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BUG: KASAN: use-after-free in mon_bin_vma_fault+0x378/0x400 drivers/usb/mon/mon_bin.c:1238
Read of size 8 at addr ffff8801cb81a0c0 by task syz-executor6/8066

CPU: 1 PID: 8066 Comm: syz-executor6 Not tainted 4.15.0-rc6-mm1+ #52
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+0x194/0x257 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+0x378/0x400 drivers/usb/mon/mon_bin.c:1238
 __do_fault+0xeb/0x30f 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+0x1d8f/0x3ce0 mm/memory.c:4089
 handle_mm_fault+0x38f/0x930 mm/memory.c:4126
 faultin_page mm/gup.c:502 [inline]
 __get_user_pages+0x50c/0x15f0 mm/gup.c:699
 populate_vma_page_range+0x20e/0x2f0 mm/gup.c:1200
 __mm_populate+0x23a/0x450 mm/gup.c:1250
 mm_populate include/linux/mm.h:2233 [inline]
 vm_mmap_pgoff+0x241/0x280 mm/util.c:338
 SYSC_mmap_pgoff mm/mmap.c:1544 [inline]
 SyS_mmap_pgoff+0x462/0x5f0 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:00007f1067b0dc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000001000004 RSI: 0000000000004000 RDI: 0000000020ac6000
RBP: 00000000000003eb R08: 0000000000000016 R09: 0000000000000000
R10: 0000000000008011 R11: 0000000000000212 R12: 00000000006f3ea8
R13: 00000000ffffffff R14: 00007f1067b0e6d4 R15: 0000000000000000

Allocated by task 8066:
 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
 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3607
 kmalloc include/linux/slab.h:515 [inline]
 kzalloc include/linux/slab.h:704 [inline]
 mon_bin_open+0x1ae/0x4a0 drivers/usb/mon/mon_bin.c:703
 chrdev_open+0x257/0x730 fs/char_dev.c:417
 do_dentry_open+0x667/0xd40 fs/open.c:752
 vfs_open+0x107/0x220 fs/open.c:866
 do_last fs/namei.c:3397 [inline]
 path_openat+0x1151/0x3530 fs/namei.c:3537
 do_filp_open+0x25b/0x3b0 fs/namei.c:3572
 do_sys_open+0x502/0x6d0 fs/open.c:1059
 SYSC_open fs/open.c:1077 [inline]
 SyS_open+0x2d/0x40 fs/open.c:1072
 entry_SYSCALL_64_fastpath+0x23/0x9a

Freed by task 8077:
 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+0x68d/0xd40 drivers/usb/mon/mon_bin.c:1040
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1520 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 ffff8801cb81a0c0
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 0 bytes inside of
 2048-byte region [ffff8801cb81a0c0, ffff8801cb81a8c0)
The buggy address belongs to the page:
page:ffffea00072e0680 count:1 mapcount:0 mapping:ffff8801cb81a0c0 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801cb81a0c0 0000000000000000 0000000100000003
raw: ffffea0007341720 ffffea000731ffa0 ffff8801dac00c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cb819f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801cb81a000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801cb81a080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                           ^
 ffff8801cb81a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801cb81a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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