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act_ife: acquire ife_mod_lock before reading ifeoplist

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Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong 2016-06-20 13:37:19 -07:00 committed by David S. Miller
parent 067a7cd06f
commit 817e9f2c5c
1 changed files with 8 additions and 6 deletions
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14
net/sched/act_ife.c
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@ -277,7 +277,7 @@ static int load_metaops_and_vet(struct tcf_ife_info *ife, u32 metaid,
* under ife->tcf_lock for existing action
*/
static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
int len, bool exists)
int len, bool atomic)
{
struct tcf_meta_info *mi = NULL;
struct tcf_meta_ops *ops = find_ife_oplist(metaid);
@ -286,7 +286,7 @@ static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
if (!ops)
return -ENOENT;
mi = kzalloc(sizeof(*mi), exists ? GFP_ATOMIC : GFP_KERNEL);
mi = kzalloc(sizeof(*mi), atomic ? GFP_ATOMIC : GFP_KERNEL);
if (!mi) {
/*put back what find_ife_oplist took */
module_put(ops->owner);
@ -296,7 +296,7 @@ static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
mi->metaid = metaid;
mi->ops = ops;
if (len > 0) {
ret = ops->alloc(mi, metaval, exists ? GFP_ATOMIC : GFP_KERNEL);
ret = ops->alloc(mi, metaval, atomic ? GFP_ATOMIC : GFP_KERNEL);
if (ret != 0) {
kfree(mi);
module_put(ops->owner);
@ -309,17 +309,19 @@ static int add_metainfo(struct tcf_ife_info *ife, u32 metaid, void *metaval,
return ret;
}
static int use_all_metadata(struct tcf_ife_info *ife, bool exists)
static int use_all_metadata(struct tcf_ife_info *ife)
{
struct tcf_meta_ops *o;
int rc = 0;
int installed = 0;
read_lock(&ife_mod_lock);
list_for_each_entry(o, &ifeoplist, list) {
rc = add_metainfo(ife, o->metaid, NULL, 0, exists);
rc = add_metainfo(ife, o->metaid, NULL, 0, true);
if (rc == 0)
installed += 1;
}
read_unlock(&ife_mod_lock);
if (installed)
return 0;
@ -523,7 +525,7 @@ metadata_parse_err:
* as we can. You better have at least one else we are
* going to bail out
*/
err = use_all_metadata(ife, exists);
err = use_all_metadata(ife);
if (err) {
if (ret == ACT_P_CREATED)
_tcf_ife_cleanup(a, bind);