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-rw-r--r--src/corelib/io/qfiledevice.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/corelib/io/qfiledevice.cpp b/src/corelib/io/qfiledevice.cpp
index 4c5ed0aef6..8531d32523 100644
--- a/src/corelib/io/qfiledevice.cpp
+++ b/src/corelib/io/qfiledevice.cpp
@@ -560,7 +560,7 @@ qint64 QFileDevice::writeData(const char *data, qint64 len)
char *writePointer = d->writeBuffer.reserve(len);
if (len == 1)
*writePointer = *data;
- else
+ else if (len)
::memcpy(writePointer, data, len);
return len;
}