netdev - Re: TCP output handling bug ?

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Message-ID: <20140822021341.GB14353@redhat.com>
Date:	Thu, 21 Aug 2014 22:13:41 -0400
From:	Dave Jones <davej@...hat.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, netdev@...r.kernel.org
Subject: Re: TCP output handling bug ?

On Thu, Aug 21, 2014 at 05:24:45PM -0700, Stephen Hemminger wrote:
 > On Thu, 21 Aug 2014 19:02:08 +0100
 > Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
 > 
 > > 
 > > tcp_send_syn_data:
 > > 
 > >         TCP_SKB_CB(data)->tcp_flags &= ~TCPHDR_SYN;
 > >         TCP_SKB_CB(data)->tcp_flags = (TCPHDR_ACK|TCPHDR_PSH);
 > > 
 > > the reporter has a point 8)
 > > 
 > > https://bugzilla.kernel.org/show_bug.cgi?id=82101
 > 
 > I wonder if covertity or smatch could be smart enough to catch this kind of bug?

For coverity: it should be, but isn't :)
I've pointed them at the bugzilla, maybe they can add a check in a
future update.

I bet this isn't the only instance of a bug like this left in the tree.
We've definitely had similar cases before.

	Dave

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