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-rw-r--r--net/core/net_namespace.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 7279953342..b36444e381 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -69,12 +69,15 @@ DEFINE_COOKIE(net_cookie);
static struct net_generic *net_alloc_generic(void)
{
+ unsigned int gen_ptrs = READ_ONCE(max_gen_ptrs);
+ unsigned int generic_size;
struct net_generic *ng;
- unsigned int generic_size = offsetof(struct net_generic, ptr[max_gen_ptrs]);
+
+ generic_size = offsetof(struct net_generic, ptr[gen_ptrs]);
ng = kzalloc(generic_size, GFP_KERNEL);
if (ng)
- ng->s.len = max_gen_ptrs;
+ ng->s.len = gen_ptrs;
return ng;
}
@@ -1278,7 +1281,11 @@ static int register_pernet_operations(struct list_head *list,
if (error < 0)
return error;
*ops->id = error;
- max_gen_ptrs = max(max_gen_ptrs, *ops->id + 1);
+ /* This does not require READ_ONCE as writers already hold
+ * pernet_ops_rwsem. But WRITE_ONCE is needed to protect
+ * net_alloc_generic.
+ */
+ WRITE_ONCE(max_gen_ptrs, max(max_gen_ptrs, *ops->id + 1));
}
error = __register_pernet_operations(list, ops);
if (error) {