linux-kernel - Re: [syzbot] memory leak in mgmt_cmd

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Message-ID: <0000000000007cfd9b05bf3d1b70@google.com>
Date:   Mon, 05 Apr 2021 10:34:18 -0700
From:   syzbot <syzbot+80f5bab4eb14d14e7386@...kaller.appspotmail.com>
To:     anant.thazhemadam@...il.com, davem@...emloft.net,
        johan.hedberg@...il.com, kuba@...nel.org,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        luiz.dentz@...il.com, marcel@...tmann.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] memory leak in mgmt_cmd_status

syzbot has found a reproducer for the following issue on:

HEAD commit:    e49d033b Linux 5.12-rc6
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12579f11d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b8dbd3c72fdc7777
dashboard link: https://syzkaller.appspot.com/bug?extid=80f5bab4eb14d14e7386
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=143b1696d00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14c5a30ed00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+80f5bab4eb14d14e7386@...kaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88810ddf4700 (size 232):
  comm "kworker/u5:2", pid 8406, jiffies 4294997792 (age 10.670s)
  hex dump (first 32 bytes):
    d0 f0 af 0e 81 88 ff ff d0 f0 af 0e 81 88 ff ff  ................
    00 00 00 00 00 00 00 00 00 f0 af 0e 81 88 ff ff  ................
  backtrace:
    [<ffffffff8364af8f>] __alloc_skb+0x20f/0x280 net/core/skbuff.c:412
    [<ffffffff83c5f871>] alloc_skb include/linux/skbuff.h:1103 [inline]
    [<ffffffff83c5f871>] mgmt_cmd_status+0x31/0x160 net/bluetooth/mgmt_util.c:102
    [<ffffffff83c2a669>] mgmt_set_discoverable_complete+0x1b9/0x1e0 net/bluetooth/mgmt.c:1357
    [<ffffffff83c579d8>] discoverable_update_work+0x88/0xb0 net/bluetooth/hci_request.c:2806
    [<ffffffff812595d9>] process_one_work+0x2c9/0x600 kernel/workqueue.c:2275
    [<ffffffff81259ec9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2421
    [<ffffffff812615f8>] kthread+0x178/0x1b0 kernel/kthread.c:292
    [<ffffffff8100227f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294