memory leak in pcan_usb_fd_init

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 0477e928 Linux 5.10-rc7
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16dacc13500000
kernel config: https://syzkaller.appspot.com/x/.config?x=4305fa9ea70c7a9f
dashboard link: https://syzkaller.appspot.com/bug?extid=91adee8d9ebb9193d22d
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14e1d00f500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=153ac2cb500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+91adee...@syzkaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88810f4cc200 (size 128):
comm "kworker/1:1", pid 34, jiffies 4294942277 (age 8.590s)
hex dump (first 32 bytes):
40 09 42 12 81 88 ff ff 00 00 00 00 00 00 00 00 @.B.............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000a24b3bdd>] kmalloc include/linux/slab.h:552 [inline]
[<00000000a24b3bdd>] kzalloc include/linux/slab.h:664 [inline]
[<00000000a24b3bdd>] pcan_usb_fd_init+0x156/0x210 drivers/net/can/usb/peak_usb/pcan_usb_fd.c:865
[<000000007ba29c7f>] peak_usb_create_dev drivers/net/can/usb/peak_usb/pcan_usb_core.c:850 [inline]
[<000000007ba29c7f>] peak_usb_probe+0x389/0x490 drivers/net/can/usb/peak_usb/pcan_usb_core.c:948
[<00000000ea93b2ea>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
[<000000001ee8e05e>] really_probe+0x159/0x480 drivers/base/dd.c:554
[<0000000010c7fe39>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
[<0000000020e41d8d>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844
[<000000000272c5fa>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
[<00000000d3b1aa42>] __device_attach+0x122/0x250 drivers/base/dd.c:912
[<00000000a0b053c3>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
[<00000000dfb5e550>] device_add+0x5ac/0xc30 drivers/base/core.c:2936
[<00000000d6321aa6>] usb_set_configuration+0x9de/0xb90 drivers/usb/core/message.c:2159
[<000000003d1efb2f>] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238
[<000000000a7312a8>] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293
[<000000001ee8e05e>] really_probe+0x159/0x480 drivers/base/dd.c:554
[<0000000010c7fe39>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
[<0000000020e41d8d>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844

BUG: memory leak
unreferenced object 0xffff88810f7a4800 (size 512):
comm "kworker/1:1", pid 34, jiffies 4294942277 (age 8.590s)
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 ff ff ff ff ff ff ff ff ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<000000009ddd23ca>] kmalloc include/linux/slab.h:552 [inline]
[<000000009ddd23ca>] kzalloc include/linux/slab.h:664 [inline]
[<000000009ddd23ca>] pcan_usb_fd_init+0x181/0x210 drivers/net/can/usb/peak_usb/pcan_usb_fd.c:870
[<000000007ba29c7f>] peak_usb_create_dev drivers/net/can/usb/peak_usb/pcan_usb_core.c:850 [inline]
[<000000007ba29c7f>] peak_usb_probe+0x389/0x490 drivers/net/can/usb/peak_usb/pcan_usb_core.c:948
[<00000000ea93b2ea>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
[<000000001ee8e05e>] really_probe+0x159/0x480 drivers/base/dd.c:554
[<0000000010c7fe39>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
[<0000000020e41d8d>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844
[<000000000272c5fa>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
[<00000000d3b1aa42>] __device_attach+0x122/0x250 drivers/base/dd.c:912
[<00000000a0b053c3>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
[<00000000dfb5e550>] device_add+0x5ac/0xc30 drivers/base/core.c:2936
[<00000000d6321aa6>] usb_set_configuration+0x9de/0xb90 drivers/usb/core/message.c:2159
[<000000003d1efb2f>] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238
[<000000000a7312a8>] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293
[<000000001ee8e05e>] really_probe+0x159/0x480 drivers/base/dd.c:554
[<0000000010c7fe39>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
[<0000000020e41d8d>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844



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