netdev - Re: [PATCH] netlink: invert error code in netlink_set

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Date:	Wed, 04 Mar 2009 11:13:50 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Pablo Neira Ayuso <pablo@...filter.org>
CC:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH] netlink: invert error code in netlink_set_err()

Pablo Neira Ayuso wrote:
> The callers of netlink_set_err() currently pass a negative value
> as parameter for the error code. However, sk->sk_err wants a
> positive error value. Without this patch, skb_recv_datagram() called
> by netlink_recvmsg() may return a positive value to report an error.
> 
> Another choice to fix this is to change callers to pass a positive
> error value, but this seems a bit inconsistent and error prone
> to me. Indeed, the callers of netlink_set_err() assumed that the
> (usual) negative value for error codes was fine before this patch :).

Amazing how this kept hidden for so long. I could have sworn I've
already seen the notification errors in userspace :)
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