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net_sched: fix a regression in tcf_proto_lookup_ops()

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list_for_each_entry(t, &tcf_proto_base, head) doesn't
exit with t = NULL if we reached the end of the list.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Fixes: 3627287463b4 ("net_sched: convert tcf_proto_ops to use struct
list_head")
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2013-12-20 10:04:18 -08:00 committed by David S. Miller
parent 568a153a22
commit dcd7608134
1 changed files with 10 additions and 12 deletions
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22
net/sched/cls_api.c
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@ -40,20 +40,20 @@ static DEFINE_RWLOCK(cls_mod_lock);
static const struct tcf_proto_ops *tcf_proto_lookup_ops(struct nlattr *kind) static const struct tcf_proto_ops *tcf_proto_lookup_ops(struct nlattr *kind)
{ {
const struct tcf_proto_ops *t = NULL; const struct tcf_proto_ops *t, *res = NULL;
if (kind) { if (kind) {
read_lock(&cls_mod_lock); read_lock(&cls_mod_lock);
list_for_each_entry(t, &tcf_proto_base, head) { list_for_each_entry(t, &tcf_proto_base, head) {
if (nla_strcmp(kind, t->kind) == 0) { if (nla_strcmp(kind, t->kind) == 0) {
if (!try_module_get(t->owner)) if (try_module_get(t->owner))
t = NULL; res = t;
break; break;
} }
} }
read_unlock(&cls_mod_lock); read_unlock(&cls_mod_lock);
} }
return t; return res;
} }
/* Register(unregister) new classifier type */ /* Register(unregister) new classifier type */
@ -82,15 +82,13 @@ int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
int rc = -ENOENT; int rc = -ENOENT;
write_lock(&cls_mod_lock); write_lock(&cls_mod_lock);
list_for_each_entry(t, &tcf_proto_base, head) list_for_each_entry(t, &tcf_proto_base, head) {
if (t == ops) if (t == ops) {
list_del(&t->head);
rc = 0;
break; break;
}
if (!t) }
goto out;
list_del(&t->head);
rc = 0;
out:
write_unlock(&cls_mod_lock); write_unlock(&cls_mod_lock);
return rc; return rc;
} }