[PATCH] selinux: use native iterator types

[Christian Göttsche <cgoettsche@xxxxxxxxxxxxx>]

From: Christian Göttsche <cgzones@xxxxxxxxxxxxxx>

Use types for iterators equal to the type of the to be compared values.

Reported by clang:

    security/selinux/ss/sidtab.c:126:2: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare]
      126 |         hash_for_each_rcu(sidtab->context_to_sid, i, entry, list) {
          |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ./include/linux/hashtable.h:139:51: note: expanded from macro 'hash_for_each_rcu'
      139 |         for ((bkt) = 0, obj = NULL; obj == NULL && (bkt) < HASH_SIZE(name);\
          |                                                     ~~~  ^ ~~~~~~~~~~~~~~~

    security/selinux/selinuxfs.c:1520:23: warning: comparison of integers of different signs: 'int' and 'unsigned int' [-Wsign-compare]
     1520 |         for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
          |                          ~~~ ^ ~~~~~~~~~~

    security/selinux/hooks.c:412:16: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare]
      412 |         for (i = 0; i < ARRAY_SIZE(tokens); i++) {
          |                     ~ ^ ~~~~~~~~~~~~~~~~~~

Signed-off-by: Christian Göttsche <cgzones@xxxxxxxxxxxxxx>
---
 security/selinux/hooks.c     | 2 +-
 security/selinux/selinuxfs.c | 2 +-
 security/selinux/ss/sidtab.c | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index ad3abd48eed1..8cab0413df95 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -407,7 +407,7 @@ static const struct {
 
 static int match_opt_prefix(char *s, int l, char **arg)
 {
-	int i;
+	unsigned int i;
 
 	for (i = 0; i < ARRAY_SIZE(tokens); i++) {
 		size_t len = tokens[i].len;
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 234f4789b787..ea563e6215a1 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -1515,7 +1515,7 @@ static const struct file_operations sel_avc_hash_stats_ops = {
 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
 {
-	int cpu;
+	loff_t cpu;
 
 	for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
 		if (!cpu_possible(cpu))
diff --git a/security/selinux/ss/sidtab.c b/security/selinux/ss/sidtab.c
index c8848cbba81f..cb7125cc7f8e 100644
--- a/security/selinux/ss/sidtab.c
+++ b/security/selinux/ss/sidtab.c
@@ -114,12 +114,12 @@ int sidtab_set_initial(struct sidtab *s, u32 sid, struct context *context)
 
 int sidtab_hash_stats(struct sidtab *sidtab, char *page)
 {
-	int i;
+	unsigned int i;
 	int chain_len = 0;
 	int slots_used = 0;
 	int entries = 0;
 	int max_chain_len = 0;
-	int cur_bucket = 0;
+	unsigned int cur_bucket = 0;
 	struct sidtab_entry *entry;
 
 	rcu_read_lock();
-- 
2.45.2