================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x36d9/0x4c20 kernel/locking/lockdep.c:3218 Read of size 8 at addr ffff8881c16ce090 by task syz-executor4/24527 CPU: 1 PID: 24527 Comm: syz-executor4 Not tainted 4.20.0-rc5+ #265 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+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __lock_acquire+0x36d9/0x4c20 kernel/locking/lockdep.c:3218 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:168 spin_lock_bh include/linux/spinlock.h:334 [inline] vhost_transport_send_pkt+0x12e/0x380 drivers/vhost/vsock.c:223 virtio_transport_send_pkt_info+0x31d/0x460 net/vmw_vsock/virtio_transport_common.c:190 virtio_transport_connect+0x17c/0x220 net/vmw_vsock/virtio_transport_common.c:588 vsock_stream_connect+0x4ed/0xe40 net/vmw_vsock/af_vsock.c:1200 __sys_connect+0x37d/0x4c0 net/socket.c:1664 __do_sys_connect net/socket.c:1675 [inline] __se_sys_connect net/socket.c:1672 [inline] __ia32_sys_connect+0x72/0xb0 net/socket.c:1672 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fcaa29 Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5fc60cc EFLAGS: 00000296 ORIG_RAX: 000000000000016a RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000020000200 RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 24527: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3684 [inline] __kmalloc_node+0x50/0x70 mm/slab.c:3691 kmalloc_node include/linux/slab.h:589 [inline] kvmalloc_node+0xb9/0xf0 mm/util.c:416 kvmalloc include/linux/mm.h:577 [inline] vhost_vsock_dev_open+0xa2/0x5a0 drivers/vhost/vsock.c:511 misc_open+0x3ca/0x560 drivers/char/misc.c:141 chrdev_open+0x25a/0x710 fs/char_dev.c:417 do_dentry_open+0x499/0x1250 fs/open.c:771 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x12bc/0x5150 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 __do_compat_sys_openat fs/open.c:1109 [inline] __se_compat_sys_openat fs/open.c:1107 [inline] __ia32_compat_sys_openat+0x98/0xf0 fs/open.c:1107 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 Freed by task 24526: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 kvfree+0x61/0x70 mm/util.c:445 vhost_vsock_free drivers/vhost/vsock.c:499 [inline] vhost_vsock_dev_release+0x4f4/0x720 drivers/vhost/vsock.c:604 __fput+0x385/0xa30 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_32_irqs_on arch/x86/entry/common.c:341 [inline] do_fast_syscall_32+0xcd5/0xfb2 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 The buggy address belongs to the object at ffff8881c16c5380 which belongs to the cache kmalloc-64k of size 65536 The buggy address is located 36112 bytes inside of 65536-byte region [ffff8881c16c5380, ffff8881c16d5380) The buggy address belongs to the page: page:ffffea000705b000 count:1 mapcount:0 mapping:ffff8881da802500 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000010200(slab|head) raw: 02fffc0000010200 ffffea0006e36008 ffffea0006e2e008 ffff8881da802500 raw: 0000000000000000 ffff8881c16c5380 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881c16cdf80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881c16ce000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb kobject: 'loop3' (00000000f9290edd): fill_kobj_path: path = '/devices/virtual/block/loop3' >ffff8881c16ce080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881c16ce100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881c16ce180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================