memory leak in cinergyt2_fe_attach

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    3d5e28bf Merge branch 'stable/for-linus-5.10-rc2' of git:/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10bae3aa500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a3f13716fa0212fd
dashboard link: https://syzkaller.appspot.com/bug?extid=e1de8986786b3722050e
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1781dd4e500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1636b181500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e1de8986786b3722050e@xxxxxxxxxxxxxxxxxxxxxxxxx

BUG: memory leak
unreferenced object 0xffff88810d626800 (size 2048):
  comm "kworker/0:1", pid 7, jiffies 4294946031 (age 8.260s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 54 65 72 72 61 54 65 63  ........TerraTec
    2f 71 61 6e 75 20 55 53 42 32 2e 30 20 48 69 67  /qanu USB2.0 Hig
  backtrace:
    [<000000001868ec69>] kmalloc include/linux/slab.h:552 [inline]
    [<000000001868ec69>] kzalloc include/linux/slab.h:664 [inline]
    [<000000001868ec69>] cinergyt2_fe_attach+0x21/0x80 drivers/media/usb/dvb-usb/cinergyT2-fe.c:271
    [<0000000069d80651>] cinergyt2_frontend_attach+0x21/0x70 drivers/media/usb/dvb-usb/cinergyT2-core.c:74
    [<00000000c12d6c47>] dvb_usb_adapter_frontend_init+0x11b/0x1b0 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:290
    [<0000000012dc4d47>] dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:84 [inline]
    [<0000000012dc4d47>] dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:173 [inline]
    [<0000000012dc4d47>] dvb_usb_device_init.cold+0x4d0/0x6ae drivers/media/usb/dvb-usb/dvb-usb-init.c:287
    [<000000009a40ba79>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
    [<0000000092664fce>] really_probe+0x159/0x480 drivers/base/dd.c:554
    [<00000000ac3ae41f>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
    [<000000008558e2d5>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844
    [<00000000562cb0b9>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
    [<0000000056762cde>] __device_attach+0x122/0x250 drivers/base/dd.c:912
    [<00000000412c6765>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
    [<000000000a5960bb>] device_add+0x5ac/0xc30 drivers/base/core.c:2936
    [<000000009ab6c3b2>] usb_set_configuration+0x9de/0xb90 drivers/usb/core/message.c:2159
    [<00000000f4ffc3df>] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238
    [<00000000b38e25bd>] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293
    [<0000000092664fce>] really_probe+0x159/0x480 drivers/base/dd.c:554



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