netdev - Re: [PATCH 06/11] netdev: bfin_mac: avoid tx skb overflows in the tx DMA ring

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]

Date:	Wed, 19 May 2010 13:12:19 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	sonic.adi@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 06/11] netdev: bfin_mac: avoid tx skb overflows in the
 tx DMA ring

From: Sonic Zhang <sonic.adi@...il.com>
Date: Wed, 19 May 2010 17:23:16 +0800

> No, this doesn't happen, because before ndo_start_xmit() returns, the
> old TX buffers and skbs in the ring, which finished DMA operation, are
> freed. The only difference is that the free operation of a skb is done
> in next tx transfer.

This is still illegal.

What if TX activity stops right then, and there is no "next tx
transfer"?

That SKB will never get freed, ever.

You have to fix this.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html