From 470f77befa60adbebccc30f49bd0507c966c375b Mon Sep 17 00:00:00 2001 From: Michal Kubecek Date: Sun, 10 May 2020 21:04:09 +0200 Subject: [PATCH] ethtool: count header size in reply size estimate As ethnl_request_ops::reply_size handlers do not include common header size into calculated/estimated reply size, it needs to be added in ethnl_default_doit() and ethnl_default_notify() before allocating the message. On the other hand, strset_reply_size() should not add common header size. Fixes: 728480f12442 ("ethtool: default handlers for GET requests") Reported-by: Oleksij Rempel Signed-off-by: Michal Kubecek Signed-off-by: David S. Miller Signed-off-by: hongrongxuan --- net/ethtool/netlink.c | 4 ++-- net/ethtool/strset.c | 1 - 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c index e21cc487899e..e3450b86cd43 100644 --- a/net/ethtool/netlink.c +++ b/net/ethtool/netlink.c @@ -336,7 +336,7 @@ static int ethnl_default_doit(struct sk_buff *skb, struct genl_info *info) ret = ops->reply_size(req_info, reply_data); if (ret < 0) goto err_cleanup; - reply_len = ret; + reply_len = ret + ethnl_reply_header_size(); ret = -ENOMEM; rskb = ethnl_reply_init(reply_len, req_info->dev, ops->reply_cmd, ops->hdr_attr, info, &reply_payload); @@ -582,7 +582,7 @@ static void ethnl_default_notify(struct net_device *dev, unsigned int cmd, ret = ops->reply_size(req_info, reply_data); if (ret < 0) goto err_cleanup; - reply_len = ret; + reply_len = ret + ethnl_reply_header_size(); ret = -ENOMEM; skb = genlmsg_new(reply_len, GFP_KERNEL); if (!skb) diff --git a/net/ethtool/strset.c b/net/ethtool/strset.c index 95eae5c68a52..0eed4e4909ab 100644 --- a/net/ethtool/strset.c +++ b/net/ethtool/strset.c @@ -324,7 +324,6 @@ static int strset_reply_size(const struct ethnl_req_info *req_base, int len = 0; int ret; - len += ethnl_reply_header_size(); for (i = 0; i < ETH_SS_COUNT; i++) { const struct strset_info *set_info = &data->sets[i];