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cfg80211: release station info tidstats where needed

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This fixes memory leaks in cases where we got the station
info but failed sending it out properly.

Fixes: 8689c051a2 ("cfg80211: dynamically allocate per-tid stats for station info")
Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2018-05-18 11:40:44 +02:00
parent 0fdf1493b4
commit 7ea3e110f2
2 changed files with 21 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

13
include/net/cfg80211.h
View file

@ -5710,6 +5710,19 @@ void cfg80211_remain_on_channel_expired(struct wireless_dev *wdev, u64 cookie,
*/
int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp);
/**
* cfg80211_sinfo_release_content - release contents of station info
* @sinfo: the station information
*
* Releases any potentially allocated sub-information of the station
* information, but not the struct itself (since it's typically on
* the stack.)
*/
static inline void cfg80211_sinfo_release_content(struct station_info *sinfo)
{
kfree(sinfo->pertid);
}
/**
* cfg80211_new_sta - notify userspace about station
*

11
net/wireless/nl80211.c
View file

@ -4702,7 +4702,6 @@ static int nl80211_send_station(struct sk_buff *msg, u32 cmd, u32 portid,
}
nla_nest_end(msg, tidsattr);
kfree(sinfo->pertid);
}
nla_nest_end(msg, sinfoattr);
@ -4712,10 +4711,12 @@ static int nl80211_send_station(struct sk_buff *msg, u32 cmd, u32 portid,
sinfo->assoc_req_ies))
goto nla_put_failure;
cfg80211_sinfo_release_content(sinfo);
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
cfg80211_sinfo_release_content(sinfo);
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
@ -4797,8 +4798,10 @@ static int nl80211_get_station(struct sk_buff *skb, struct genl_info *info)
return err;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
if (!msg) {
cfg80211_sinfo_release_content(sinfo);
return -ENOMEM;
}
if (nl80211_send_station(msg, NL80211_CMD_NEW_STATION,
info->snd_portid, info->snd_seq, 0,
@ -14624,8 +14627,10 @@ void cfg80211_del_sta_sinfo(struct net_device *dev, const u8 *mac_addr,
trace_cfg80211_del_sta(dev, mac_addr);
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
if (!msg)
if (!msg) {
cfg80211_sinfo_release_content(sinfo);
return;
}
if (nl80211_send_station(msg, NL80211_CMD_DEL_STATION, 0, 0, 0,
rdev, dev, mac_addr, sinfo) < 0) {