ldusb 2-1:0.248: Read buffer overflow, -131384023154688 bytes dropped
usercopy: Kernel memory exposure attempt detected from SLUB object 'kmalloc-2k' (offset 8, size 4096)!
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kernel BUG at mm/usercopy.c:99!
invalid opcode: 0000 [#1] SMP KASAN
CPU: 1 PID: 7184 Comm: syz-executor.4 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:usercopy_abort+0xb9/0xbb mm/usercopy.c:99
Code: e8 32 51 d6 ff 49 89 d9 4d 89 e8 4c 89 e1 41 56 48 89 ee 48 c7 c7 40 d9 cd 85 ff 74 24 08 41 57 48 8b 54 24 20 e8 46 e3 c0 ff <0f> 0b e8 06 51 d6 ff e8 31 8b fd ff 8b 54 24 04 49 89 d8 4c 89 e1
RSP: 0018:ffff8881c672fc50 EFLAGS: 00010286
RAX: 0000000000000066 RBX: ffffffff86a564ec RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8128bcbd RDI: ffffed1038ce5f7c
RBP: ffffffff85cdd820 R08: 0000000000000066 R09: fffffbfff11b23be
R10: fffffbfff11b23bd R11: ffffffff88d91def R12: ffffffff86a5a2f0
R13: ffffffff85cdd6e0 R14: 0000000000001000 R15: ffffffff85cdd6a0
FS:  00007f785c7f8700(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004dcaa0 CR3: 00000001d0be8000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __check_heap_object+0xdd/0x110 mm/slub.c:3924
 check_heap_object mm/usercopy.c:240 [inline]
 __check_object_size mm/usercopy.c:286 [inline]
 __check_object_size+0x327/0x39a mm/usercopy.c:256
 check_object_size include/linux/thread_info.h:119 [inline]
 check_copy_size include/linux/thread_info.h:150 [inline]
 copy_to_user include/linux/uaccess.h:151 [inline]
 ld_usb_read+0x31a/0x760 drivers/usb/misc/ldusb.c:492
 __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: 0033:0x459a59
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:00007f785c7f7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a59
RDX: 0000000000001000 RSI: 0000000020002a40 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f785c7f86d4
R13: 00000000004c70f9 R14: 00000000004dcaa0 R15: 00000000ffffffff
Modules linked in:
---[ end trace 70f76d9e71fef5fc ]---
RIP: 0010:usercopy_abort+0xb9/0xbb mm/usercopy.c:99
Code: e8 32 51 d6 ff 49 89 d9 4d 89 e8 4c 89 e1 41 56 48 89 ee 48 c7 c7 40 d9 cd 85 ff 74 24 08 41 57 48 8b 54 24 20 e8 46 e3 c0 ff <0f> 0b e8 06 51 d6 ff e8 31 8b fd ff 8b 54 24 04 49 89 d8 4c 89 e1
RSP: 0018:ffff8881c672fc50 EFLAGS: 00010286
RAX: 0000000000000066 RBX: ffffffff86a564ec RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8128bcbd RDI: ffffed1038ce5f7c
RBP: ffffffff85cdd820 R08: 0000000000000066 R09: fffffbfff11b23be
R10: fffffbfff11b23bd R11: ffffffff88d91def R12: ffffffff86a5a2f0
R13: ffffffff85cdd6e0 R14: 0000000000001000 R15: ffffffff85cdd6a0
FS:  00007f785c7f8700(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004dcaa0 CR3: 00000001d0be8000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400