[PATCH net-next 05/14] calipso: annotate data-races around cache sysctls

[Jiayuan Chen <jiayuan.chen@linux.dev>]

calipso_cache_enabled and calipso_cache_bucketsize are read without any
lock while their sysctl handlers update them with WRITE_ONCE(). Add
READ_ONCE() to the readers.

Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
---
 net/ipv6/calipso.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/ipv6/calipso.c b/net/ipv6/calipso.c
index e399a42e30839..5e63212b60163 100644
--- a/net/ipv6/calipso.c
+++ b/net/ipv6/calipso.c
@@ -204,7 +204,7 @@ static int calipso_cache_check(const unsigned char *key,
 	struct calipso_map_cache_entry *prev_entry = NULL;
 	u32 hash;
 
-	if (!calipso_cache_enabled)
+	if (!READ_ONCE(calipso_cache_enabled))
 		return -ENOENT;
 
 	hash = calipso_map_cache_hash(key, key_len);
@@ -269,7 +269,7 @@ static int calipso_cache_add(const unsigned char *calipso_ptr,
 	struct calipso_map_cache_entry *old_entry = NULL;
 	u32 calipso_ptr_len;
 
-	if (!calipso_cache_enabled || calipso_cache_bucketsize <= 0)
+	if (!READ_ONCE(calipso_cache_enabled) || READ_ONCE(calipso_cache_bucketsize) <= 0)
 		return 0;
 
 	calipso_ptr_len = calipso_ptr[1];
@@ -289,7 +289,7 @@ static int calipso_cache_add(const unsigned char *calipso_ptr,
 
 	bkt = entry->hash & (CALIPSO_CACHE_BUCKETS - 1);
 	spin_lock_bh(&calipso_cache[bkt].lock);
-	if (calipso_cache[bkt].size < calipso_cache_bucketsize) {
+	if (calipso_cache[bkt].size < READ_ONCE(calipso_cache_bucketsize)) {
 		list_add(&entry->list, &calipso_cache[bkt].list);
 		calipso_cache[bkt].size += 1;
 	} else {
-- 
2.43.0