From: David Miller <davem@davemloft.net>
To: mb@bu3sch.de
Cc: johannes@sipsolutions.net, kune@deine-taler.de, dsd@gentoo.org,
linux-wireless@vger.kernel.org
Subject: Re: zd1211 or mac80211: SKB invalid truesize
Date: Tue, 25 Sep 2007 14:18:16 -0700 (PDT) [thread overview]
Message-ID: <20070925.141816.71108553.davem@davemloft.net> (raw)
In-Reply-To: <200709252242.12331.mb@bu3sch.de>
From: Michael Buesch <mb@bu3sch.de>
Date: Tue, 25 Sep 2007 22:42:11 +0200
> I get dmesg spammed with the following message when
> I connect to an open network with zd1211rw-mac80211.
> I'm not sure if that's a bug in zd or mac80211.
> Any idea how to debug this?
>
> [ 280.915811] SKB BUG: Invalid truesize (840) len=1440, sizeof(sk_buff)=168
>
> The device keeps working fine while this spams dmesg.
For anyone who investigates this, the issue is that if there is a
socket associated with an skb (ie. skb->sk is non-NULL) you cannot
change the skb->truesize without also adjusting the memory accounted
to the socket.
Otherwise when the SKB gets freed, the wrong amount of socket buffer
memory allocation will be given back to the socket.
When the above message triggers, it means the skb->truesize is
smaller than skb->len plus the size of struct sk_buff which is
obviously completely bogus.
next prev parent reply other threads:[~2007-09-25 21:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-25 20:42 zd1211 or mac80211: SKB invalid truesize Michael Buesch
2007-09-25 21:18 ` David Miller [this message]
2007-09-25 21:25 ` Michael Buesch
2007-09-25 21:30 ` David Miller
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