memory leak in edge_startup

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    29c395c7 Merge tag 'x86-entry-2021-02-24' of git://git.ker..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10d694dad00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=66b7497b2c5acd67
dashboard link: https://syzkaller.appspot.com/bug?extid=59f777bdcbdd7eea5305
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=162940dad00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1650737ad00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+59f777bdcbdd7eea5305@xxxxxxxxxxxxxxxxxxxxxxxxx

BUG: memory leak
unreferenced object 0xffff88810dc5a800 (size 2048):
  comm "kworker/1:3", pid 4818, jiffies 4294960503 (age 15.050s)
  hex dump (first 32 bytes):
    20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ...............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000153c6b11>] kmalloc include/linux/slab.h:554 [inline]
    [<00000000153c6b11>] kzalloc include/linux/slab.h:684 [inline]
    [<00000000153c6b11>] edge_startup+0x3f/0x11f0 drivers/usb/serial/io_edgeport.c:2833
    [<000000007c25fa28>] usb_serial_probe.cold+0x6ab/0xb84 drivers/usb/serial/usb-serial.c:1027
    [<0000000050250e6f>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
    [<00000000f10f144c>] really_probe+0x159/0x4a0 drivers/base/dd.c:554
    [<0000000036a9ab90>] driver_probe_device+0x84/0x100 drivers/base/dd.c:740
    [<00000000a08d4f3b>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:846
    [<000000009356c1ed>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
    [<00000000aa8a21fd>] __device_attach+0x122/0x250 drivers/base/dd.c:914
    [<00000000ee865ab7>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
    [<000000005ea173b6>] device_add+0x5d5/0xc40 drivers/base/core.c:3242
    [<000000003faa2805>] usb_set_configuration+0x9d9/0xb90 drivers/usb/core/message.c:2164
    [<0000000099ff1454>] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238
    [<00000000a57fa7c3>] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293
    [<00000000f10f144c>] really_probe+0x159/0x4a0 drivers/base/dd.c:554
    [<0000000036a9ab90>] driver_probe_device+0x84/0x100 drivers/base/dd.c:740
    [<00000000a08d4f3b>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:846

BUG: memory leak
unreferenced object 0xffff888110c17540 (size 192):
  comm "kworker/1:3", pid 4818, jiffies 4294960524 (age 14.840s)
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 58 75 c1 10 81 88 ff ff  ........Xu......
  backtrace:
    [<000000003178be4d>] kmalloc include/linux/slab.h:559 [inline]
    [<000000003178be4d>] usb_alloc_urb+0x66/0xe0 drivers/usb/core/urb.c:74
    [<0000000006a81376>] edge_startup+0xd20/0x11f0 drivers/usb/serial/io_edgeport.c:2926
    [<000000007c25fa28>] usb_serial_probe.cold+0x6ab/0xb84 drivers/usb/serial/usb-serial.c:1027
    [<0000000050250e6f>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
    [<00000000f10f144c>] really_probe+0x159/0x4a0 drivers/base/dd.c:554
    [<0000000036a9ab90>] driver_probe_device+0x84/0x100 drivers/base/dd.c:740
    [<00000000a08d4f3b>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:846
    [<000000009356c1ed>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
    [<00000000aa8a21fd>] __device_attach+0x122/0x250 drivers/base/dd.c:914
    [<00000000ee865ab7>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
    [<000000005ea173b6>] device_add+0x5d5/0xc40 drivers/base/core.c:3242
    [<000000003faa2805>] usb_set_configuration+0x9d9/0xb90 drivers/usb/core/message.c:2164
    [<0000000099ff1454>] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238
    [<00000000a57fa7c3>] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293
    [<00000000f10f144c>] really_probe+0x159/0x4a0 drivers/base/dd.c:554
    [<0000000036a9ab90>] driver_probe_device+0x84/0x100 drivers/base/dd.c:740

BUG: memory leak
unreferenced object 0xffff888110c17240 (size 192):
  comm "kworker/1:3", pid 4818, jiffies 4294960524 (age 14.840s)
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 58 72 c1 10 81 88 ff ff  ........Xr......
  backtrace:
    [<000000003178be4d>] kmalloc include/linux/slab.h:559 [inline]
    [<000000003178be4d>] usb_alloc_urb+0x66/0xe0 drivers/usb/core/urb.c:74
    [<000000004f167a1a>] edge_startup+0xebf/0x11f0 drivers/usb/serial/io_edgeport.c:2963
    [<000000007c25fa28>] usb_serial_probe.cold+0x6ab/0xb84 drivers/usb/serial/usb-serial.c:1027
    [<0000000050250e6f>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
    [<00000000f10f144c>] really_probe+0x159/0x4a0 drivers/base/dd.c:554
    [<0000000036a9ab90>] driver_probe_device+0x84/0x100 drivers/base/dd.c:740
    [<00000000a08d4f3b>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:846
    [<000000009356c1ed>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
    [<00000000aa8a21fd>] __device_attach+0x122/0x250 drivers/base/dd.c:914
    [<00000000ee865ab7>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
    [<000000005ea173b6>] device_add+0x5d5/0xc40 drivers/base/core.c:3242
    [<000000003faa2805>] usb_set_configuration+0x9d9/0xb90 drivers/usb/core/message.c:2164
    [<0000000099ff1454>] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238
    [<00000000a57fa7c3>] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293
    [<00000000f10f144c>] really_probe+0x159/0x4a0 drivers/base/dd.c:554
    [<0000000036a9ab90>] driver_probe_device+0x84/0x100 drivers/base/dd.c:740



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