8207233: Minor improvements of jdk C-coding

Reviewed-by: rriggs, prr

src/java.base/share/native/libzip/zip_util.c

@@ -739,13 +739,13 @@ ZIP_Open_Generic(const char *name, char **pmsg, int mode, jlong lastModified)
     jzfile *zip = NULL;
 
     /* Clear zip error message */
-    if (pmsg != 0) {
+    if (pmsg != NULL) {
         *pmsg = NULL;
     }
 
     zip = ZIP_Get_From_Cache(name, pmsg, lastModified);
 
-    if (zip == NULL && *pmsg == NULL) {
+    if (zip == NULL && pmsg != NULL && *pmsg == NULL) {
         ZFILE zfd = ZFILE_Open(name, mode);
         zip = ZIP_Put_In_Cache(name, zfd, pmsg, lastModified);
     }

src/java.desktop/unix/native/common/awt/fontpath.c

 /*
- * Copyright (c) 1998, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -265,7 +265,7 @@ static void AddFontsToX11FontPath ( fDirRecord *fDirP )
     }
 
 
-    newFontPath = SAFE_SIZE_ARRAY_ALLOC(malloc, totalDirCount, sizeof ( char **) );
+    newFontPath = SAFE_SIZE_ARRAY_ALLOC(malloc, totalDirCount, sizeof(char *));
     /* if it fails free things and get out */
     if ( newFontPath == NULL ) {
       free ( ( void *) appendDirList );

src/java.smartcardio/share/native/libj2pcsc/pcsc.c

 /*
- * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -192,7 +192,7 @@ JNIEXPORT jobjectArray JNICALL Java_sun_security_smartcardio_PCSC_SCardListReade
     }
     dprintf1("-size: %d\n", size);
 
-    if (size) {
+    if (size != 0) {
         mszReaders = malloc(size);
         if (mszReaders == NULL) {
             throwOutOfMemoryError(env, NULL);
@@ -205,6 +205,8 @@ JNIEXPORT jobjectArray JNICALL Java_sun_security_smartcardio_PCSC_SCardListReade
             return NULL;
         }
         dprintf1("-String: %s\n", mszReaders);
+    } else {
+      return NULL;
     }
 
     result = pcsc_multi2jstring(env, mszReaders);

src/jdk.crypto.ec/share/native/libsunec/impl/ecl_mult.c

 /*
- * Copyright (c) 2007, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
  * This library is free software; you can redistribute it and/or
@@ -80,12 +80,12 @@ ECPoint_mul(const ECGroup *group, const mp_int *k, const mp_int *px,
                                                                  group, timing));
                 }
         } else {
+                kt.flag = (mp_sign)0;
                 if (group->meth->field_enc) {
                         MP_CHECKOK(group->meth->field_enc(px, rx, group->meth));
                         MP_CHECKOK(group->meth->field_enc(py, ry, group->meth));
                         MP_CHECKOK(group->point_mul(&kt, rx, ry, rx, ry, group, timing));
                 } else {
-                        kt.flag = (mp_sign)0;
                         MP_CHECKOK(group->point_mul(&kt, px, py, rx, ry, group, timing));
                 }
         }

src/jdk.jdwp.agent/share/native/libjdwp/transport.c

 /*
- * Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -211,7 +211,7 @@ loadTransport(const char *name, TransportInfo *info)
         JNI_FUNC_PTR(env,GetJavaVM)(env, &jvm);
 
         /* Try version 1.1 first, fallback to 1.0 on error */
-        for (i = 0; i < sizeof(supported_versions); ++i) {
+        for (i = 0; i < sizeof(supported_versions)/sizeof(jint); ++i) {
             rc = (*onLoad)(jvm, &callback, supported_versions[i], &t);
             if (rc != JNI_EVERSION) {
                 info->transportVersion = supported_versions[i];

src/jdk.pack/share/native/common-unpack/unpack.cpp

 /*
- * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -2681,6 +2681,9 @@ void unpacker::attr_definitions::readBandData(int idx) {
     PRINTCR((1, "counted %d [redefined = %d predefined = %d] attributes of type %s.%s",
             count, isRedefined(idx), isPredefined(idx),
             ATTR_CONTEXT_NAME[attrc], lo->name));
+  } else {
+    abort("layout_definition pointer must not be NULL");
+    return;
   }
   bool hasCallables = lo->hasCallables();
   band** bands = lo->bands();

src/jdk.security.auth/unix/native/libjaas/Unix.c

 /*
- * Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -64,6 +64,9 @@ Java_com_sun_security_auth_module_UnixSystem_getUnixInfo
     jclass cls;
 
     numSuppGroups = getgroups(0, NULL);
+    if (numSuppGroups == -1) {
+        return;
+    }
     groups = (gid_t *)calloc(numSuppGroups, sizeof(gid_t));
     if (groups == NULL) {
         jclass cls = (*env)->FindClass(env,"java/lang/OutOfMemoryError");