usercopy: kernel memory exposure attempt detected from 00000000ef2d88fa (kmalloc-1024) (1024 bytes)
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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: 1790 Comm: syz-executor5 Not tainted 4.15.0-rc5+ #171
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:report_usercopy mm/usercopy.c:64 [inline]
RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:264
RSP: 0018:ffff8801bcab7858 EFLAGS: 00010286
RAX: 0000000000000063 RBX: ffffffff8592bbe0 RCX: 0000000000000000
RDX: 0000000000000063 RSI: ffffc90003a36000 RDI: ffffed0037956eff
RBP: ffff8801bcab7948 R08: 1ffff10037956e8d R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8592bba0
R13: ffff8801bcfcae10 R14: 0000000000000400 R15: ffffea0006f3f280
FS:  00007f6d126aa700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000071c000 CR3: 00000001d53e4004 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 check_object_size include/linux/thread_info.h:112 [inline]
 check_copy_size include/linux/thread_info.h:143 [inline]
 copy_to_user include/linux/uaccess.h:154 [inline]
 old_dev_ioctl.isra.1+0x105b/0x1fa0 net/bridge/br_ioctl.c:178
 br_dev_ioctl+0x44/0xc0 net/bridge/br_ioctl.c:392
 dev_ifsioc+0x333/0x9b0 net/core/dev_ioctl.c:354
 dev_ioctl+0xa73/0xfb0 net/core/dev_ioctl.c:589
 sock_ioctl+0x1da/0x440 net/socket.c:990
 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
RIP: 0033:0x452ac9
RSP: 002b:00007f6d126a9c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6d126aa700 RCX: 0000000000452ac9
RDX: 0000000020853000 RSI: 00000000000089f0 RDI: 0000000000000013
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a2f7ef R14: 00007f6d126aa9c0 R15: 0000000000000000
Code: 48 0f 44 da e8 70 5b c0 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 20 bc 92 85 49 89 c0 e8 e6 10 aa ff <0f> 0b 48 c7 c0 e0 b9 92 85 eb 96 48 c7 c0 20 ba 92 85 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff8801bcab7858
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff8801bcab7858
---[ end trace 78ceff5171e1d2d6 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..