================================================================== BUG: KASAN: use-after-free in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] BUG: KASAN: use-after-free in virt_spin_lock arch/x86/include/asm/qspinlock.h:65 [inline] BUG: KASAN: use-after-free in native_queued_spin_lock_slowpath+0x183/0x1120 kernel/locking/qspinlock.c:305 Read of size 4 at addr ffff8801a8fac8b8 by task syz-executor1/9135 CPU: 0 PID: 9135 Comm: syz-executor1 Not tainted 4.19.0-rc5+ #34 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+0x1c4/0x2b4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] virt_spin_lock arch/x86/include/asm/qspinlock.h:65 [inline] native_queued_spin_lock_slowpath+0x183/0x1120 kernel/locking/qspinlock.c:305 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:679 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:32 [inline] queued_spin_lock include/asm-generic/qspinlock.h:88 [inline] do_raw_spin_lock+0x1a7/0x200 kernel/locking/spinlock_debug.c:113 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline] _raw_spin_lock_bh+0x39/0x40 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] __x64_sys_connect+0x73/0xb0 net/socket.c:1672 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 Code: 1d 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f6b59decc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579 RDX: 0000000000000010 RSI: 0000000020000200 RDI: 0000000000000008 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6b59ded6d4 R13: 00000000004bdb1a R14: 00000000004cc658 R15: 00000000ffffffff Allocated by task 9106: 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:3682 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:555 [inline] kvmalloc_node+0xb9/0xf0 mm/util.c:423 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+0x12bf/0x5160 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 __do_sys_openat fs/open.c:1090 [inline] __se_sys_openat fs/open.c:1084 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1084 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9105: 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:3813 kvfree+0x61/0x70 mm/util.c:452 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:193 [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_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801a8fa3bc0 which belongs to the cache kmalloc-65536 of size 65536 The buggy address is located 36088 bytes inside of 65536-byte region [ffff8801a8fa3bc0, ffff8801a8fb3bc0) The buggy address belongs to the page: page:ffffea0006a3e800 count:1 mapcount:0 mapping:ffff8801da802500 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0006a39808 ffffea0006a36808 ffff8801da802500 raw: 0000000000000000 ffff8801a8fa3bc0 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801a8fac780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801a8fac800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801a8fac880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801a8fac900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801a8fac980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================