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-rw-r--r--generic/tclBinary.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/generic/tclBinary.c b/generic/tclBinary.c
index f321b28..8c95305 100644
--- a/generic/tclBinary.c
+++ b/generic/tclBinary.c
@@ -273,10 +273,15 @@ Tcl_SetByteArrayObj(
TclFreeIntRep(objPtr);
Tcl_InvalidateStringRep(objPtr);
+ if (length < 0) {
+ length = 0;
+ }
byteArrayPtr = (ByteArray *) ckalloc(BYTEARRAY_SIZE(length));
byteArrayPtr->used = length;
byteArrayPtr->allocated = length;
- memcpy(byteArrayPtr->bytes, bytes, (size_t) length);
+ if (length && bytes) {
+ memcpy(byteArrayPtr->bytes, bytes, (size_t) length);
+ }
objPtr->typePtr = &tclByteArrayType;
SET_BYTEARRAY(objPtr, byteArrayPtr);