netlabel: Compiler warning and NULL pointer dereference fix

Fix the two compiler warnings show below.  Thanks to Geert Uytterhoeven for
finding and reporting the problem.

 net/netlabel/netlabel_unlabeled.c:567: warning: 'entry' may be used
   uninitialized in this function
 net/netlabel/netlabel_unlabeled.c:629: warning: 'entry' may be used
   uninitialized in this function

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 90c8506..8c03080 100644 (file)
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -562,7 +562,6 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
                                      const struct in_addr *mask,
                                      struct netlbl_audit *audit_info)
 {
-       int ret_val = 0;
        struct netlbl_af4list *list_entry;
        struct netlbl_unlhsh_addr4 *entry;
        struct audit_buffer *audit_buf;
@@ -577,7 +576,7 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
        if (list_entry != NULL)
                entry = netlbl_unlhsh_addr4_entry(list_entry);
        else
-               ret_val = -ENOENT;
+               entry = NULL;
 
        audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
                                              audit_info);
@@ -588,19 +587,21 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
                                          addr->s_addr, mask->s_addr);
                if (dev != NULL)
                        dev_put(dev);
-               if (entry && security_secid_to_secctx(entry->secid,
-                                                     &secctx,
-                                                     &secctx_len) == 0) {
+               if (entry != NULL &&
+                   security_secid_to_secctx(entry->secid,
+                                            &secctx, &secctx_len) == 0) {
                        audit_log_format(audit_buf, " sec_obj=%s", secctx);
                        security_release_secctx(secctx, secctx_len);
                }
-               audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
+               audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
                audit_log_end(audit_buf);
        }
 
-       if (ret_val == 0)
-               call_rcu(&entry->rcu, netlbl_unlhsh_free_addr4);
-       return ret_val;
+       if (entry == NULL)
+               return -ENOENT;
+
+       call_rcu(&entry->rcu, netlbl_unlhsh_free_addr4);
+       return 0;
 }
 
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
@@ -624,7 +625,6 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
                                      const struct in6_addr *mask,
                                      struct netlbl_audit *audit_info)
 {
-       int ret_val = 0;
        struct netlbl_af6list *list_entry;
        struct netlbl_unlhsh_addr6 *entry;
        struct audit_buffer *audit_buf;
@@ -638,7 +638,7 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
        if (list_entry != NULL)
                entry = netlbl_unlhsh_addr6_entry(list_entry);
        else
-               ret_val = -ENOENT;
+               entry = NULL;
 
        audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
                                              audit_info);
@@ -649,19 +649,21 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
                                          addr, mask);
                if (dev != NULL)
                        dev_put(dev);
-               if (entry && security_secid_to_secctx(entry->secid,
-                                                     &secctx,
-                                                     &secctx_len) == 0) {
+               if (entry != NULL &&
+                   security_secid_to_secctx(entry->secid,
+                                            &secctx, &secctx_len) == 0) {
                        audit_log_format(audit_buf, " sec_obj=%s", secctx);
                        security_release_secctx(secctx, secctx_len);
                }
-               audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
+               audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
                audit_log_end(audit_buf);
        }
 
-       if (ret_val == 0)
-               call_rcu(&entry->rcu, netlbl_unlhsh_free_addr6);
-       return ret_val;
+       if (entry == NULL)
+               return -ENOENT;
+
+       call_rcu(&entry->rcu, netlbl_unlhsh_free_addr6);
+       return 0;
 }
 #endif /* IPv6 */