linux-kernel - [syzbot] memory leak in hub

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Date:   Fri, 11 Feb 2022 12:17:26 -0800
From:   syzbot <syzbot+8caaaec4e7a55d75e243@...kaller.appspotmail.com>
To:     gregkh@...uxfoundation.org, heikki.krogerus@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        noralf@...nnes.org, stern@...land.harvard.edu,
        syzkaller-bugs@...glegroups.com, tzimmermann@...e.de
Subject: [syzbot] memory leak in hub_event (3)

Hello,

syzbot found the following issue on:

HEAD commit:    dfd42facf1e4 Linux 5.17-rc3
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14b4ef7c700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=48b71604a367da6e
dashboard link: https://syzkaller.appspot.com/bug?extid=8caaaec4e7a55d75e243
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1396902c700000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1466e662700000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8caaaec4e7a55d75e243@...kaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88810d49e800 (size 2048):
  comm "kworker/1:1", pid 25, jiffies 4294954629 (age 16.460s)
  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:
    [<ffffffff82c87a62>] kmalloc include/linux/slab.h:581 [inline]
    [<ffffffff82c87a62>] kzalloc include/linux/slab.h:715 [inline]
    [<ffffffff82c87a62>] usb_alloc_dev+0x32/0x450 drivers/usb/core/usb.c:582
    [<ffffffff82c91a47>] hub_port_connect drivers/usb/core/hub.c:5260 [inline]
    [<ffffffff82c91a47>] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline]
    [<ffffffff82c91a47>] port_event drivers/usb/core/hub.c:5660 [inline]
    [<ffffffff82c91a47>] hub_event+0x1097/0x21a0 drivers/usb/core/hub.c:5742
    [<ffffffff8126c3ef>] process_one_work+0x2bf/0x600 kernel/workqueue.c:2307
    [<ffffffff8126ccd9>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2454
    [<ffffffff81276765>] kthread+0x125/0x160 kernel/kthread.c:377
    [<ffffffff810022ff>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

BUG: memory leak
unreferenced object 0xffff88810f5bd660 (size 32):
  comm "kworker/1:1", pid 25, jiffies 4294954629 (age 16.460s)
  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:
    [<ffffffff822cae8c>] kvasprintf+0x6c/0xf0 lib/kasprintf.c:25
    [<ffffffff822caf68>] kvasprintf_const+0x58/0x110 lib/kasprintf.c:49
    [<ffffffff823c074b>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:289
    [<ffffffff826ae353>] dev_set_name+0x63/0x90 drivers/base/core.c:3193
    [<ffffffff82c87c20>] usb_alloc_dev+0x1f0/0x450 drivers/usb/core/usb.c:650
    [<ffffffff82c91a47>] hub_port_connect drivers/usb/core/hub.c:5260 [inline]
    [<ffffffff82c91a47>] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline]
    [<ffffffff82c91a47>] port_event drivers/usb/core/hub.c:5660 [inline]
    [<ffffffff82c91a47>] hub_event+0x1097/0x21a0 drivers/usb/core/hub.c:5742
    [<ffffffff8126c3ef>] process_one_work+0x2bf/0x600 kernel/workqueue.c:2307
    [<ffffffff8126ccd9>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2454
    [<ffffffff81276765>] kthread+0x125/0x160 kernel/kthread.c:377
    [<ffffffff810022ff>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

BUG: memory leak
unreferenced object 0xffff888109944200 (size 256):
  comm "kworker/1:1", pid 25, jiffies 4294954683 (age 15.920s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 08 42 94 09 81 88 ff ff  .........B......
    08 42 94 09 81 88 ff ff f0 e3 6a 82 ff ff ff ff  .B........j.....
  backtrace:
    [<ffffffff826b3d9b>] kmalloc include/linux/slab.h:581 [inline]
    [<ffffffff826b3d9b>] kzalloc include/linux/slab.h:715 [inline]
    [<ffffffff826b3d9b>] device_private_init drivers/base/core.c:3249 [inline]
    [<ffffffff826b3d9b>] device_add+0x89b/0xdf0 drivers/base/core.c:3299
    [<ffffffff8439de0c>] usb_new_device.cold+0x10f/0x58e drivers/usb/core/hub.c:2566
    [<ffffffff82c91d14>] hub_port_connect drivers/usb/core/hub.c:5358 [inline]
    [<ffffffff82c91d14>] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline]
    [<ffffffff82c91d14>] port_event drivers/usb/core/hub.c:5660 [inline]
    [<ffffffff82c91d14>] hub_event+0x1364/0x21a0 drivers/usb/core/hub.c:5742
    [<ffffffff8126c3ef>] process_one_work+0x2bf/0x600 kernel/workqueue.c:2307
    [<ffffffff8126ccd9>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2454
    [<ffffffff81276765>] kthread+0x125/0x160 kernel/kthread.c:377
    [<ffffffff810022ff>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295



---
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