Commit 365f9ae4 authored by Michal Kubecek's avatar Michal Kubecek Committed by David S. Miller
Browse files

ethtool: fix genlmsg_put() failure handling in ethnl_default_dumpit() 



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: 728480f1 ("ethtool: default handlers for GET requests")
Reported-by: default avatarJakub Kicinski <kuba@kernel.org>
Signed-off-by: default avatarMichal Kubecek <mkubecek@suse.cz>
Reviewed-by: default avatarJakub Kicinski <kuba@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 306381ae

net/ethtool/netlink.c

+13 −14
Original line number Diff line number Diff line
@@ -376,10 +376,17 @@ err_dev: 
}



static int ethnl_default_dump_one(struct sk_buff *skb, struct net_device *dev,

				  const struct ethnl_dump_ctx *ctx)

				  const struct ethnl_dump_ctx *ctx,

				  struct netlink_callback *cb)

{

	void *ehdr;

	int ret;



	ehdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,

			   &ethtool_genl_family, 0, ctx->ops->reply_cmd);

	if (!ehdr)

		return -EMSGSIZE;



	ethnl_init_reply_data(ctx->reply_data, ctx->ops, dev);

	rtnl_lock();

	ret = ctx->ops->prepare_data(ctx->req_info, ctx->reply_data, NULL);
@@ -395,6 +402,10 @@ out: 
	if (ctx->ops->cleanup_data)

		ctx->ops->cleanup_data(ctx->reply_data);

	ctx->reply_data->dev = NULL;

	if (ret < 0)

		genlmsg_cancel(skb, ehdr);

	else

		genlmsg_end(skb, ehdr);

	return ret;

}
@@ -411,7 +422,6 @@ static int ethnl_default_dumpit(struct sk_buff *skb, 
	int s_idx = ctx->pos_idx;

	int h, idx = 0;

	int ret = 0;

	void *ehdr;



	rtnl_lock();

	for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
@@ -431,26 +441,15 @@ restart_chain: 
			dev_hold(dev);

			rtnl_unlock();



			ehdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,

					   cb->nlh->nlmsg_seq,

					   &ethtool_genl_family, 0,

					   ctx->ops->reply_cmd);

			if (!ehdr) {

				dev_put(dev);

				ret = -EMSGSIZE;

				goto out;

			}

			ret = ethnl_default_dump_one(skb, dev, ctx);

			ret = ethnl_default_dump_one(skb, dev, ctx, cb);

			dev_put(dev);

			if (ret < 0) {

				genlmsg_cancel(skb, ehdr);

				if (ret == -EOPNOTSUPP)

					goto lock_and_cont;

				if (likely(skb->len))

					ret = skb->len;

				goto out;

			}

			genlmsg_end(skb, ehdr);

lock_and_cont:

			rtnl_lock();

			if (net->dev_base_seq != seq) {

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