================================================================== 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 ffff8880a4ea15c0 by task syz-executor515/6987 CPU: 0 PID: 6987 Comm: syz-executor515 Not tainted 5.8.0-rc5-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+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] kfree_skb.part.0+0x89/0x350 net/core/skbuff.c:696 kfree_skb+0x7d/0x100 include/linux/refcount.h:270 skb_queue_purge+0x14/0x30 net/core/skbuff.c:3077 qrtr_tun_release+0x40/0x60 net/qrtr/tun.c:118 __fput+0x33c/0x880 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:135 exit_task_work include/linux/task_work.h:25 [inline] do_exit+0xb72/0x2a40 kernel/exit.c:805 do_group_exit+0x125/0x310 kernel/exit.c:903 get_signal+0x40b/0x1ee0 kernel/signal.c:2743 do_signal+0x82/0x2520 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:235 [inline] __prepare_exit_to_usermode+0x156/0x1f0 arch/x86/entry/common.c:269 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x446959 Code: Bad RIP value. RSP: 002b:00007f43b3256db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000006dbc38 RCX: 0000000000446959 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc38 RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c R13: 00007ffce6c8421f R14: 00007f43b32579c0 R15: 0000000000000001 Allocated by task 6987: 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 ffff8880a4ea1540 which belongs to the cache sock_inode_cache of size 1216 The buggy address is located 128 bytes inside of 1216-byte region [ffff8880a4ea1540, ffff8880a4ea1a00) The buggy address belongs to the page: page:ffffea000293a840 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a4ea1ffd flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00022d1d48 ffffea0002236608 ffff8880a974bc40 raw: ffff8880a4ea1ffd ffff8880a4ea1000 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a4ea1480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880a4ea1500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff8880a4ea1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a4ea1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a4ea1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================