KASAN: use-after-free Read in vhost_transport_cancel_pkt

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Hello,

syzbot found the following crash on:

HEAD commit:    4ca719a338d5 Merge branch 'linus' of git://git.kernel.org/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16861f99400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5fa12be50bca08d8
dashboard link: https://syzkaller.appspot.com/bug?extid=e3e074963495f92a89ed
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
userspace arch: i386

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+e3e074963495f92a89ed@xxxxxxxxxxxxxxxxxxxxxxxxx

QAT: Invalid ioctl
==================================================================
BUG: KASAN: use-after-free in perf_trace_lock_acquire+0x66b/0x800 include/trace/events/lock.h:13
Read of size 8 at addr ffff880196f584e8 by task syz-executor1/30556

CPU: 1 PID: 30556 Comm: syz-executor1 Not tainted 4.19.0-rc4+ #148
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
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 perf_trace_lock_acquire+0x66b/0x800 include/trace/events/lock.h:13
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x385/0x520 kernel/locking/lockdep.c:3899
 __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_cancel_pkt+0x15e/0x910 drivers/vhost/vsock.c:244
 vsock_transport_cancel_pkt net/vmw_vsock/af_vsock.c:1114 [inline]
 vsock_stream_connect+0x903/0xe40 net/vmw_vsock/af_vsock.c:1241
 __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: 0023:0xf7f8fca9
Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 0c 24 c3 8b 1c 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:00000000f5f280cc EFLAGS: 00000296 ORIG_RAX: 000000000000016a
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 0000000020000080
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 30547:
 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
QAT: Invalid ioctl
 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_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 30546:
 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_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 ffff880196f4f7c0
 which belongs to the cache kmalloc-65536 of size 65536
The buggy address is located 36136 bytes inside of
 65536-byte region [ffff880196f4f7c0, ffff880196f5f7c0)
The buggy address belongs to the page:
page:ffffea00065bd000 count:1 mapcount:0 mapping:ffff8801da802500 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffffea00071cf008 ffffea0007199808 ffff8801da802500
raw: 0000000000000000 ffff880196f4f7c0 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff880196f58380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff880196f58400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff880196f58480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff880196f58500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff880196f58580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
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