netdev - Re: [PATCH net] net: stmmac: free an skb first when there are no longer any descriptors using it

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <20170620.154123.561428545995150660.davem@davemloft.net>
Date:   Tue, 20 Jun 2017 15:41:23 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     niklas.cassel@...s.com
Cc:     peppe.cavallaro@...com, alexandre.torgue@...com, niklass@...s.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: stmmac: free an skb first when there are no
 longer any descriptors using it

From: Niklas Cassel <niklas.cassel@...s.com>
Date: Tue, 20 Jun 2017 14:32:41 +0200

> When having the skb pointer in the first descriptor, stmmac_tx_clean
> can get called at a moment where the IP has only cleared the own bit
> of the first descriptor, thus freeing the skb, even though there can
> be several descriptors whose buffers point into the same skb.
> 
> By simply moving the skb pointer from the first descriptor to the last
> descriptor, a skb will get freed only when the IP has cleared the
> own bit of all the descriptors that are using that skb.
> 
> Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>

Applied and queued up for -stable, thanks.