================================================================== 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:2925 Read of size 8 at addr ffff88804d7d95c0 by task syz-executor.5/29547 CPU: 1 PID: 29547 Comm: syz-executor.5 Not tainted 5.9.0-rc3-syzkaller #0 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+0x198/0x1fd lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 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:2925 sock_wfree+0x1cc/0x240 net/core/sock.c:2052 skb_release_head_state+0x9f/0x250 net/core/skbuff.c:651 skb_release_all net/core/skbuff.c:662 [inline] _kfree_skb_defer net/core/skbuff.c:874 [inline] napi_consume_skb net/core/skbuff.c:919 [inline] napi_consume_skb+0x12e/0x370 net/core/skbuff.c:896 free_old_xmit_skbs+0xd5/0x230 drivers/net/virtio_net.c:1389 virtnet_poll_tx+0x1e9/0x370 drivers/net/virtio_net.c:1516 napi_poll net/core/dev.c:6688 [inline] net_rx_action+0x4f8/0xf90 net/core/dev.c:6758 __do_softirq+0x1f7/0xa91 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77 do_softirq kernel/softirq.c:343 [inline] do_softirq+0x154/0x1b0 kernel/softirq.c:330 __local_bh_enable_ip+0x196/0x1f0 kernel/softirq.c:195 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:723 [inline] ip6_finish_output2+0x913/0x1780 net/ipv6/ip6_output.c:118 __ip6_finish_output net/ipv6/ip6_output.c:143 [inline] __ip6_finish_output+0x447/0xab0 net/ipv6/ip6_output.c:128 ip6_finish_output+0x34/0x1f0 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip6_output+0x1db/0x520 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] ip6_local_out+0xaf/0x1a0 net/ipv6/output_core.c:179 ip6_send_skb+0xb7/0x340 net/ipv6/ip6_output.c:1867 ip6_push_pending_frames+0xbd/0xe0 net/ipv6/ip6_output.c:1887 rawv6_push_pending_frames net/ipv6/raw.c:613 [inline] rawv6_sendmsg+0x2add/0x38f0 net/ipv6/raw.c:956 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x331/0x810 net/socket.c:2353 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 __sys_sendmmsg+0x195/0x480 net/socket.c:2497 __do_sys_sendmmsg net/socket.c:2526 [inline] __se_sys_sendmmsg net/socket.c:2523 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2523 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd0367a3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00000000000279c0 RCX: 000000000045d5b9 RDX: 00000000000002e9 RSI: 0000000020000480 RDI: 0000000000000006 RBP: 000000000118d208 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000005a0 R11: 0000000000000246 R12: 000000000118d1cc R13: 00007ffced191d2f R14: 00007fd0367a49c0 R15: 000000000118d1cc Allocated by task 29534: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 slab_post_alloc_hook mm/slab.h:518 [inline] slab_alloc mm/slab.c:3312 [inline] kmem_cache_alloc+0x13a/0x3a0 mm/slab.c:3482 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:1391 sock_create net/socket.c:1478 [inline] __sys_socket+0xef/0x200 net/socket.c:1520 __do_sys_socket net/socket.c:1529 [inline] __se_sys_socket net/socket.c:1527 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1527 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 16: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422 __cache_free mm/slab.c:3418 [inline] kmem_cache_free.part.0+0x74/0x1e0 mm/slab.c:3693 i_callback+0x3f/0x70 fs/inode.c:221 rcu_do_batch kernel/rcu/tree.c:2428 [inline] rcu_core+0x5ca/0x1130 kernel/rcu/tree.c:2656 __do_softirq+0x1f7/0xa91 kernel/softirq.c:298 Last call_rcu(): kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_record_aux_stack+0x82/0xb0 mm/kasan/generic.c:346 __call_rcu kernel/rcu/tree.c:2894 [inline] call_rcu+0x15e/0x7b0 kernel/rcu/tree.c:2968 destroy_inode+0x129/0x1b0 fs/inode.c:287 iput_final fs/inode.c:1652 [inline] iput.part.0+0x424/0x850 fs/inode.c:1678 iput+0x58/0x70 fs/inode.c:1668 dentry_unlink_inode+0x2b1/0x3d0 fs/dcache.c:374 __dentry_kill+0x3c0/0x640 fs/dcache.c:579 dentry_kill fs/dcache.c:705 [inline] dput+0x725/0xbc0 fs/dcache.c:878 __fput+0x3ab/0x920 fs/file_table.c:294 task_work_run+0xdd/0x190 kernel/task_work.c:141 get_signal+0xd89/0x1f00 kernel/signal.c:2561 arch_do_signal+0x82/0x2520 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:136 [inline] exit_to_user_mode_prepare+0x1ae/0x200 kernel/entry/common.c:167 syscall_exit_to_user_mode+0x7e/0x2e0 kernel/entry/common.c:242 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Second to last call_rcu(): kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_record_aux_stack+0x82/0xb0 mm/kasan/generic.c:346 __call_rcu kernel/rcu/tree.c:2894 [inline] call_rcu+0x15e/0x7b0 kernel/rcu/tree.c:2968 destroy_inode+0x129/0x1b0 fs/inode.c:287 iput_final fs/inode.c:1652 [inline] iput.part.0+0x424/0x850 fs/inode.c:1678 iput+0x58/0x70 fs/inode.c:1668 dentry_unlink_inode+0x2b1/0x3d0 fs/dcache.c:374 __dentry_kill+0x3c0/0x640 fs/dcache.c:579 dentry_kill fs/dcache.c:705 [inline] dput+0x725/0xbc0 fs/dcache.c:878 __fput+0x3ab/0x920 fs/file_table.c:294 task_work_run+0xdd/0x190 kernel/task_work.c:141 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:140 [inline] exit_to_user_mode_prepare+0x1e1/0x200 kernel/entry/common.c:167 syscall_exit_to_user_mode+0x7e/0x2e0 kernel/entry/common.c:242 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88804d7d9540 which belongs to the cache sock_inode_cache of size 1216 The buggy address is located 128 bytes inside of 1216-byte region [ffff88804d7d9540, ffff88804d7d9a00) The buggy address belongs to the page: page:0000000063511ca7 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88804d7d9ffd pfn:0x4d7d9 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000135f608 ffffea0001314808 ffff8880a9050b00 raw: ffff88804d7d9ffd ffff88804d7d9000 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804d7d9480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88804d7d9500: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff88804d7d9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804d7d9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804d7d9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================