From d687cbb703f50980e155c5642cf229ec2bb45e3e Mon Sep 17 00:00:00 2001 From: =?utf8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Fri, 14 Nov 2014 18:43:28 +0100 Subject: [PATCH] cfg80211: protect fools returning NULL in add_virtual_intf MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Callback add_virtual_intf is supposed to return ERR_PTR and trying to return NULL results in some "Unable to handle kernel paging request", etc. As it may be complicated to debug & trace, let's catch it (WARN). Signed-off-by: Rafał Miłecki Signed-off-by: Johannes Berg --- net/wireless/nl80211.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index dd5a827f9cb0..5cfd75dfff67 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -2645,7 +2645,10 @@ static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info) wdev = rdev_add_virtual_intf(rdev, nla_data(info->attrs[NL80211_ATTR_IFNAME]), type, err ? NULL : &flags, ¶ms); - if (IS_ERR(wdev)) { + if (WARN_ON(!wdev)) { + nlmsg_free(msg); + return -EPROTO; + } else if (IS_ERR(wdev)) { nlmsg_free(msg); return PTR_ERR(wdev); } -- 2.20.1