D30771.diff
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	diff --git a/contrib/libc-vis/vis.c b/contrib/libc-vis/vis.c
	--- a/contrib/libc-vis/vis.c
	+++ b/contrib/libc-vis/vis.c
	@@ -465,7 +465,8 @@
	while (mbslength > 0) {
	/* Convert one multibyte character to wchar_t. */
	if (!cerr)
	- clen = mbrtowc(src, mbsrc, MB_LEN_MAX, &mbstate);
	+ clen = mbrtowc(src, mbsrc, MIN(mbslength, MB_LEN_MAX),
	+ &mbstate);
	if (cerr \|\| clen < 0) {
	/* Conversion error, process as a byte instead. */
	src = (wint_t)(u_char)mbsrc;