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-rw-r--r--generic/tclStringObj.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/generic/tclStringObj.c b/generic/tclStringObj.c
index 767026d..c106f0e 100644
--- a/generic/tclStringObj.c
+++ b/generic/tclStringObj.c
@@ -1904,6 +1904,11 @@ Tcl_AppendFormatToObj(
width = 0;
if (isdigit(UCHAR(ch))) {
width = strtoul(format, &end, 10);
+ if (width < 0) {
+ msg = overflow;
+ errCode = "OVERFLOW";
+ goto errorMsg;
+ }
format = end;
step = TclUtfToUniChar(format, &ch);
} else if (ch == '*') {