diff options
Diffstat (limited to 'src/corelib/io/qfsfileengine_unix.cpp')
| -rw-r--r-- | src/corelib/io/qfsfileengine_unix.cpp | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/src/corelib/io/qfsfileengine_unix.cpp b/src/corelib/io/qfsfileengine_unix.cpp index bf648cdfe0..90ad0126d6 100644 --- a/src/corelib/io/qfsfileengine_unix.cpp +++ b/src/corelib/io/qfsfileengine_unix.cpp @@ -636,6 +636,7 @@ bool QFSFileEngine::setFileTime(const QDateTime &newDate, FileTime time) uchar *QFSFileEnginePrivate::map(qint64 offset, qint64 size, QFile::MemoryMapFlags flags) { + qint64 maxFileOffset = std::numeric_limits<QT_OFF_T>::max(); #if (defined(Q_OS_LINUX) || defined(Q_OS_ANDROID)) && Q_PROCESSOR_WORDSIZE == 4 // The Linux mmap2 system call on 32-bit takes a page-shifted 32-bit // integer so the maximum offset is 1 << (32+12) (the shift is always 12, @@ -644,9 +645,7 @@ uchar *QFSFileEnginePrivate::map(qint64 offset, qint64 size, QFile::MemoryMapFla // and Bionic): all of them do the right shift, but don't confirm that the // result fits into the 32-bit parameter to the kernel. - static qint64 MaxFileOffset = (Q_INT64_C(1) << (32+12)) - 1; -#else - static qint64 MaxFileOffset = std::numeric_limits<QT_OFF_T>::max(); + maxFileOffset = qMin((Q_INT64_C(1) << (32+12)) - 1, maxFileOffset); #endif Q_Q(QFSFileEngine); @@ -655,7 +654,7 @@ uchar *QFSFileEnginePrivate::map(qint64 offset, qint64 size, QFile::MemoryMapFla return 0; } - if (offset < 0 || offset > MaxFileOffset + if (offset < 0 || offset > maxFileOffset || size < 0 || quint64(size) > quint64(size_t(-1))) { q->setError(QFile::UnspecifiedError, qt_error_string(int(EINVAL))); return 0; |