From: Sasha Levin <levinsasha928@gmail.com>
To: "Sjur Brændeland" <sjurbren@gmail.com>
Cc: davem@davemloft.net, davej@redhat.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] net: caif: Don't act on notification for non-caif devices
Date: Tue, 24 Jan 2012 09:49:21 -0500 [thread overview]
Message-ID: <1327416561.32498.10.camel@lappy> (raw)
In-Reply-To: <CAJK669acbPLTxTDrk_uqdB2FmewcSA+HF0qEFADgT8YdfNMcpQ@mail.gmail.com>
On Tue, 2012-01-24 at 11:52 +0100, Sjur Brændeland wrote:
>
> Nack, we have to handle other device types than just ARPHDR_CAIF after
> introducing
> CAIF over USB/NCM. I'd rather fix this in netns by removing the BUG_ON
> and return
> NULL. How about this instead:
[snip]
I think that doing it this way is wrong for two reasons:
1. The code in net/ assumes net_generic is a trivial dereference and doesn't check that it's not NULL. This means that if anything goes wrong there you'll have a more dangerous NULL deref instead of a BUG().
2. You'll need to add other device to that if() statement anyway, as it currently looks like this:
cfg = get_cfcnfg(dev_net(dev));
caifdevs = caif_device_list(dev_net(dev));
if (!cfg || !caifdevs)
return 0;
caifd = caif_get(dev);
if (caifd == NULL && dev->type != ARPHRD_CAIF)
return 0;
What my patch did was simply move the type check to above the net_generic call, it didn't add any new checks - which according to what you said, you'll need to do anyway.
--
Sasha.
next prev parent reply other threads:[~2012-01-24 12:49 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-24 7:30 [PATCH] net: caif: Don't act on notification for non-caif devices Sasha Levin
2012-01-24 10:52 ` Sjur Brændeland
2012-01-24 14:49 ` Sasha Levin [this message]
2012-01-24 15:06 ` Sjur Brændeland
2012-01-24 15:23 ` Sasha Levin
2012-01-24 22:27 ` [PATCH net] caif: Fix crash due to uninitialized net name-space Sjur Brændeland
2012-01-24 22:44 ` David Miller
2012-01-25 16:13 ` Sasha Levin
2012-01-25 20:33 ` Sjur Brændeland
2012-01-26 6:14 ` Eric Dumazet
2012-01-26 10:41 ` [PATCH] netns: fix net_alloc_generic() Eric Dumazet
2012-01-26 10:44 ` Pavel Emelyanov
2012-01-26 10:51 ` Eric Dumazet
2012-01-26 22:57 ` Eric W. Biederman
2012-01-26 23:07 ` David Miller
2012-01-26 23:57 ` Eric W. Biederman
2012-01-27 0:02 ` [PATCH 1/2] netns: Fail conspicously if someone uses net_generic at an inappropriate time Eric W. Biederman
2012-01-27 0:04 ` [PATCH 2/2] net caif: Register properly as a pernet subsystem Eric W. Biederman
2012-01-27 13:24 ` Sasha Levin
2012-01-27 14:48 ` Sjur BRENDELAND
2012-01-28 2:07 ` David Miller
2012-01-28 2:07 ` [PATCH 1/2] netns: Fail conspicously if someone uses net_generic at an inappropriate time David Miller
2012-01-27 6:09 ` [PATCH] netns: fix net_alloc_generic() Eric Dumazet
2012-01-27 6:54 ` Eric W. Biederman
2012-01-27 7:07 ` Eric Dumazet
2012-01-26 14:40 ` Sasha Levin
2012-01-26 18:37 ` David Miller
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