg+0x322/0x410 net/core/sock_diag.c:263 netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2485 sock_diag_rcv+0x2b/0x40 net/core/sock_diag.c:274 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1336 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1925 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:661 sock_write_iter+0x27c/0x3e0 net/socket.c:988 call_write_iter include/linux/fs.h:1866 [inline] do_iter_readv_writev+0x5e1/0x8e0 fs/read_write.c:681 do_iter_write fs/read_write.c:957 [inline] do_iter_write+0x184/0x610 fs/read_write.c:938 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1002 do_writev+0x15e/0x370 fs/read_write.c:1037 __do_sys_writev fs/read_write.c:1110 [inline] __se_sys_writev fs/read_write.c:1107 [inline] __x64_sys_writev+0x75/0xb0 fs/read_write.c:1107 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe7ba695c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000001 RSI: 0000000020000040 RDI: 0000000000000006 RBP: 000000000073c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe7ba6966d4 R13: 00000000004c5996 R14: 00000000004df0e0 R15: 00000000ffffffff Allocated by task 9185: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:505 slab_post_alloc_hook mm/slab.h:437 [inline] slab_alloc mm/slab.c:3394 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3556 sk_prot_alloc+0x67/0x2e0 net/core/sock.c:1601 sk_alloc+0x39/0xf70 net/core/sock.c:1661 inet6_create net/ipv6/af_inet6.c:184 [inline] inet6_create+0x360/0xf90 net/ipv6/af_inet6.c:111 __sock_create+0x3e6/0x750 net/socket.c:1398 sock_create net/socket.c:1449 [inline] __sys_socket+0x103/0x220 net/socket.c:1491 __do_sys_socket net/socket.c:1500 [inline] __se_sys_socket net/socket.c:1498 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1498 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9197: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467 __cache_free mm/slab.c:3500 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3766 sk_prot_free net/core/sock.c:1642 [inline] __sk_destruct+0x4b6/0x6d0 net/core/sock.c:1726 sk_destruct+0x7b/0x90 net/core/sock.c:1734 __sk_free+0xce/0x300 net/core/sock.c:1745 sk_free+0x42/0x50 net/core/sock.c:1756 sock_put include/net/sock.h:1721 [inline] sctp_close+0x70f/0x860 net/sctp/socket.c:1569 inet_release+0x105/0x1f0 net/ipv4/af_inet.c:432 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:474 __sock_release+0xd3/0x2b0 net/socket.c:599 sock_close+0x1b/0x30 net/socket.c:1247 __fput+0x2e5/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 get_signal+0x1961/0x1d50 kernel/signal.c:2390 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88806a6600c0 which belongs to the cache SCTPv6(97:syz5) of size 1944 The buggy address is located 160 bytes inside of 1944-byte region [ffff88806a6600c0, ffff88806a660858) The buggy address belongs to the page: page:ffffea0001a99800 count:1 mapcount:0 mapping:ffff888093e5a800 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002583908 ffffea0001a87d88 ffff888093e5a800 raw: 0000000000000000 ffff88806a6600c0 0000000100000003 ffff88806a04a800 page dumped because: kasan: bad access detected page->mem_cgroup:ffff88806a04a800 Memory state around the buggy address: ffff88806a660000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88806a660080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff88806a660100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806a660180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806a660200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================