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Date:   Fri, 20 Nov 2020 07:15:20 -0800
From:   syzbot <syzbot+44e64397bd81d5e84cba@...kaller.appspotmail.com>
To:     balbi@...nel.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: memory leak in hub_event

Hello,

syzbot found the following issue on:

HEAD commit:    4d02da97 Merge tag 'net-5.10-rc5' of git://git.kernel.org/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13a7d2b6500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c5353ac514ca5a43
dashboard link: https://syzkaller.appspot.com/bug?extid=44e64397bd81d5e84cba
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14925089500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16810051500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+44e64397bd81d5e84cba@...kaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88810d5ff800 (size 2048):
  comm "kworker/1:0", pid 17, jiffies 4294949188 (age 14.280s)
  hex dump (first 32 bytes):
    ff ff ff ff 31 00 00 00 00 00 00 00 00 00 00 00  ....1...........
    00 00 00 00 00 00 00 00 00 00 00 00 03 00 00 00  ................
  backtrace:
    [<00000000f0428224>] kmalloc include/linux/slab.h:552 [inline]
    [<00000000f0428224>] kzalloc include/linux/slab.h:664 [inline]
    [<00000000f0428224>] usb_alloc_dev+0x32/0x450 drivers/usb/core/usb.c:582
    [<000000001802b3dd>] hub_port_connect drivers/usb/core/hub.c:5128 [inline]
    [<000000001802b3dd>] hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
    [<000000001802b3dd>] port_event drivers/usb/core/hub.c:5508 [inline]
    [<000000001802b3dd>] hub_event+0x118d/0x20d0 drivers/usb/core/hub.c:5590
    [<0000000092d3650d>] process_one_work+0x27d/0x590 kernel/workqueue.c:2272
    [<00000000d4629ab0>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2418
    [<000000003c358b45>] kthread+0x178/0x1b0 kernel/kthread.c:292
    [<000000003689dbb0>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

BUG: memory leak
unreferenced object 0xffff888112544c40 (size 32):
  comm "kworker/1:0", pid 17, jiffies 4294949188 (age 14.280s)
  hex dump (first 32 bytes):
    31 2d 31 00 00 00 00 00 00 00 00 00 00 00 00 00  1-1.............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000d0f4aa93>] kvasprintf+0x6c/0xf0 lib/kasprintf.c:25
    [<000000005866b3ad>] kvasprintf_const+0x58/0x110 lib/kasprintf.c:49
    [<00000000b590b008>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:289
    [<00000000d251a578>] dev_set_name+0x63/0x90 drivers/base/core.c:2722
    [<0000000075b37c03>] usb_alloc_dev+0x1ee/0x450 drivers/usb/core/usb.c:650
    [<000000001802b3dd>] hub_port_connect drivers/usb/core/hub.c:5128 [inline]
    [<000000001802b3dd>] hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
    [<000000001802b3dd>] port_event drivers/usb/core/hub.c:5508 [inline]
    [<000000001802b3dd>] hub_event+0x118d/0x20d0 drivers/usb/core/hub.c:5590
    [<0000000092d3650d>] process_one_work+0x27d/0x590 kernel/workqueue.c:2272
    [<00000000d4629ab0>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2418
    [<000000003c358b45>] kthread+0x178/0x1b0 kernel/kthread.c:292
    [<000000003689dbb0>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

BUG: memory leak
unreferenced object 0xffff888112544ce0 (size 32):
  comm "kworker/1:0", pid 17, jiffies 4294949231 (age 13.850s)
  hex dump (first 32 bytes):
    00 4d 54 12 81 88 ff ff 00 00 00 00 00 00 00 00  .MT.............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<000000005516ca37>] kmalloc include/linux/slab.h:557 [inline]
    [<000000005516ca37>] kzalloc include/linux/slab.h:664 [inline]
    [<000000005516ca37>] usb_get_configuration+0xce/0x1dd0 drivers/usb/core/config.c:887
    [<000000009ab33a39>] usb_enumerate_device drivers/usb/core/hub.c:2387 [inline]
    [<000000009ab33a39>] usb_new_device+0x1a9/0x2e0 drivers/usb/core/hub.c:2523
    [<0000000069b10350>] hub_port_connect drivers/usb/core/hub.c:5222 [inline]
    [<0000000069b10350>] hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
    [<0000000069b10350>] port_event drivers/usb/core/hub.c:5508 [inline]
    [<0000000069b10350>] hub_event+0x144a/0x20d0 drivers/usb/core/hub.c:5590
    [<0000000092d3650d>] process_one_work+0x27d/0x590 kernel/workqueue.c:2272
    [<00000000d4629ab0>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2418
    [<000000003c358b45>] kthread+0x178/0x1b0 kernel/kthread.c:292
    [<000000003689dbb0>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

BUG: memory leak
unreferenced object 0xffff888112544bc0 (size 32):
  comm "kworker/1:0", pid 17, jiffies 4294949247 (age 13.690s)
  hex dump (first 32 bytes):
    73 79 7a 00 00 00 00 00 00 00 00 00 00 00 00 00  syz.............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000b344f779>] kmalloc include/linux/slab.h:557 [inline]
    [<00000000b344f779>] usb_cache_string+0x8a/0xf0 drivers/usb/core/message.c:1025
    [<0000000074577e65>] usb_enumerate_device drivers/usb/core/hub.c:2397 [inline]
    [<0000000074577e65>] usb_new_device+0x98/0x2e0 drivers/usb/core/hub.c:2523
    [<0000000069b10350>] hub_port_connect drivers/usb/core/hub.c:5222 [inline]
    [<0000000069b10350>] hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
    [<0000000069b10350>] port_event drivers/usb/core/hub.c:5508 [inline]
    [<0000000069b10350>] hub_event+0x144a/0x20d0 drivers/usb/core/hub.c:5590
    [<0000000092d3650d>] process_one_work+0x27d/0x590 kernel/workqueue.c:2272
    [<00000000d4629ab0>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2418
    [<000000003c358b45>] kthread+0x178/0x1b0 kernel/kthread.c:292
    [<000000003689dbb0>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

BUG: memory leak
unreferenced object 0xffff888112544cc0 (size 32):
  comm "kworker/1:0", pid 17, jiffies 4294949251 (age 13.650s)
  hex dump (first 32 bytes):
    73 79 7a 00 00 00 00 00 00 00 00 00 00 00 00 00  syz.............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000b344f779>] kmalloc include/linux/slab.h:557 [inline]
    [<00000000b344f779>] usb_cache_string+0x8a/0xf0 drivers/usb/core/message.c:1025
    [<000000003d5bd90b>] usb_enumerate_device drivers/usb/core/hub.c:2398 [inline]
    [<000000003d5bd90b>] usb_new_device+0xae/0x2e0 drivers/usb/core/hub.c:2523
    [<0000000069b10350>] hub_port_connect drivers/usb/core/hub.c:5222 [inline]
    [<0000000069b10350>] hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
    [<0000000069b10350>] port_event drivers/usb/core/hub.c:5508 [inline]
    [<0000000069b10350>] hub_event+0x144a/0x20d0 drivers/usb/core/hub.c:5590
    [<0000000092d3650d>] process_one_work+0x27d/0x590 kernel/workqueue.c:2272
    [<00000000d4629ab0>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2418
    [<000000003c358b45>] kthread+0x178/0x1b0 kernel/kthread.c:292
    [<000000003689dbb0>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

BUG: memory leak
unreferenced object 0xffff888112544d40 (size 32):
  comm "kworker/1:0", pid 17, jiffies 4294949255 (age 13.610s)
  hex dump (first 32 bytes):
    73 79 7a 00 00 00 00 00 00 00 00 00 00 00 00 00  syz.............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000b344f779>] kmalloc include/linux/slab.h:557 [inline]
    [<00000000b344f779>] usb_cache_string+0x8a/0xf0 drivers/usb/core/message.c:1025
    [<000000007392d5f6>] usb_enumerate_device drivers/usb/core/hub.c:2400 [inline]
    [<000000007392d5f6>] usb_new_device+0xc4/0x2e0 drivers/usb/core/hub.c:2523
    [<0000000069b10350>] hub_port_connect drivers/usb/core/hub.c:5222 [inline]
    [<0000000069b10350>] hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
    [<0000000069b10350>] port_event drivers/usb/core/hub.c:5508 [inline]
    [<0000000069b10350>] hub_event+0x144a/0x20d0 drivers/usb/core/hub.c:5590
    [<0000000092d3650d>] process_one_work+0x27d/0x590 kernel/workqueue.c:2272
    [<00000000d4629ab0>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2418
    [<000000003c358b45>] kthread+0x178/0x1b0 kernel/kthread.c:292
    [<000000003689dbb0>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

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