1 files changed, 9 insertions, 8 deletions

diff --git a/src/corelib/io/qfsfileengine.cpp b/src/corelib/io/qfsfileengine.cpp
index b69a5e55a5..d376dc711b 100644
--- a/src/corelib/io/qfsfileengine.cpp
+++ b/src/corelib/io/qfsfileengine.cpp
@@ -132,11 +132,9 @@ void QFSFileEnginePrivate::init()
 #ifdef Q_OS_WIN
     fileAttrib = INVALID_FILE_ATTRIBUTES;
     fileHandle = INVALID_HANDLE_VALUE;
+    mapHandle = INVALID_HANDLE_VALUE;
     cachedFd = -1;
 #endif
-#ifdef Q_USE_DEPRECATED_MAP_API
-    fileMapHandle = INVALID_HANDLE_VALUE;
-#endif
 }
 
 /*!
@@ -329,9 +327,9 @@ bool QFSFileEnginePrivate::openFh(QIODevice::OpenMode openMode, FILE *fh)
         int ret;
         do {
             ret = QT_FSEEK(fh, 0, SEEK_END);
-        } while (ret == -1 && errno == EINTR);
+        } while (ret != 0 && errno == EINTR);
 
-        if (ret == -1) {
+        if (ret != 0) {
             q->setError(errno == EMFILE ? QFile::ResourceError : QFile::OpenError,
                         qt_error_string(int(errno)));
 
@@ -576,20 +574,23 @@ bool QFSFileEnginePrivate::seekFdFh(qint64 pos)
     if (lastIOCommand != QFSFileEnginePrivate::IOFlushCommand && !q->flush())
         return false;
 
+    if (pos < 0 || pos != qint64(QT_OFF_T(pos)))
+        return false;
+
     if (fh) {
         // Buffered stdlib mode.
         int ret;
         do {
             ret = QT_FSEEK(fh, QT_OFF_T(pos), SEEK_SET);
-        } while (ret == -1 && errno == EINTR);
+        } while (ret != 0 && errno == EINTR);
 
-        if (ret == -1) {
+        if (ret != 0) {
             q->setError(QFile::ReadError, qt_error_string(int(errno)));
             return false;
         }
     } else {
         // Unbuffered stdio mode.
-        if (QT_LSEEK(fd, pos, SEEK_SET) == -1) {
+        if (QT_LSEEK(fd, QT_OFF_T(pos), SEEK_SET) == -1) {
             qWarning() << "QFile::at: Cannot set file position" << pos;
             q->setError(QFile::PositionError, qt_error_string(errno));
             return false;