diff --git a/library/pem.c b/library/pem.c
index 2775ef9..3dd3b79 100644
--- a/library/pem.c
+++ b/library/pem.c
@@ -370,11 +370,8 @@
 
 void pem_free( pem_context *ctx )
 {
-    if( ctx->buf )
-        polarssl_free( ctx->buf );
-
-    if( ctx->info )
-        polarssl_free( ctx->info );
+    polarssl_free( ctx->buf );
+    polarssl_free( ctx->info );
 
     memset( ctx, 0, sizeof( pem_context ) );
 }
diff --git a/library/ssl_cache.c b/library/ssl_cache.c
index 9e49b9a..836b685 100644
--- a/library/ssl_cache.c
+++ b/library/ssl_cache.c
@@ -321,8 +321,7 @@
         ssl_session_free( &prv->session );
 
 #if defined(POLARSSL_X509_CRT_PARSE_C)
-        if( prv->peer_cert.p != NULL )
-            polarssl_free( prv->peer_cert.p );
+        polarssl_free( prv->peer_cert.p );
 #endif /* POLARSSL_X509_CRT_PARSE_C */
 
         polarssl_free( prv );
diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index 5152895..53b3179 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -691,7 +691,7 @@
 static int ssl_parse_alpn_ext( ssl_context *ssl,
                                unsigned char *buf, size_t len )
 {
-    size_t list_len, cur_len;
+    size_t list_len, cur_len, ours_len;
     const unsigned char *theirs, *start, *end;
     const char **ours;
 
@@ -722,6 +722,7 @@
     end = buf + len;
     for( ours = ssl->alpn_list; *ours != NULL; ours++ )
     {
+        ours_len = strlen( *ours );
         for( theirs = start; theirs != end; theirs += cur_len )
         {
             /* If the list is well formed, we should get equality first */
@@ -734,7 +735,7 @@
             if( cur_len == 0 )
                 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
 
-            if( cur_len == strlen( *ours ) &&
+            if( cur_len == ours_len &&
                 memcmp( theirs, *ours, cur_len ) == 0 )
             {
                 ssl->alpn_chosen = *ours;
diff --git a/library/x509_crt.c b/library/x509_crt.c
index 7946068..54e76db 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -1550,12 +1550,12 @@
 static int x509_wildcard_verify( const char *cn, x509_buf *name )
 {
     size_t i;
-    size_t cn_idx = 0;
+    size_t cn_idx = 0, cn_len = strlen( cn );
 
     if( name->len < 3 || name->p[0] != '*' || name->p[1] != '.' )
         return( 0 );
 
-    for( i = 0; i < strlen( cn ); ++i )
+    for( i = 0; i < cn_len; ++i )
     {
         if( cn[i] == '.' )
         {
@@ -1567,7 +1567,7 @@
     if( cn_idx == 0 )
         return( 0 );
 
-    if( strlen( cn ) - cn_idx == name->len - 1 &&
+    if( cn_len - cn_idx == name->len - 1 &&
         x509_name_cmp( name->p + 1, cn + cn_idx, name->len - 1 ) == 0 )
     {
         return( 1 );