EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue netlink: 48 bytes leftover after parsing attributes in process `syz-executor.2'. ================================================================== BUG: KASAN: use-after-free in __list_add include/linux/list.h:73 [inline] BUG: KASAN: use-after-free in list_add_tail include/linux/list.h:100 [inline] BUG: KASAN: use-after-free in __io_cqring_fill_event+0x968/0x980 fs/io_uring.c:1751 Write of size 8 at addr ffff88804e6fc288 by task syz-executor.6/10944 CPU: 1 PID: 10944 Comm: syz-executor.6 Not tainted 5.10.45 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 print_address_description.constprop.0+0x1c/0x210 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x37/0x7c mm/kasan/report.c:562 __list_add include/linux/list.h:73 [inline] list_add_tail include/linux/list.h:100 [inline] __io_cqring_fill_event+0x968/0x980 fs/io_uring.c:1751 io_cqring_add_event fs/io_uring.c:1766 [inline] __io_req_complete fs/io_uring.c:1810 [inline] __io_req_complete fs/io_uring.c:1806 [inline] io_req_complete fs/io_uring.c:1824 [inline] io_queue_sqe+0xa96/0x1020 fs/io_uring.c:6395 io_submit_sqe fs/io_uring.c:6479 [inline] io_submit_sqes+0x130d/0x2300 fs/io_uring.c:6707 __do_sys_io_uring_enter+0x1092/0x1910 fs/io_uring.c:9100 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x466609 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0ec09da188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609 RDX: 0000000000000000 RSI: 00000000000058ab RDI: 0000000000000003 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffea7f7d93f R14: 00007f0ec09da300 R15: 0000000000022000 Allocated by task 10944: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461 slab_post_alloc_hook mm/slab.h:533 [inline] kmem_cache_alloc_bulk+0x147/0x320 mm/slub.c:3333 io_alloc_req fs/io_uring.c:1853 [inline] io_submit_sqes+0x11c2/0x2300 fs/io_uring.c:6687 __do_sys_io_uring_enter+0x1092/0x1910 fs/io_uring.c:9100 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 10944: 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+0x110/0x150 mm/kasan/common.c:422 slab_free_hook mm/slub.c:1541 [inline] slab_free_freelist_hook+0x64/0x150 mm/slub.c:1574 slab_free mm/slub.c:3139 [inline] kmem_cache_free+0x97/0x2f0 mm/slub.c:3155 __io_free_req+0x216/0x310 fs/io_uring.c:1908 io_free_req fs/io_uring.c:2132 [inline] io_double_put_req fs/io_uring.c:2272 [inline] io_put_req+0xab/0x100 fs/io_uring.c:2268 __io_queue_sqe+0x1df/0xd00 fs/io_uring.c:6365 io_queue_sqe+0x5bc/0x1020 fs/io_uring.c:6410 io_queue_link_head fs/io_uring.c:6421 [inline] io_submit_sqe fs/io_uring.c:6462 [inline] io_submit_sqes+0x176b/0x2300 fs/io_uring.c:6707 __do_sys_io_uring_enter+0x1092/0x1910 fs/io_uring.c:9100 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88804e6fc280 which belongs to the cache io_kiocb of size 216 The buggy address is located 8 bytes inside of 216-byte region [ffff88804e6fc280, ffff88804e6fc358) The buggy address belongs to the page: page:00000000f42a58e4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4e6fc flags: 0x100000000000200(slab) raw: 0100000000000200 ffffea000139bec0 0000000d0000000d ffff88800c0e0780 raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804e6fc180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804e6fc200: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88804e6fc280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804e6fc300: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff88804e6fc380: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ================================================================== netlink: 48 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 48 bytes leftover after parsing attributes in process `syz-executor.7'. netlink: 48 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 48 bytes leftover after parsing attributes in process `syz-executor.4'. ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 10944 at lib/refcount.c:28 refcount_warn_saturate+0x103/0x1f0 lib/refcount.c:28 Modules linked in: CPU: 1 PID: 10944 Comm: syz-executor.6 Tainted: G B 5.10.45 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:refcount_warn_saturate+0x103/0x1f0 lib/refcount.c:28 Code: 1d f4 a4 54 03 31 ff 89 de e8 f9 73 51 ff 84 db 75 a3 e8 c0 7a 51 ff 48 c7 c7 20 34 3b 84 c6 05 d4 a4 54 03 01 e8 0d 97 c8 01 <0f> 0b eb 87 e8 a4 7a 51 ff 0f b6 1d bd a4 54 03 31 ff 89 de e8 c4 RSP: 0018:ffff88805086f938 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff8880518fcbc0 RSI: ffffffff812943f3 RDI: ffffed100a10df19 RBP: ffff88804e6fc2dc R08: 0000000000000001 R09: ffff88806cf2facf R10: 0000000000000000 R11: 0000000000000001 R12: ffff88804e6fc2dc R13: ffff88804ad4f000 R14: dffffc0000000000 R15: ffff88805086fa00 FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000004dfe2000 CR4: 0000000000350ee0 Call Trace: __refcount_sub_and_test include/linux/refcount.h:283 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] io_put_req+0xc6/0x100 fs/io_uring.c:2220 __io_cqring_overflow_flush+0x750/0xac0 fs/io_uring.c:1694 io_ring_ctx_wait_and_kill+0xe9/0x530 fs/io_uring.c:8557 io_uring_release+0x3e/0x50 fs/io_uring.c:8593 __fput+0x285/0x980 fs/file_table.c:281 task_work_run+0xe2/0x1a0 kernel/task_work.c:151 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xc1b/0x2780 kernel/exit.c:811 do_group_exit+0x125/0x310 kernel/exit.c:908 get_signal+0x469/0x2200 kernel/signal.c:2758 arch_do_signal+0x88/0x1a90 arch/x86/kernel/signal.c:789 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0xf7/0x160 kernel/entry/common.c:191 syscall_exit_to_user_mode+0x38/0x230 kernel/entry/common.c:266 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x466609 Code: Unable to access opcode bytes at RIP 0x4665df. RSP: 002b:00007f0ec09da218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000056bf88 RCX: 0000000000466609 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf88 RBP: 000000000056bf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf8c R13: 00007ffea7f7d93f R14: 00007f0ec09da300 R15: 0000000000022000 irq event stamp: 748 hardirqs last enabled at (747): [] quarantine_put+0x87/0x1a0 mm/kasan/quarantine.c:217 hardirqs last disabled at (748): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (748): [] _raw_spin_lock_irqsave+0x4b/0x50 kernel/locking/spinlock.c:159 softirqs last enabled at (424): [] read_pnet include/net/net_namespace.h:330 [inline] softirqs last enabled at (424): [] sock_net include/net/sock.h:2541 [inline] softirqs last enabled at (424): [] unix_create1+0x470/0x540 net/unix/af_unix.c:814 softirqs last disabled at (422): [] init_waitqueue_func_entry include/linux/wait.h:93 [inline] softirqs last disabled at (422): [] unix_create1+0x3b6/0x540 net/unix/af_unix.c:806 ---[ end trace ddf6a69b41536fdf ]---