Revert check for file size to a warning in QFile::map

The check, introduced in c66de8a19b558e14097c402480eeabf0b5ec2351,
changes behavior and it is not clear whether we should prevent
mmaping beyond EOF. FWIW, python prevents it.

Leaving a warning in there for now so as not to break applications that
depend on the feature.

Task-number: QTBUG-6008
Reviewed-by: Thiago Macieira
(cherry picked from commit 095c92f03e0c01b878eaa0cd1b7844171ce9241f)

1 files changed, 1 insertions, 1 deletions

diff --git a/src/corelib/io/qfsfileengine_unix.cpp b/src/corelib/io/qfsfileengine_unix.cpp
index 0cc0f0b..17bc448 100644
--- a/src/corelib/io/qfsfileengine_unix.cpp
+++ b/src/corelib/io/qfsfileengine_unix.cpp
@@ -1254,7 +1254,7 @@ uchar *QFSFileEnginePrivate::map(qint64 offset, qint64 size, QFile::MemoryMapFla
     // undefined behavior. Otherwise, let mmap have its say.
     if (doStat()
             && (QT_OFF_T(size) > st.st_size - QT_OFF_T(offset)))
-        return 0;
+        qWarning("QFSFileEngine::map: Mapping a file beyond its size is not portable");
 
     int access = 0;
     if (openMode & QIODevice::ReadOnly) access |= PROT_READ;