netdev - Re: PROBLEM: System hang when connecting USB modem (GCT/Yota LU150)

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Message-ID: <87h9fibzkx.fsf@nemi.mork.no>
Date:	Sun, 03 Apr 2016 15:18:22 +0200
From:	Bjørn Mork <bjorn@...k.no>
To:	Alex <alex3kov@...o.com>
Cc:	linux-wireless@...r.kernel.org, linux-usb@...r.kernel.org,
	netdev@...r.kernel.org, Oliver Neukum <oneukum@...e.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: PROBLEM: System hang when connecting USB modem (GCT/Yota LU150)

Alex <alex3kov@...o.com> writes:

> Apr 01 11:33:24 arch kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000003
> Apr 01 11:33:24 arch kernel: IP: [<ffffffffa0bc62a1>] usbnet_generic_cdc_bind+0x171/0x710 [cdc_ether]
..
> Apr 01 11:33:24 arch kernel: Call Trace:
> Apr 01 11:33:24 arch kernel:  [<ffffffffa0bcf5b2>] generic_rndis_bind+0x62/0x520 [rndis_host]
> Apr 01 11:33:24 arch kernel:  [<ffffffff81499e82>] ? alloc_netdev_mqs+0x302/0x440
> Apr 01 11:33:24 arch kernel:  [<ffffffffa0bcfa83>] rndis_bind+0x13/0x20 [rndis_host]

This is most likely fixed by commit 29c6dd591bbd ("cdc-acm: fix NULL
pointer reference").  Which should defintely go into the 4.4 stable
series.  Could you please add it to your v4.4 queue, David?

Ignore the "cdc-acm" prefix. The patch fixes a NULL pointer dereference
in the cdc_ether/rndis_host drivers introduced by commit 823bd3433424
("cdc-ether: switch to common CDC parser")

Bjørn