Hi! I've got the following report while fuzzing the kernel with syzkaller. On commit e19b205be43d11bff638cad4487008c48d21c103 (4.14-rc2). It seems that there's no check on the actual number of endpoints. usb 1-1: New USB device strings: Mfr=212, Product=0, SerialNumber=6 usb 1-1: Manufacturer: a usb 1-1: SerialNumber: a gadgetfs: configuration #3 flexcop_usb: running at FULL speed. gadgetfs: disconnected flexcop_usb: error while reading dword from 161 (516). flexcop_usb: error while writing dword from 33 (516). flexcop_usb: error while writing dword from 33 (516). flexcop_usb: error while reading dword from 161 (516). flexcop_usb: error while reading dword from 247 (1820). flexcop_usb: error while writing dword from 119 (1820). flexcop_usb: error while reading dword from 176 (768). flexcop_usb: error while reading dword from 162 (520). flexcop_usb: error while writing dword from 48 (768). flexcop_usb: error while writing dword from 34 (520). flexcop_usb: error while reading dword from 176 (768). flexcop_usb: error while reading dword from 162 (520). flexcop_usb: error while writing dword from 48 (768). flexcop_usb: error while writing dword from 34 (520). flexcop_usb: error while reading dword from 177 (772). flexcop_usb: error while reading dword from 162 (520). flexcop_usb: error while writing dword from 49 (772). flexcop_usb: error while writing dword from 34 (520). flexcop_usb: error while reading dword from 177 (772). flexcop_usb: error while reading dword from 162 (520). flexcop_usb: error while writing dword from 49 (772). flexcop_usb: error while writing dword from 34 (520). flexcop_usb: error while reading dword from 178 (776). flexcop_usb: error while reading dword from 162 (520). flexcop_usb: error while writing dword from 50 (776). flexcop_usb: error while writing dword from 34 (520). flexcop_usb: error while reading dword from 178 (776). flexcop_usb: error while reading dword from 162 (520). flexcop_usb: error while writing dword from 50 (776). flexcop_usb: error while writing dword from 34 (520). flexcop_usb: error while writing dword from 51 (780). flexcop_usb: error while reading dword from 162 (520). flexcop_usb: error while writing dword from 34 (520). flexcop_usb: error while reading dword from 178 (776). flexcop_usb: error while writing dword from 50 (776). flexcop_usb: error while reading dword from 162 (520). flexcop_usb: error while writing dword from 34 (520). flexcop_usb: error while reading dword from 162 (520). flexcop_usb: error while writing dword from 34 (520). dvbdev: DVB: registering new adapter (FlexCop Digital TV device) b2c2-flexcop: reading of MAC address failed. CX24123: wrong demod revision: 0 nxt200x: Unknown/Unsupported NXT chip: 00 00 00 00 00 tuner-simple 0-0061: creating new instance tuner-simple 0-0061: type set to 64 (LG TDVS-H06xF) b2c2-flexcop: found 'LG Electronics LGDT3303 VSB/QAM Frontend' . usb 1-1: DVB: registering adapter 0 frontend 0 (LG Electronics LGDT3303 VSB/QAM Frontend)... b2c2-flexcop: initialization of 'Air2PC/AirStar 2 ATSC 3rd generation (HD5000)' at the 'USB' bus controlled by a 'FlexCopIII' complete kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 0 PID: 24 Comm: kworker/0:1 Not tainted 4.14.0-rc2-42613-g1488251d1a98 #254 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Workqueue: usb_hub_wq hub_event task: ffff88006befe300 task.stack: ffff88006bf78000 RIP: 0010:flexcop_usb_transfer_init drivers/media/usb/b2c2/flexcop-usb.c:429 RIP: 0010:flexcop_usb_probe+0x4c9/0xc00 drivers/media/usb/b2c2/flexcop-usb.c:574 RSP: 0018:ffff88006bf7e570 EFLAGS: 00010247 RAX: dffffc0000000000 RBX: ffff880069440000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff88006befeca8 RDI: 0000000000000004 RBP: ffff88006bf7e5e8 R08: 1ffff1000d7efb34 R09: 0000000000000000 R10: ffff88006bf7e4d0 R11: 0000000000000000 R12: ffff88006bafa200 R13: 0000000000000000 R14: 0000000000000000 R15: ffff880062b51198 FS: 0000000000000000(0000) GS:ffff88006c800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000fb4 CR3: 00000000674bb000 CR4: 00000000000006f0 Call Trace: usb_probe_interface+0x35d/0x8e0 drivers/usb/core/driver.c:361 really_probe drivers/base/dd.c:413 driver_probe_device+0x610/0xa00 drivers/base/dd.c:557 __device_attach_driver+0x230/0x290 drivers/base/dd.c:653 bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463 __device_attach+0x26e/0x3d0 drivers/base/dd.c:710 device_initial_probe+0x1f/0x30 drivers/base/dd.c:757 bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523 device_add+0xd0b/0x1660 drivers/base/core.c:1835 usb_set_configuration+0x104e/0x1870 drivers/usb/core/message.c:1932 generic_probe+0x73/0xe0 drivers/usb/core/generic.c:174 usb_probe_device+0xaf/0xe0 drivers/usb/core/driver.c:266 really_probe drivers/base/dd.c:413 driver_probe_device+0x610/0xa00 drivers/base/dd.c:557 __device_attach_driver+0x230/0x290 drivers/base/dd.c:653 bus_for_each_drv+0x161/0x210 drivers/base/bus.c:463 __device_attach+0x26e/0x3d0 drivers/base/dd.c:710 device_initial_probe+0x1f/0x30 drivers/base/dd.c:757 bus_probe_device+0x1eb/0x290 drivers/base/bus.c:523 device_add+0xd0b/0x1660 drivers/base/core.c:1835 usb_new_device+0x7b8/0x1020 drivers/usb/core/hub.c:2457 hub_port_connect drivers/usb/core/hub.c:4903 hub_port_connect_change drivers/usb/core/hub.c:5009 port_event drivers/usb/core/hub.c:5115 hub_event+0x194d/0x3740 drivers/usb/core/hub.c:5195 process_one_work+0xc7f/0x1db0 kernel/workqueue.c:2119 worker_thread+0x221/0x1850 kernel/workqueue.c:2253 kthread+0x3a1/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 Code: 18 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 fa 05 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 6d 18 49 8d 7d 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 RIP: flexcop_usb_probe+0x4c9/0xc00 RSP: ffff88006bf7e570 ---[ end trace 71daccc5f58e2db2 ]---
