binder: BINDER_SET_CONTEXT_MGR already set
binder: 5537:5546 ioctl 40046207 0 returned -16
binder_alloc: 5537: binder_alloc_buf, no vma
binder: 5537:5546 transaction failed 29189/-3, size 40-8 line 2960
==================================================================
BUG: KASAN: use-after-free in mon_bin_vma_fault+0x247/0x250 drivers/usb/mon/mon_bin.c:1238
Read of size 8 at addr ffff8801c30ce280 by task syz-executor2/5566

CPU: 0 PID: 5566 Comm: syz-executor2 Not tainted 4.15.0-rc6-next-20180105+ #89
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x137/0x198 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report+0x23b/0x360 mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 mon_bin_vma_fault+0x247/0x250 drivers/usb/mon/mon_bin.c:1238
 __do_fault+0x8a/0x1d0 mm/memory.c:3224
 do_read_fault mm/memory.c:3634 [inline]
 do_fault mm/memory.c:3734 [inline]
 handle_pte_fault mm/memory.c:3965 [inline]
 __handle_mm_fault+0x1c96/0x3210 mm/memory.c:4089
 handle_mm_fault+0x305/0x840 mm/memory.c:4126
 faultin_page mm/gup.c:502 [inline]
 __get_user_pages+0x37e/0x1140 mm/gup.c:699
 populate_vma_page_range+0x18e/0x230 mm/gup.c:1200
 __mm_populate+0x204/0x350 mm/gup.c:1250
 mm_populate include/linux/mm.h:2233 [inline]
 vm_mmap_pgoff+0x1e1/0x1f0 mm/util.c:338
 SYSC_mmap_pgoff mm/mmap.c:1544 [inline]
 SyS_mmap_pgoff+0x423/0x580 mm/mmap.c:1502
 SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007f65f4f52c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000001000004 RSI: 0000000000004000 RDI: 0000000020ac6000
RBP: 000000000000056d R08: 0000000000000013 R09: 0000000000000000
R10: 0000000000008011 R11: 0000000000000212 R12: 00000000006f62d8
R13: 00000000ffffffff R14: 00007f65f4f536d4 R15: 0000000000000000

Allocated by task 5566:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552
 __do_kmalloc mm/slab.c:3705 [inline]
 __kmalloc+0x162/0x760 mm/slab.c:3714
 kmalloc include/linux/slab.h:520 [inline]
 kzalloc include/linux/slab.h:704 [inline]
 mon_bin_ioctl+0x6b3/0xb20 drivers/usb/mon/mon_bin.c:1025
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x190/0xfe0 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x23/0x9a

Freed by task 5570:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527
 __cache_free mm/slab.c:3485 [inline]
 kfree+0xd9/0x260 mm/slab.c:3800
 mon_bin_ioctl+0x7e9/0xb20 drivers/usb/mon/mon_bin.c:1040
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x190/0xfe0 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x23/0x9a

The buggy address belongs to the object at ffff8801c30ce280
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 0 bytes inside of
 256-byte region [ffff8801c30ce280, ffff8801c30ce380)
The buggy address belongs to the page:
page:ffffea00070c3380 count:1 mapcount:0 mapping:ffff8801c30ce000 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c30ce000 0000000000000000 000000010000000c
raw: ffffea00070d08e0 ffffea00070c39a0 ffff8801db0007c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c30ce180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c30ce200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8801c30ce280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8801c30ce300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c30ce380: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
==================================================================