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Date: Thu, 09 Jul 2020 12:36:26 -0700 (PDT) From: David Miller <davem@...emloft.net> To: mkubecek@...e.cz Cc: kuba@...nel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH net] ethtool: fix genlmsg_put() failure handling in ethnl_default_dumpit() From: Michal Kubecek <mkubecek@...e.cz> Date: Thu, 9 Jul 2020 12:11:50 +0200 (CEST) > If the genlmsg_put() call in ethnl_default_dumpit() fails, we bail out > without checking if we already have some messages in current skb like we do > with ethnl_default_dump_one() failure later. Therefore if existing messages > almost fill up the buffer so that there is not enough space even for > netlink and genetlink header, we lose all prepared messages and return and > error. > > Rather than duplicating the skb->len check, move the genlmsg_put(), > genlmsg_cancel() and genlmsg_end() calls into ethnl_default_dump_one(). > This is also more logical as all message composition will be in > ethnl_default_dump_one() and only iteration logic will be left in > ethnl_default_dumpit(). > > Fixes: 728480f12442 ("ethtool: default handlers for GET requests") > Reported-by: Jakub Kicinski <kuba@...nel.org> > Signed-off-by: Michal Kubecek <mkubecek@...e.cz> Applied and queued up for -stable, thanks.
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