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Fix de-escaping checks so that we will reject \000 as well as other invalidly

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encoded sequences.  Per discussion of a couple of days ago.
This commit is contained in:
Tom Lane
2009-04-19 21:08:54 +00:00
parent c1c40e580a
commit 22c922269f
2 changed files with 28 additions and 26 deletions
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38
src/backend/parser/scan.l
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@@ -24,7 +24,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/scan.l,v 1.150 2009/04/14 22:18:47 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/scan.l,v 1.151 2009/04/19 21:08:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -60,7 +60,7 @@ bool escape_string_warning = true;
bool standard_conforming_strings = false;
static bool warn_on_first_escape;
static bool saw_high_bit = false;
static bool saw_non_ascii = false;
/*
* literalbuf is used to accumulate literal values when multiple rules
@@ -453,7 +453,7 @@ other .
{xqstart} {
warn_on_first_escape = true;
saw_high_bit = false;
saw_non_ascii = false;
SET_YYLLOC();
if (standard_conforming_strings)
BEGIN(xq);
@@ -463,7 +463,7 @@ other .
}
{xestart} {
warn_on_first_escape = false;
saw_high_bit = false;
saw_non_ascii = false;
SET_YYLLOC();
BEGIN(xe);
startlit();
@@ -477,10 +477,11 @@ other .
<xq,xe>{quotefail} {
yyless(1);
BEGIN(INITIAL);
/* check that the data remains valid if it might have been
/*
* check that the data remains valid if it might have been
* made invalid by unescaping any chars.
*/
if (saw_high_bit)
if (saw_non_ascii)
pg_verifymbstr(literalbuf, literallen, false);
yylval.str = litbufdup();
return SCONST;
@@ -526,16 +527,16 @@ other .
check_escape_warning();
addlitchar(c);
if (IS_HIGHBIT_SET(c))
saw_high_bit = true;
if (c == '\0' || IS_HIGHBIT_SET(c))
saw_non_ascii = true;
}
<xe>{xehexesc} {
unsigned char c = strtoul(yytext+2, NULL, 16);
check_escape_warning();
addlitchar(c);
if (IS_HIGHBIT_SET(c))
saw_high_bit = true;
if (c == '\0' || IS_HIGHBIT_SET(c))
saw_non_ascii = true;
}
<xq,xe,xus>{quotecontinue} {
/* ignore */
@@ -1083,6 +1084,11 @@ litbuf_udeescape(unsigned char escape)
}
*out = '\0';
/*
* We could skip pg_verifymbstr if we didn't process any non-7-bit-ASCII
* codes; but it's probably not worth the trouble, since this isn't
* likely to be a performance-critical path.
*/
pg_verifymbstr(new, out - new, false);
return new;
}
@@ -1090,14 +1096,6 @@ litbuf_udeescape(unsigned char escape)
static unsigned char
unescape_single_char(unsigned char c)
{
/* Normally we wouldn't expect to see \n where n has its high bit set
* but we set the flag to check the string if we do get it, so
* that this doesn't become a way of getting around the coding validity
* checks.
*/
if (IS_HIGHBIT_SET(c))
saw_high_bit = true;
switch (c)
{
case 'b':
@@ -1111,6 +1109,10 @@ unescape_single_char(unsigned char c)
case 't':
return '\t';
default:
/* check for backslash followed by non-7-bit-ASCII */
if (c == '\0' || IS_HIGHBIT_SET(c))
saw_non_ascii = true;
return c;
}
}