netdev - Re: [PATCH] forcedeth: Fix WARNINGS that result when DMA mapping is not checked

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

Date:	Thu, 27 Dec 2012 13:03:29 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	linville@...driver.com, davem@...emloft.net,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] forcedeth: Fix WARNINGS that result when DMA mapping
 is not checked

On Thu, 2012-12-27 at 14:38 -0600, Larry Finger wrote:
> On 12/27/2012 02:05 PM, Eric Dumazet wrote:
> > On Thu, 2012-12-27 at 13:42 -0600, Larry Finger wrote:

> >> +		if (pci_dma_mapping_error(np->pci_dev,
> >> +					  np->put_tx_ctx->dma))
> >> +			return NETDEV_TX_BUSY;
> >
> > Really this is not going to work very well : caller will call this in a
> > loop.
> 
> Any suggestions on what value should be returned, or does the caller need to be 
> modified?

NETDEV_TX_BUSY is really obsolete

Documentation/networking/driver.txt

In case of mapping error, I would drop the packet.

(kfree_skb() it, increment a device tx_dropped counter,  and return
NETDEV_TX_OK)



--
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