Tcl Source Code: View Ticket

Ticket UUID:	66da4d4228be65fea83fa7eb4f9e932b7951341d
Title:	Tcl_UtfToExternal buffer overwrite for non-BMP characters using utf-16 encoders
Type:	Bug	Created on:	2024-10-19 15:51:30
Submitter:	apnadkarni	Assigned to:	nobody
Subsystem:	44. UTF-8 Strings	Severity:	Severe
Priority:	5 Medium	Last modified:	2024-10-22 16:59:40
Status:	Closed	Closed by:	apnadkarni
Resolution:	Fixed	Closed on:	2024-10-22 16:59:40
Version:	9.0.0

Description:
UTF-16 encoders write beyond destination space when encoding non-BMP characters. `% set utf8 [binary decode hex 41f09f988042]; encoding convertfrom utf-8 $utf8 A😀B % testencoding Tcl_UtfToExternal utf-16le $utf8 {start end} {} 7 nread nwritten nchars Tcl_UtfToExternal wrote past output buffer`
User Comments:
apnadkarni added on 2024-10-19 16:21:29: Proposed fix in [4574a1e8d3]