linux-kernel - [BUG] act_ife: sleeping functions called in atomic context

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Message-Id: <1466110219-4825-1-git-send-email-khoroshilov@ispras.ru>
Date:	Thu, 16 Jun 2016 23:50:19 +0300
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Jamal Hadi Salim <jhs@...atatu.com>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [BUG] act_ife: sleeping functions called in atomic context

tcf_ife_init() contains a big chunk of code executed with
ife->tcf_lock spinlock held. But that code contains several calls
to sleeping functions:
  populate_metalist() and use_all_metadata()
    -> add_metainfo()
      -> find_ife_oplist(metaid)
        -> read_lock()
        -> try_module_get(o->owner)
      -> kzalloc(sizeof(*mi), GFP_KERNEL);
      -> ops->alloc(mi, metaval);
      -> module_put(ops->owner);
  _tcf_ife_cleanup()
    -> module_put()

The same problem is actual for tcf_ife_cleanup() as well.

Found by Linux Driver Verification project (linuxtesting.org).

--
Alexey Khoroshilov
Linux Verification Center, ISPRAS
web: http://linuxtesting.org