From 7f4143effc63ffbfa7593280822e4ca2cd7e0c09 Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@collectd.org>
Date: Thu, 18 Jun 2015 13:36:02 +0200
Subject: [PATCH] Fix "Argument with 'nonnull' attribute passed null" warnings.

---
 src/collectd.c   |  3 ++-
 src/configfile.c | 10 +++++++---
 src/df.c         | 15 ++++++++-------
 src/libvirt.c    |  6 ++++++
 src/table.c      |  3 ++-
 5 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/src/collectd.c b/src/collectd.c
index d2597530..6815cccf 100644
--- a/src/collectd.c
+++ b/src/collectd.c
@@ -384,8 +384,9 @@ static int pidfile_create (void)
 static int pidfile_remove (void)
 {
 	const char *file = global_option_get ("PIDFile");
+	if (file == NULL)
+		return 0;
 
-	DEBUG ("unlink (%s)", (file != NULL) ? file : "<null>");
 	return (unlink (file));
 } /* static int pidfile_remove (const char *file) */
 #endif /* COLLECT_DAEMON */
diff --git a/src/configfile.c b/src/configfile.c
index a337c6f5..c389ad16 100644
--- a/src/configfile.c
+++ b/src/configfile.c
@@ -150,9 +150,12 @@ static int cf_dispatch (const char *type, const char *orig_key,
 	int ret;
 	int i;
 
+	if (orig_key == NULL)
+		return (EINVAL);
+
 	DEBUG ("type = %s, key = %s, value = %s",
 			ESCAPE_NULL(type),
-			ESCAPE_NULL(orig_key),
+			orig_key,
 			ESCAPE_NULL(orig_value));
 
 	if ((cf_cb = cf_search (type)) == NULL)
@@ -193,8 +196,6 @@ static int cf_dispatch (const char *type, const char *orig_key,
 	free (key);
 	free (value);
 
-	DEBUG ("cf_dispatch: return (%i)", ret);
-
 	return (ret);
 } /* int cf_dispatch */
 
@@ -741,6 +742,9 @@ static oconfig_item_t *cf_read_dir (const char *dir,
 		filenames[filenames_num - 1] = sstrdup (name);
 	}
 
+	if (filenames == NULL)
+		return (root);
+
 	qsort ((void *) filenames, filenames_num, sizeof (*filenames),
 			cf_compare_string);
 
diff --git a/src/df.c b/src/df.c
index 3d5a402c..ae09e6b7 100644
--- a/src/df.c
+++ b/src/df.c
@@ -208,10 +208,11 @@ static int df_read (void)
 		uint64_t blk_reserved;
 		uint64_t blk_used;
 
-		if (ignorelist_match (il_device,
-					(mnt_ptr->spec_device != NULL)
-					? mnt_ptr->spec_device
-					: mnt_ptr->device))
+		char const *dev = (mnt_ptr->spec_device != NULL)
+			? mnt_ptr->spec_device
+			: mnt_ptr->device;
+
+		if (ignorelist_match (il_device, dev))
 			continue;
 		if (ignorelist_match (il_mountpoint, mnt_ptr->dir))
 			continue;
@@ -234,10 +235,10 @@ static int df_read (void)
 		if (by_device)
 		{
 			/* eg, /dev/hda1  -- strip off the "/dev/" */
-			if (strncmp (mnt_ptr->spec_device, "/dev/", strlen ("/dev/")) == 0)
-				sstrncpy (disk_name, mnt_ptr->spec_device + strlen ("/dev/"), sizeof (disk_name));
+			if (strncmp (dev, "/dev/", strlen ("/dev/")) == 0)
+				sstrncpy (disk_name, dev + strlen ("/dev/"), sizeof (disk_name));
 			else
-				sstrncpy (disk_name, mnt_ptr->spec_device, sizeof (disk_name));
+				sstrncpy (disk_name, dev, sizeof (disk_name));
 
 			if (strlen(disk_name) < 1)
 			{
diff --git a/src/libvirt.c b/src/libvirt.c
index 87b71e69..6a397db3 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -798,6 +798,9 @@ add_interface_device (virDomainPtr dom, const char *path, const char *address, u
     int new_size = sizeof (interface_devices[0]) * (nr_interface_devices+1);
     char *path_copy, *address_copy, number_string[15];
 
+    if ((path == NULL) || (address == NULL))
+        return EINVAL;
+
     path_copy = strdup (path);
     if (!path_copy) return -1;
 
@@ -833,6 +836,9 @@ ignore_device_match (ignorelist_t *il, const char *domname, const char *devpath)
     char *name;
     int n, r;
 
+    if ((domname == NULL) || (devpath == NULL))
+        return 0;
+
     n = sizeof (char) * (strlen (domname) + strlen (devpath) + 2);
     name = malloc (n);
     if (name == NULL) {
diff --git a/src/table.c b/src/table.c
index 9641c759..a3bacc7a 100644
--- a/src/table.c
+++ b/src/table.c
@@ -278,8 +278,9 @@ static int tbl_config_table (oconfig_item_t *ci)
 	if (NULL == tbl->sep) {
 		log_err ("Table \"%s\" does not specify any separator.", tbl->file);
 		status = 1;
+	} else {
+		strunescape (tbl->sep, strlen (tbl->sep) + 1);
 	}
-	strunescape (tbl->sep, strlen (tbl->sep) + 1);
 
 	if (NULL == tbl->instance) {
 		tbl->instance = sstrdup (tbl->file);
-- 
2.30.2