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usercopy: kernel memory overwrite attempt detected to 00000000a600020f (kmalloc-1024) (984 bytes)
------------[ cut here ]------------
kernel BUG at mm/usercopy.c:72!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 15591 Comm: syz-executor2 Not tainted 4.15.0-rc2+ #141
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: 000000004562730d task.stack: 00000000e16d7621
RIP: 0010:report_usercopy mm/usercopy.c:64 [inline]
RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:264
RSP: 0018:ffff88019e2d7c60 EFLAGS: 00010286
RAX: 0000000000000061 RBX: ffffffff85328580 RCX: 0000000000000000
RDX: 0000000000000061 RSI: ffffc90002f3d000 RDI: ffffed0033c5af80
RBP: ffff88019e2d7d50 R08: 1ffffffff0d2ab1b R09: 0000000000000000
R10: 00000000aba25679 R11: 0000000000000000 R12: ffffffff85328540
R13: ffff8801d30876d0 R14: 00000000000003d8 R15: ffffea00074c2180
FS:  00007f79584cd700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000232fcd8 CR3: 00000001d30c2000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
netlink: 6 bytes leftover after parsing attributes in process `syz-executor2'.
Call Trace:
 check_object_size include/linux/thread_info.h:112 [inline]
 check_copy_size include/linux/thread_info.h:143 [inline]
 copy_from_user include/linux/uaccess.h:146 [inline]
 memdup_user+0x46/0x90 mm/util.c:168
 ioctl_file_dedupe_range fs/ioctl.c:597 [inline]
 do_vfs_ioctl+0x53e/0x1530 fs/ioctl.c:680
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x4529d9
RSP: 002b:00007f79584ccc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 00000000004529d9
RDX: 00000000206a9fe0 RSI: 00000000c0189436 RDI: 0000000000000016
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a6f7ff R14: 00007f79584cd9c0 R15: 0000000000000000
Code: 48 0f 44 da e8 c0 6f c2 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 40 86 32 85 49 89 c0 e8 b3 2d ac ff <0f> 0b 48 c7 c0 00 84 32 85 eb 96 48 c7 c0 40 84 32 85 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff88019e2d7c60
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff88019e2d7c60
---[ end trace d391f98d628972bc ]---
netlink: 6 bytes leftover after parsing attributes in process `syz-executor2'.
netlink: 7 bytes leftover after parsing attributes in process `syz-executor3'.
PF_BRIDGE: br_mdb_parse() with unknown ifindex
netlink: 7 bytes leftover after parsing attributes in process `syz-executor3'.
PF_BRIDGE: br_mdb_parse() with unknown ifindex