net: ncsi: fix a missing check for nla_nest_start

nla_nest_start may fail and thus deserves a check.

The fix returns -EMSGSIZE in case it fails.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ncsi/ncsi-netlink.c b/net/ncsi/ncsi-netlink.c
index 5d78244..bad17bb 100644 (file)
--- a/net/ncsi/ncsi-netlink.c
+++ b/net/ncsi/ncsi-netlink.c
@@ -251,6 +251,10 @@ static int ncsi_pkg_info_all_nl(struct sk_buff *skb,
        }
 
        attr = nla_nest_start(skb, NCSI_ATTR_PACKAGE_LIST);
+       if (!attr) {
+               rc = -EMSGSIZE;
+               goto err;
+       }
        rc = ncsi_write_package_info(skb, ndp, package->id);
        if (rc) {
                nla_nest_cancel(skb, attr);