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>

1 files changed, 20 insertions, 18 deletions

diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index 90c8506a0aac..8c0308032178 100644
--- 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 */