[NET_SCHED]: Propagate nla_parse return value

nla_parse() returns more detailed errno codes, propagate them back on
error.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 4 deletions

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 3b3ff641b6d7..512df9a0a242 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -997,9 +997,17 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt)
         struct htb_sched *q = qdisc_priv(sch);
         struct nlattr *tb[TCA_HTB_INIT + 1];
         struct tc_htb_glob *gopt;
+        int err;
         int i;
-        if (!opt || nla_parse_nested(tb, TCA_HTB_INIT, opt, NULL) ||
-            tb[TCA_HTB_INIT] == NULL ||
+
+        if (!opt)
+                return -EINVAL;
+
+        err = nla_parse_nested(tb, TCA_HTB_INIT, opt, NULL);
+        if (err < 0)
+                return err;
+
+        if (tb[TCA_HTB_INIT] == NULL ||
             nla_len(tb[TCA_HTB_INIT]) < sizeof(*gopt)) {
                 printk(KERN_ERR "HTB: hey probably you have bad tc tool ?\n");
                 return -EINVAL;
@@ -1302,8 +1310,15 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
         struct tc_htb_opt *hopt;
 
         /* extract all subattrs from opt attr */
-        if (!opt || nla_parse_nested(tb, TCA_HTB_RTAB, opt, NULL) ||
-            tb[TCA_HTB_PARMS] == NULL ||
+        if (!opt)
+                goto failure;
+
+        err = nla_parse_nested(tb, TCA_HTB_RTAB, opt, NULL);
+        if (err < 0)
+                goto failure;
+
+        err = -EINVAL;
+        if (tb[TCA_HTB_PARMS] == NULL ||
             nla_len(tb[TCA_HTB_PARMS]) < sizeof(*hopt))
                 goto failure;