[D][E][F][SRU][PATCH 1/1][CVE-2019-19055] nl80211: fix memory leak in nl80211_get_ftm_responder_stats

[Po-Hsu Lin]

From: Navid Emamdoost <navid.emamdoost at gmail.com>

CVE-2019-19055

In nl80211_get_ftm_responder_stats, a new skb is created via nlmsg_new
named msg. If nl80211hdr_put() fails, then msg should be released. The
return statement should be replace by goto to error handling code.

Fixes: 81e54d08d9d8 ("cfg80211: support FTM responder configuration/statistics")
Signed-off-by: Navid Emamdoost <navid.emamdoost at gmail.com>
Link: https://lore.kernel.org/r/20191004194220.19412-1-navid.emamdoost@gmail.com
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
(cherry picked from commit 1399c59fa92984836db90538cf92397fe7caaa57)
Signed-off-by: Po-Hsu Lin <po-hsu.lin at canonical.com>
---
 net/wireless/nl80211.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index da752ca..f04cb89 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -13521,7 +13521,7 @@ static int nl80211_get_ftm_responder_stats(struct sk_buff *skb,
 	hdr = nl80211hdr_put(msg, info->snd_portid, info->snd_seq, 0,
 			     NL80211_CMD_GET_FTM_RESPONDER_STATS);
 	if (!hdr)
-		return -ENOBUFS;
+		goto nla_put_failure;
 
 	if (nla_put_u32(msg, NL80211_ATTR_IFINDEX, dev->ifindex))
 		goto nla_put_failure;
-- 
2.7.4