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From 11ff9325c1497c5ef1de7cf6fde84e1094eae178 Mon Sep 17 00:00:00 2001
From: Chet Ramey <chet.ramey@case.edu>
Date: Wed, 26 Nov 2025 12:52:29 -0500
Subject: Bash-5.3 patch 8: fix issue with calling mbrtowc too much when
translating ansic-single-quoted strings
--- a/lib/sh/strtrans.c
+++ b/lib/sh/strtrans.c
@@ -55,7 +55,7 @@ ansicstr (const char *string, size_t len
const char *s;
unsigned long v;
size_t clen;
- int mb_cur_max;
+ size_t mb_cur_max;
#if defined (HANDLE_MULTIBYTE)
wchar_t wc;
#endif
@@ -63,7 +63,7 @@ ansicstr (const char *string, size_t len
if (string == 0 || *string == '\0')
return ((char *)0);
- mb_cur_max = MB_CUR_MAX;
+ mb_cur_max = locale_mb_cur_max;
#if defined (HANDLE_MULTIBYTE)
temp = 4*len + 4;
if (temp < 12)
@@ -79,10 +79,14 @@ ansicstr (const char *string, size_t len
{
clen = 1;
#if defined (HANDLE_MULTIBYTE)
- if ((locale_utf8locale && (c & 0x80)) ||
- (locale_utf8locale == 0 && mb_cur_max > 0 && is_basic (c) == 0))
+ /* We read an entire multibyte character at a time if we are in a
+ locale where a backslash can possibly appear as part of a
+ multibyte character. UTF-8 encodings prohibit this. */
+ if (locale_utf8locale == 0 && mb_cur_max > 1 && is_basic (c) == 0)
{
clen = mbrtowc (&wc, s - 1, mb_cur_max, 0);
+ if (MB_NULLWCH (clen))
+ break; /* it apparently can happen */
if (MB_INVALIDCH (clen))
clen = 1;
}
@@ -227,30 +231,24 @@ ansic_quote (const char *str, int flags,
{
char *r, *ret;
const char *s;
- size_t l, rsize;
unsigned char c;
+#if defined (HANDLE_MULTIBYTE)
size_t clen;
int b;
-#if defined (HANDLE_MULTIBYTE)
wchar_t wc;
+ DECLARE_MBSTATE;
#endif
if (str == 0 || *str == 0)
return ((char *)0);
- l = strlen (str);
- rsize = 4 * l + 4;
- r = ret = (char *)xmalloc (rsize);
+ r = ret = (char *)xmalloc (4 * strlen (str) + 4);
*r++ = '$';
*r++ = '\'';
for (s = str; c = *s; s++)
{
- b = 1; /* 1 == add backslash; 0 == no backslash */
- l = 1;
- clen = 1;
-
switch (c)
{
case ESC: c = 'E'; break;
@@ -266,39 +264,42 @@ ansic_quote (const char *str, int flags,
break;
default:
#if defined (HANDLE_MULTIBYTE)
- b = is_basic (c);
- /* XXX - clen comparison to 0 is dicey */
- if ((b == 0 && ((clen = mbrtowc (&wc, s, MB_CUR_MAX, 0)) < 0 || MB_INVALIDCH (clen) || iswprint (wc) == 0)) ||
- (b == 1 && ISPRINT (c) == 0))
-#else
- if (ISPRINT (c) == 0)
-#endif
+ if ((locale_utf8locale && (c & 0x80)) ||
+ (locale_utf8locale == 0 && locale_mb_cur_max > 1 && is_basic (c) == 0))
{
- *r++ = '\\';
- *r++ = TOCHAR ((c >> 6) & 07);
- *r++ = TOCHAR ((c >> 3) & 07);
- *r++ = TOCHAR (c & 07);
- continue;
+ clen = mbrtowc (&wc, s, locale_mb_cur_max, &state);
+ if (MB_NULLWCH (clen))
+ goto quote_end;
+ if (MB_INVALIDCH (clen))
+ INITIALIZE_MBSTATE;
+ else if (iswprint (wc))
+ {
+ for (b = 0; b < (int)clen; b++)
+ *r++ = (unsigned char)s[b];
+ s += clen - 1; /* -1 because of the increment above */
+ continue;
+ }
}
- l = 0;
- break;
+ else
+#endif
+ if (ISPRINT (c))
+ {
+ *r++ = c;
+ continue;
+ }
+
+ *r++ = '\\';
+ *r++ = TOCHAR ((c >> 6) & 07);
+ *r++ = TOCHAR ((c >> 3) & 07);
+ *r++ = TOCHAR (c & 07);
+ continue;
}
- if (b == 0 && clen == 0)
- break;
- if (l)
- *r++ = '\\';
-
- if (clen == 1)
- *r++ = c;
- else
- {
- for (b = 0; b < (int)clen; b++)
- *r++ = (unsigned char)s[b];
- s += clen - 1; /* -1 because of the increment above */
- }
+ *r++ = '\\';
+ *r++ = c;
}
+quote_end:
*r++ = '\'';
*r = '\0';
if (rlen)
@@ -348,7 +349,8 @@ ansic_shouldquote (const char *string)
for (s = string; c = *s; s++)
{
#if defined (HANDLE_MULTIBYTE)
- if (is_basic (c) == 0)
+ if ((locale_utf8locale && (c & 0x80)) ||
+ (locale_utf8locale == 0 && locale_mb_cur_max > 1 && is_basic (c) == 0))
return (ansic_wshouldquote (s));
#endif
if (ISPRINT (c) == 0)
--- a/patchlevel.h
+++ b/patchlevel.h
@@ -25,6 +25,6 @@
regexp `^#define[ ]*PATCHLEVEL', since that's what support/mkversion.sh
looks for to find the patch level (for the sccs version string). */
-#define PATCHLEVEL 7
+#define PATCHLEVEL 8
#endif /* _PATCHLEVEL_H_ */
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