ldusb 4-1:0.28: Read buffer overflow, -8516554968584345071 bytes dropped
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BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x124/0x150 lib/usercopy.c:27
Read of size 210687470 at addr ffff8881b00202b4 by task syz-executor.3/4265

CPU: 1 PID: 4265 Comm: syz-executor.3 Not tainted 5.3.0+ #0
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+0xca/0x13e lib/dump_stack.c:113
 print_address_description.constprop.0+0x36/0x50 mm/kasan/report.c:374
 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:506
 kasan_report+0xe/0x12 mm/kasan/common.c:634
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x128/0x190 mm/kasan/generic.c:192
 _copy_to_user+0x124/0x150 lib/usercopy.c:27
 copy_to_user include/linux/uaccess.h:152 [inline]
 ld_usb_read+0x31a/0x780 drivers/usb/misc/ldusb.c:495
 __vfs_read+0x76/0x100 fs/read_write.c:425
 vfs_read+0x1ea/0x430 fs/read_write.c:461
 ksys_read+0x1e8/0x250 fs/read_write.c:587
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a29
Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f283fbb7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a29
RDX: 000000000c8ed5ee RSI: 00000000200000c0 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f283fbb86d4
R13: 00000000004c6e7d R14: 00000000004dc390 R15: 00000000ffffffff

The buggy address belongs to the page:
page:ffffea0006c00800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0
flags: 0x200000000010000(head)
raw: 0200000000010000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881b0035500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881b0035580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881b0035600: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
                   ^
 ffff8881b0035680: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 ffff8881b0035700: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
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