6872 zfs libraries should not allow uninitialized variables

Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Prakash Surya <prakash.surya@delphix.com>
Reviewed by: Yuri Pankov <yuri.pankov@nexenta.com>
Approved by: Robert Mustacchi <rm@joyent.com>

usr/src/cmd/zfs/Makefile

@@ -22,7 +22,7 @@
 # Use is subject to license terms.
 #
 # Copyright 2010 Nexenta Systems, Inc. All rights reserved.
-# Copyright (c) 2012 by Delphix. All rights reserved.
+# Copyright (c) 2012, 2015 by Delphix. All rights reserved.
 # Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>.
 #
 
@@ -51,8 +51,8 @@ CPPFLAGS += -D_LARGEFILE64_SOURCE=1 -D_REENTRANT $(INCS)
 $(NOT_RELEASE_BUILD)CPPFLAGS += -DDEBUG
 
 # lint complains about unused _umem_* functions
-LINTFLAGS += -xerroff=E_NAME_DEF_NOT_USED2 
-LINTFLAGS64 += -xerroff=E_NAME_DEF_NOT_USED2 
+LINTFLAGS += -xerroff=E_NAME_DEF_NOT_USED2
+LINTFLAGS64 += -xerroff=E_NAME_DEF_NOT_USED2
 
 ROOTUSRSBINLINKS = $(PROG:%=$(ROOTUSRSBIN)/%)
 USRLIBFSTYPELINKS = $(LINKPROGS:%=$(USRLIBFSTYPE)/%)

usr/src/cmd/zpool/Makefile

@@ -21,6 +21,7 @@
 #
 # Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 # Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>.
+# Copyright (c) 2015 by Delphix. All rights reserved.
 #
 
 PROG= zpool
@@ -46,8 +47,8 @@ CPPFLAGS += -D_LARGEFILE64_SOURCE=1 -D_REENTRANT $(INCS)
 $(NOT_RELEASE_BUILD)CPPFLAGS += -DDEBUG
 
 # lint complains about unused _umem_* functions
-LINTFLAGS += -xerroff=E_NAME_DEF_NOT_USED2 
-LINTFLAGS64 += -xerroff=E_NAME_DEF_NOT_USED2  
+LINTFLAGS += -xerroff=E_NAME_DEF_NOT_USED2
+LINTFLAGS64 += -xerroff=E_NAME_DEF_NOT_USED2
 
 ROOTUSRSBINLINKS = $(PROG:%=$(ROOTUSRSBIN)/%)
 

usr/src/cmd/zpool/zpool_vdev.c

@@ -21,7 +21,7 @@
 
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2013 by Delphix. All rights reserved.
+ * Copyright (c) 2013, 2015 by Delphix. All rights reserved.
  * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>.
  */
 
@@ -558,7 +558,6 @@ get_replication(nvlist_t *nvroot, boolean_t fatal)
 	verify(nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN,
 	    &top, &toplevels) == 0);
 
-	lastrep.zprl_type = NULL;
 	for (t = 0; t < toplevels; t++) {
 		uint64_t is_log = B_FALSE;
 

usr/src/lib/libzfs/Makefile.com

@@ -20,7 +20,7 @@
 #
 #
 # Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
-# Copyright (c) 2011, 2014 by Delphix. All rights reserved.
+# Copyright (c) 2011, 2015 by Delphix. All rights reserved.
 #
 
 LIBRARY= libzfs.a
@@ -77,7 +77,6 @@ $(DYNLIB) := LDLIBS +=	-lz
 
 CERRWARN +=	-_gcc=-Wno-switch
 CERRWARN +=	-_gcc=-Wno-parentheses
-CERRWARN +=	-_gcc=-Wno-uninitialized
 CERRWARN +=	-_gcc=-Wno-unused-function
 
 SRCS=	$(OBJS_COMMON:%.o=$(SRCDIR)/%.c)	\

usr/src/lib/libzfs/common/libzfs_dataset.c

@@ -1546,7 +1546,7 @@ zfs_prop_set_list(zfs_handle_t *zhp, nvlist_t *props)
 	libzfs_handle_t *hdl = zhp->zfs_hdl;
 	nvlist_t *nvl;
 	int nvl_len;
-	int added_resv;
+	int added_resv = 0;
 
 	(void) snprintf(errbuf, sizeof (errbuf),
 	    dgettext(TEXT_DOMAIN, "cannot set property for '%s'"),
@@ -3140,7 +3140,7 @@ zfs_create_ancestors(libzfs_handle_t *hdl, const char *path)
 {
 	int prefix;
 	char *path_copy;
-	int rc;
+	int rc = 0;
 
 	if (check_parents(hdl, path, NULL, B_TRUE, &prefix) != 0)
 		return (-1);
@@ -3779,7 +3779,7 @@ zfs_rollback(zfs_handle_t *zhp, zfs_handle_t *snap, boolean_t force)
 	rollback_data_t cb = { 0 };
 	int err;
 	boolean_t restore_resv = 0;
-	uint64_t old_volsize, new_volsize;
+	uint64_t old_volsize = 0, new_volsize;
 	zfs_prop_t resv_prop;
 
 	assert(zhp->zfs_type == ZFS_TYPE_FILESYSTEM ||
@@ -3968,6 +3968,7 @@ zfs_rename(zfs_handle_t *zhp, const char *target, boolean_t recursive,
 			    "child dataset with inherited mountpoint is used "
 			    "in a non-global zone"));
 			(void) zfs_error(hdl, EZFS_ZONED, errbuf);
+			ret = -1;
 			goto error;
 		}
 

usr/src/lib/libzfs/common/libzfs_import.c

@@ -21,7 +21,7 @@
 
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2013 by Delphix. All rights reserved.
+ * Copyright (c) 2012, 2015 by Delphix. All rights reserved.
  * Copyright 2015 RackTop Systems.
  * Copyright 2016 Nexenta Systems, Inc.
  */
@@ -438,12 +438,12 @@ get_configs(libzfs_handle_t *hdl, pool_list_t *pl, boolean_t active_ok)
 	pool_entry_t *pe;
 	vdev_entry_t *ve;
 	config_entry_t *ce;
-	nvlist_t *ret = NULL, *config = NULL, *tmp, *nvtop, *nvroot;
+	nvlist_t *ret = NULL, *config = NULL, *tmp = NULL, *nvtop, *nvroot;
 	nvlist_t **spares, **l2cache;
 	uint_t i, nspares, nl2cache;
 	boolean_t config_seen;
 	uint64_t best_txg;
-	char *name, *hostname;
+	char *name, *hostname = NULL;
 	uint64_t guid;
 	uint_t children = 0;
 	nvlist_t **child = NULL;

usr/src/lib/libzfs/common/libzfs_util.c

@@ -967,7 +967,7 @@ zprop_print_one_property(const char *name, zprop_get_cbdata_t *cbp,
     const char *source, const char *recvd_value)
 {
 	int i;
-	const char *str;
+	const char *str = NULL;
 	char buf[128];
 
 	/*

usr/src/lib/libzfs_jni/Makefile.com

@@ -23,6 +23,10 @@
 # Use is subject to license terms.
 #
 
+#
+# Copyright (c) 2015 by Delphix. All rights reserved.
+#
+
 LIBRARY= libzfs_jni.a
 VERS= .1
 
@@ -45,7 +49,6 @@ LDLIBS +=	-lc -lnvpair -ldiskmgt -lzfs
 CPPFLAGS +=	$(INCS)
 $(NOT_RELEASE_BUILD) CPPFLAGS += -DDEBUG
 CERRWARN +=	-_gcc=-Wno-switch
-CERRWARN +=	-_gcc=-Wno-uninitialized
 
 SRCDIR =	../common
 $(LINTLIB) := SRCS=	$(SRCDIR)/$(LINTSRC)

usr/src/lib/libzfs_jni/common/libzfs_jni_diskmgt.c

@@ -24,7 +24,9 @@
  * Use is subject to license terms.
  */
 
-#pragma ident	"%Z%%M%	%I%	%E% SMI"
+/*
+ * Copyright (c) 2015 by Delphix. All rights reserved.
+ */
 
 #include "libzfs_jni_diskmgt.h"
 #include "libzfs_jni_util.h"
@@ -68,7 +70,7 @@ static void (*error_func)(const char *, va_list);
 static char *
 get_device_name(dm_descriptor_t device, int *error)
 {
-	char *dup;
+	char *dup = NULL;
 	char *name;
 
 	*error = 0;
@@ -120,7 +122,7 @@ get_disk(dm_descriptor_t disk, int *error)
 				/* Get media */
 				dm_descriptor_t *media =
 				    dm_get_associated_descriptors(disk,
-					DM_MEDIA, error);
+				    DM_MEDIA, error);
 				if (*error != 0 || media == NULL ||
 				    *media == NULL) {
 					handle_error(
@@ -136,9 +138,9 @@ get_disk(dm_descriptor_t disk, int *error)
 						/* Get free slices */
 						dp->slices =
 						    get_disk_usable_slices(
-							media[0], dp->name,
-							dp->blocksize,
-							&(dp->in_use), error);
+						    media[0], dp->name,
+						    dp->blocksize,
+						    &(dp->in_use), error);
 					}
 					dm_free_descriptors(media);
 				}
@@ -175,7 +177,8 @@ get_disk_aliases(dm_descriptor_t disk, char *name, int *error)
 		int j;
 
 		/* Count aliases */
-		for (j = 0; aliases[j] != NULL; j++);
+		for (j = 0; aliases[j] != NULL; j++)
+			;
 
 		names = (char **)calloc(j + 1, sizeof (char *));
 		if (names == NULL) {
@@ -369,7 +372,8 @@ get_disk_usable_slices(dm_descriptor_t media, const char *name,
 	if (slices != NULL) {
 		int i, nslices;
 
-		for (nslices = 0; slices[nslices] != NULL; nslices++);
+		for (nslices = 0; slices[nslices] != NULL; nslices++)
+			;
 
 		/* Prune slices based on use */
 		for (i = nslices - 1; i >= 0; i--) {
@@ -386,7 +390,7 @@ get_disk_usable_slices(dm_descriptor_t media, const char *name,
 
 			s_in_use = slice_in_use(slice, error);
 			if (*error) {
-			    break;
+				break;
 			}
 
 			if (s_in_use) {
@@ -627,7 +631,7 @@ slice_too_small(dmgt_slice_t *slice)
 	if (slice->size < SPA_MINDEVSIZE) {
 #ifdef DEBUG
 		(void) fprintf(stderr, "can't use %s: slice too small: %llu\n",
-			slice->name, (unsigned long long)slice->size);
+		    slice->name, (unsigned long long)slice->size);
 #endif
 		return (1);
 	}

usr/src/lib/libzpool/Makefile.com

@@ -20,7 +20,7 @@
 #
 #
 # Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
-# Copyright (c) 2013 by Delphix. All rights reserved.
+# Copyright (c) 2013, 2015 by Delphix. All rights reserved.
 #
 
 LIBRARY= libzpool.a
@@ -71,7 +71,6 @@ CERRWARN +=	-_gcc=-Wno-parentheses
 CERRWARN +=	-_gcc=-Wno-switch
 CERRWARN +=	-_gcc=-Wno-type-limits
 CERRWARN +=	-_gcc=-Wno-unused-variable
-CERRWARN +=	-_gcc=-Wno-uninitialized
 CERRWARN +=	-_gcc=-Wno-empty-body
 CERRWARN +=	-_gcc=-Wno-unused-function
 CERRWARN +=	-_gcc=-Wno-unused-label