From 940d0ac9dbe3fb9d4806e96f006286c2e476deed Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Tue, 11 Jun 2013 16:51:03 +0200 Subject: [PATCH] cfg80211: fix rtnl leak in wiphy dump error cases In two wiphy dump error cases, most often when the dump allocation must be increased, the RTNL is leaked. This quickly results in a complete system lockup. Release the RTNL correctly. Reported-by: Emmanuel Grumbach 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 398ce2c59686..e4028197b75d 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -1541,8 +1541,10 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb) int ifidx = nla_get_u32(tb[NL80211_ATTR_IFINDEX]); netdev = dev_get_by_index(sock_net(skb->sk), ifidx); - if (!netdev) + if (!netdev) { + rtnl_unlock(); return -ENODEV; + } if (netdev->ieee80211_ptr) { dev = wiphy_to_dev( netdev->ieee80211_ptr->wiphy); @@ -1586,6 +1588,7 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb) !skb->len && cb->min_dump_alloc < 4096) { cb->min_dump_alloc = 4096; + rtnl_unlock(); return 1; } idx--; -- GitLab