linux-kernel - [syzbot] memory leak in usb_get

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Message-ID: <000000000000351b8605d9d1d1bf@google.com>
Date:   Wed, 09 Mar 2022 15:54:24 -0800
From:   syzbot <syzbot+f0fae482604e6d9a87c9@...kaller.appspotmail.com>
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, pavel.hofman@...tera.com,
        rob@...greener.com, stern@...land.harvard.edu,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] memory leak in usb_get_configuration

Hello,

syzbot found the following issue on:

HEAD commit:    0014404f9c18 Merge branch 'akpm' (patches from Andrew)
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15864216700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3f0a704147ec8e32
dashboard link: https://syzkaller.appspot.com/bug?extid=f0fae482604e6d9a87c9
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=13a63dbe700000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10e150a1700000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f0fae482604e6d9a87c9@...kaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88810c0289e0 (size 32):
  comm "kworker/1:2", pid 139, jiffies 4294947862 (age 15.910s)
  hex dump (first 32 bytes):
    09 02 12 00 01 00 00 00 00 09 04 00 00 00 d0 bb  ................
    3a 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  :...............
  backtrace:
    [<ffffffff82c98127>] kmalloc include/linux/slab.h:586 [inline]
    [<ffffffff82c98127>] usb_get_configuration+0x1c7/0x1cd0 drivers/usb/core/config.c:919
    [<ffffffff82c863f9>] usb_enumerate_device drivers/usb/core/hub.c:2398 [inline]
    [<ffffffff82c863f9>] usb_new_device+0x1a9/0x2e0 drivers/usb/core/hub.c:2536
    [<ffffffff82c88ea4>] hub_port_connect drivers/usb/core/hub.c:5358 [inline]
    [<ffffffff82c88ea4>] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline]
    [<ffffffff82c88ea4>] port_event drivers/usb/core/hub.c:5660 [inline]
    [<ffffffff82c88ea4>] hub_event+0x1364/0x21a0 drivers/usb/core/hub.c:5742
    [<ffffffff8126a41f>] process_one_work+0x2bf/0x600 kernel/workqueue.c:2307
    [<ffffffff8126ad49>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2454
    [<ffffffff81274705>] kthread+0x125/0x160 kernel/kthread.c:377
    [<ffffffff810021ef>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

BUG: memory leak
unreferenced object 0xffff88810a600f40 (size 64):
  comm "kworker/1:2", pid 139, jiffies 4294947866 (age 15.870s)
  hex dump (first 32 bytes):
    01 00 00 00 01 00 00 00 09 04 00 00 00 d0 bb 3a  ...............:
    00 00 00 00 00 00 00 00 f2 89 02 0c 81 88 ff ff  ................
  backtrace:
    [<ffffffff82c9871d>] kmalloc include/linux/slab.h:586 [inline]
    [<ffffffff82c9871d>] kzalloc include/linux/slab.h:714 [inline]
    [<ffffffff82c9871d>] usb_parse_configuration drivers/usb/core/config.c:772 [inline]
    [<ffffffff82c9871d>] usb_get_configuration+0x7bd/0x1cd0 drivers/usb/core/config.c:944
    [<ffffffff82c863f9>] usb_enumerate_device drivers/usb/core/hub.c:2398 [inline]
    [<ffffffff82c863f9>] usb_new_device+0x1a9/0x2e0 drivers/usb/core/hub.c:2536
    [<ffffffff82c88ea4>] hub_port_connect drivers/usb/core/hub.c:5358 [inline]
    [<ffffffff82c88ea4>] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline]
    [<ffffffff82c88ea4>] port_event drivers/usb/core/hub.c:5660 [inline]
    [<ffffffff82c88ea4>] hub_event+0x1364/0x21a0 drivers/usb/core/hub.c:5742
    [<ffffffff8126a41f>] process_one_work+0x2bf/0x600 kernel/workqueue.c:2307
    [<ffffffff8126ad49>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2454
    [<ffffffff81274705>] kthread+0x125/0x160 kernel/kthread.c:377
    [<ffffffff810021ef>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295



---
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syzbot can test patches for this issue, for details see:
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