================================================================== BUG: KASAN: use-after-free in list_empty include/linux/list.h:282 [inline] BUG: KASAN: use-after-free in waitqueue_active include/linux/wait.h:127 [inline] BUG: KASAN: use-after-free in wq_has_sleeper include/linux/wait.h:161 [inline] BUG: KASAN: use-after-free in skwq_has_sleeper include/net/sock.h:2143 [inline] BUG: KASAN: use-after-free in sock_def_write_space+0x609/0x630 net/core/sock.c:2926 Read of size 8 at addr ffff888013c9db00 by task syz-executor.3/10485 CPU: 3 PID: 10485 Comm: syz-executor.3 Not tainted 5.8.0-rc6-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x436 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 list_empty include/linux/list.h:282 [inline] waitqueue_active include/linux/wait.h:127 [inline] wq_has_sleeper include/linux/wait.h:161 [inline] skwq_has_sleeper include/net/sock.h:2143 [inline] sock_def_write_space+0x609/0x630 net/core/sock.c:2926 sock_wfree+0x1cc/0x240 net/core/sock.c:2060 skb_release_head_state+0x9f/0x250 net/core/skbuff.c:651 skb_release_all net/core/skbuff.c:662 [inline] __kfree_skb net/core/skbuff.c:678 [inline] consume_skb net/core/skbuff.c:837 [inline] consume_skb+0x89/0x160 net/core/skbuff.c:831 __dev_kfree_skb_any+0x9c/0xc0 net/core/dev.c:3101 dev_consume_skb_any include/linux/netdevice.h:3738 [inline] napi_consume_skb+0x24f/0x370 net/core/skbuff.c:901 free_old_xmit_skbs+0xd5/0x230 drivers/net/virtio_net.c:1389 start_xmit+0x123/0x15f0 drivers/net/virtio_net.c:1585 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one net/core/dev.c:3556 [inline] dev_hard_start_xmit+0x193/0x950 net/core/dev.c:3572 sch_direct_xmit+0x2ea/0xc00 net/sched/sch_generic.c:313 qdisc_restart net/sched/sch_generic.c:376 [inline] __qdisc_run+0x4b9/0x1630 net/sched/sch_generic.c:384 qdisc_run include/net/pkt_sched.h:134 [inline] qdisc_run include/net/pkt_sched.h:126 [inline] __dev_xmit_skb net/core/dev.c:3747 [inline] __dev_queue_xmit+0x1456/0x2d60 net/core/dev.c:4100 llc_sap_action_send_test_c+0x22e/0x2c0 net/llc/llc_s_ac.c:144 llc_exec_sap_trans_actions net/llc/llc_sap.c:152 [inline] llc_sap_next_state net/llc/llc_sap.c:181 [inline] llc_sap_state_process+0x220/0x4e0 net/llc/llc_sap.c:208 llc_ui_sendmsg+0x970/0x1000 net/llc/af_llc.c:958 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x331/0x810 net/socket.c:2352 ___sys_sendmsg+0xf3/0x170 net/socket.c:2406 __sys_sendmmsg+0x195/0x480 net/socket.c:2496 __do_sys_sendmmsg net/socket.c:2525 [inline] __se_sys_sendmmsg net/socket.c:2522 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2522 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c079 Code: Bad RIP value. RSP: 002b:00007f553f853c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000713f00 RCX: 000000000045c079 RDX: 0400000000000150 RSI: 00000000200001c0 RDI: 0000000000000004 RBP: 00000000004a908e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000074bf00 R13: 00007ffe724e174f R14: 00007f553f834000 R15: 0000000000000003 Allocated by task 10474: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494 slab_post_alloc_hook mm/slab.h:586 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc+0x12c/0x3b0 mm/slab.c:3484 sock_alloc_inode+0x18/0x1c0 net/socket.c:253 alloc_inode+0x61/0x230 fs/inode.c:232 new_inode_pseudo+0x14/0xe0 fs/inode.c:928 sock_alloc+0x3c/0x260 net/socket.c:573 __sock_create+0xb9/0x740 net/socket.c:1392 sock_create net/socket.c:1479 [inline] __sys_socket+0xef/0x200 net/socket.c:1521 __do_sys_socket net/socket.c:1530 [inline] __se_sys_socket net/socket.c:1528 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1528 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 0: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kmem_cache_free+0x7f/0x310 mm/slab.c:3694 i_callback+0x3f/0x70 fs/inode.c:221 rcu_do_batch kernel/rcu/tree.c:2414 [inline] rcu_core+0x5c7/0x1160 kernel/rcu/tree.c:2641 __do_softirq+0x34c/0xa60 kernel/softirq.c:292 The buggy address belongs to the object at ffff888013c9da80 which belongs to the cache sock_inode_cache(49:syz3) of size 1216 The buggy address is located 128 bytes inside of 1216-byte region [ffff888013c9da80, ffff888013c9df40) The buggy address belongs to the page: page:ffffea00004f2740 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888013c9dffd flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0000932c08 ffffea00004f5348 ffff888064a998c0 raw: ffff888013c9dffd ffff888013c9d000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888013c9da00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888013c9da80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888013c9db00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888013c9db80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888013c9dc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================