Each file in this commit has a problem where it is possible to dereference

a pointer without that pointer being valid. This commit fixes each instance
of that.

3 files changed, 39 insertions, 11 deletions

diff --git a/noncore/apps/opie-write/qrichtext.cpp b/noncore/apps/opie-write/qrichtext.cpp
index f040f1e..768da44 100644
--- a/noncore/apps/opie-write/qrichtext.cpp
+++ b/noncore/apps/opie-write/qrichtext.cpp
@@ -189,9 +189,12 @@ QTextDeleteCommand::~QTextDeleteCommand()
 QTextCursor *QTextDeleteCommand::execute( QTextCursor *c )
 {
     QTextParagraph *s = doc ? doc->paragAt( id ) : parag;
-    if ( !s ) {
+    if ( !s && doc ) {
 	owarn << "can't locate parag at " << id << ", last parag: " << doc->lastParagraph()->paragId() << "" << oendl; 
 	return 0;
+    } else if ( !doc ) {
+	owarn << "No valid doc" << oendl;
+	return 0;
     }
 
     cursor.setParagraph( s );
@@ -217,9 +220,12 @@ QTextCursor *QTextDeleteCommand::execute( QTextCursor *c )
 QTextCursor *QTextDeleteCommand::unexecute( QTextCursor *c )
 {
     QTextParagraph *s = doc ? doc->paragAt( id ) : parag;
-    if ( !s ) {
+    if ( !s && doc ) {
 	owarn << "can't locate parag at " << id << ", last parag: " << doc->lastParagraph()->paragId() << "" << oendl; 
 	return 0;
+    } else if ( !doc ) {
+	owarn << "No valid doc" << oendl;
+	return 0;
     }
 
     cursor.setParagraph( s );
@@ -233,6 +239,9 @@ QTextCursor *QTextDeleteCommand::unexecute( QTextCursor *c )
 	c->setIndex( index );
 	for ( int i = 0; i < (int)text.size(); ++i )
 	    c->gotoNextLetter();
+    } else {
+	owarn << "No valid cursor" << oendl;
+	return 0;
     }
 
     if ( !styleInformation.isEmpty() ) {
@@ -1392,10 +1401,21 @@ struct Q_EXPORT QTextDocumentTag {
 };
 
 
-#define NEWPAR       do{ if ( !hasNewPar) { \
+#define NEWPAR do { \
+                   if ( !hasNewPar) { \
+                       if ( !curpar ) { \
+                           owarn << "no current paragraph" << oendl; \
+                           return; \
+                       } \
 		    if ( !textEditMode && curpar && curpar->length()>1 && curpar->at( curpar->length()-2)->c == QChar_linesep ) \
 			curpar->remove( curpar->length()-2, 1 ); \
-		    curpar = createParagraph( this, curpar, curpar->next() ); styles.append( vec ); vec = 0;} \
+                       curpar = createParagraph( this, curpar, curpar->next() ); styles.append( vec ); \
+                       if ( !curpar ) { \
+                           owarn << "failed in creating a new paragraph" << oendl; \
+                           return; \
+                       } \
+                       vec = 0; \
+                   } \
 		    hasNewPar = TRUE; \
 		    curpar->rtext = TRUE;  \
 		    curpar->align = curtag.alignment; \
@@ -1403,14 +1423,14 @@ struct Q_EXPORT QTextDocumentTag {
 		    curpar->litem = ( curtag.style->displayMode() == QStyleSheetItem::DisplayListItem ); \
 		    curpar->str->setDirection( (QChar::Direction)curtag.direction ); \
 		    space = TRUE; \
-		    delete vec; vec = new QPtrVector<QStyleSheetItem>( (uint)tags.count() + 1); \
+                   delete vec; \
+                   vec = new QPtrVector<QStyleSheetItem>( (uint)tags.count() + 1); \
 		    int i = 0; \
 		    for ( QValueStack<QTextDocumentTag>::Iterator it = tags.begin(); it != tags.end(); ++it ) \
 			vec->insert( i++, (*it).style ); \
 		    vec->insert( i, curtag.style ); \
 		    }while(FALSE)
 
-
 void QTextDocument::setRichText( const QString &text, const QString &context )
 {
     if ( !context.isEmpty() )
@@ -1895,8 +1915,11 @@ void QTextDocument::setRichTextMarginsInternal( QPtrList< QPtrVector<QStyleSheet
 	}
 
 	int i, mar;
-	QStyleSheetItem* mainStyle = curStyle->size() ? (*curStyle)[curStyle->size()-1] : 0;
-	if ( mainStyle && mainStyle->displayMode() == QStyleSheetItem::DisplayListItem )
+	QStyleSheetItem* mainStyle = (*curStyle)[curStyle->size()-1];
+	if ( !mainStyle )
+	    return;
+
+	if ( mainStyle->displayMode() == QStyleSheetItem::DisplayListItem )
 	    stylesPar->setListItem( TRUE );
 	int numLists = 0;
 	for ( i = 0; i < (int)curStyle->size(); ++i ) {
@@ -5341,7 +5364,7 @@ int QTextFormatterBreakWords::format( QTextDocument *doc, QTextParagraph *parag,
 	if ( c )
 	    lastChr = c->c;
 	// ### next line should not be needed
-	if ( painter )
+	if ( c && painter )
 	    c->format()->setPainter( painter );
 	c = &string->at( i );
 	c->rightToLeft = FALSE;
diff --git a/noncore/settings/networksettings2/opietooth2/OTSDPAttribute.cpp b/noncore/settings/networksettings2/opietooth2/OTSDPAttribute.cpp
index 9069c09..3fd877f 100644
--- a/noncore/settings/networksettings2/opietooth2/OTSDPAttribute.cpp
+++ b/noncore/settings/networksettings2/opietooth2/OTSDPAttribute.cpp
@@ -295,6 +295,9 @@ UUIDVector OTSDPAttribute::getAllUUIDs() {
           subAttributes = getAlternative();
       }
 
+      if (!subAttributes)
+          return 0;
+
       int os;
       for( unsigned int i = 0; i < subAttributes->count(); i++ ) {
         UUIDVector subUUIDs = (*subAttributes)[i]->getAllUUIDs();
diff --git a/noncore/settings/packagemanager/oipkgconfigdlg.cpp b/noncore/settings/packagemanager/oipkgconfigdlg.cpp
index d014378..78a18f7 100644
--- a/noncore/settings/packagemanager/oipkgconfigdlg.cpp
+++ b/noncore/settings/packagemanager/oipkgconfigdlg.cpp
@@ -436,7 +436,9 @@ void OIpkgConfigDlg::initData()
     }
 
     // Get Ipkg execution options
-    int options = m_ipkg->ipkgExecOptions();
+    int options = 0;
+    if ( m_ipkg )
+        options = m_ipkg->ipkgExecOptions();
     if ( options & FORCE_DEPENDS )
         m_optForceDepends->setChecked( true );
     if ( options & FORCE_REINSTALL )
@@ -450,7 +452,7 @@ void OIpkgConfigDlg::initData()
     if ( options & FORCE_VERBOSE_WGET )
         m_optVerboseWget->setChecked( true );
 
-    m_optVerboseIpkg->setCurrentItem( m_ipkg->ipkgExecVerbosity() );
+    m_optVerboseIpkg->setCurrentItem( ( m_ipkg ? m_ipkg->ipkgExecVerbosity() : 0 ) );
 }
 
 void OIpkgConfigDlg::slotServerSelected( int index )