Re: [PATCH] fix use after free in netlink_kernel_create()

From: Patrick McHardy
Date: Sun Aug 13 2006 - 14:48:51 EST

Andrew Morton wrote:
> On Sun, 13 Aug 2006 13:52:58 +0200
> Patrick McHardy <kaber@xxxxxxxxx> wrote:
>>Quite a few users of netlink_kernel_create will panic when creating
>>the socket fails (rtnetlink for example, which is always present),
>>so you might as well call panic here directly.
> That's a bit lame. Panicing at do_initcalls() time is OK (something is
> seriously screwed anyway) but we usually try to handle the ENOMEM nicely if
> it happens at modprobe-time.

The users I looked at can't be built as modules (rtnetlink, genetlink,
audit subsystem), I'm not aware of any modules panicing on
netlink_kernel_create failure. But all of netlink, genetlink and
rtnetlink are always built-in when CONFIG_NET=y, so we might as well
panic here.

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