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Repair problems with to_char() overrunning its input string. 

From Karel Zak.
This commit is contained in:
Tom Lane 2003-09-03 14:59:41 +00:00
parent 5ac2d7c0eb
commit 5840b89373
1 changed files with 68 additions and 57 deletions
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125
src/backend/utils/adt/formatting.c
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@ -1,7 +1,7 @@
/* ----------------------------------------------------------------------- /* -----------------------------------------------------------------------
* formatting.c * formatting.c
* *
* $Header: /cvsroot/pgsql/src/backend/utils/adt/formatting.c,v 1.67 2003/08/25 16:13:27 tgl Exp $ * $Header: /cvsroot/pgsql/src/backend/utils/adt/formatting.c,v 1.68 2003/09/03 14:59:41 tgl Exp $
* *
* *
* Portions Copyright (c) 1999-2003, PostgreSQL Global Development Group * Portions Copyright (c) 1999-2003, PostgreSQL Global Development Group
@ -1294,6 +1294,16 @@ DCH_processor(FormatNode *node, char *inout, int flag, void *data)
for (n = node, s = inout; n->type != NODE_TYPE_END; n++) for (n = node, s = inout; n->type != NODE_TYPE_END; n++)
{ {
if (flag == FROM_CHAR && *s=='\0')
/*
* The input string is shorter than format picture,
* so it's good time to break this loop...
*
* Note: this isn't relevant for TO_CHAR mode, beacuse
* it use 'inout' allocated by format picture length.
*/
break;
if (n->type == NODE_TYPE_ACTION) if (n->type == NODE_TYPE_ACTION)
{ {
int len; int len;
@ -1328,9 +1338,8 @@ DCH_processor(FormatNode *node, char *inout, int flag, void *data)
} }
} }
} }
++s; /* ! */ ++s; /* ! */
} }
if (flag == TO_CHAR) if (flag == TO_CHAR)
@ -2715,10 +2724,10 @@ datetime_to_char_body(TmToChar *tmtc, text *fmt)
{ {
FormatNode *format; FormatNode *format;
struct tm *tm = NULL; struct tm *tm = NULL;
char *str_fmt, char *fmt_str,
*result; *result;
bool incache; bool incache;
int len = VARSIZE(fmt) - VARHDRSZ; int fmt_len = VARSIZE(fmt) - VARHDRSZ;
tm = tmtcTm(tmtc); tm = tmtcTm(tmtc);
tm->tm_wday = (date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) + 1) % 7; tm->tm_wday = (date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) + 1) % 7;
@ -2727,29 +2736,28 @@ datetime_to_char_body(TmToChar *tmtc, text *fmt)
/* /*
* Convert fmt to C string * Convert fmt to C string
*/ */
str_fmt = (char *) palloc(len + 1); fmt_str = (char *) palloc(fmt_len + 1);
memcpy(str_fmt, VARDATA(fmt), len); memcpy(fmt_str, VARDATA(fmt), fmt_len);
*(str_fmt + len) = '\0'; *(fmt_str + fmt_len) = '\0';
/* /*
* Allocate result * Allocate result
*/ */
result = palloc((len * DCH_MAX_ITEM_SIZ) + 1); result = palloc((fmt_len * DCH_MAX_ITEM_SIZ) + 1);
/* /*
* Allocate new memory if format picture is bigger than static cache * Allocate new memory if format picture is bigger than static cache
* and not use cache (call parser always) - incache=FALSE show this * and not use cache (call parser always)
* variant
*/ */
if (len > DCH_CACHE_SIZE) if (fmt_len > DCH_CACHE_SIZE)
{ {
format = (FormatNode *) palloc((len + 1) * sizeof(FormatNode)); format = (FormatNode *) palloc((fmt_len + 1) * sizeof(FormatNode));
incache = FALSE; incache = FALSE;
parse_format(format, str_fmt, DCH_keywords, parse_format(format, fmt_str, DCH_keywords,
DCH_suff, DCH_index, DCH_TYPE, NULL); DCH_suff, DCH_index, DCH_TYPE, NULL);
(format + len)->type = NODE_TYPE_END; /* Paranoia? */ (format + fmt_len)->type = NODE_TYPE_END; /* Paranoia? */
} }
else else
@ -2758,25 +2766,24 @@ datetime_to_char_body(TmToChar *tmtc, text *fmt)
* Use cache buffers * Use cache buffers
*/ */
DCHCacheEntry *ent; DCHCacheEntry *ent;
incache = TRUE; incache = TRUE;
if ((ent = DCH_cache_search(str_fmt)) == NULL) if ((ent = DCH_cache_search(fmt_str)) == NULL)
{ {
ent = DCH_cache_getnew(str_fmt); ent = DCH_cache_getnew(fmt_str);
/* /*
* Not in the cache, must run parser and save a new * Not in the cache, must run parser and save a new
* format-picture to the cache. * format-picture to the cache.
*/ */
parse_format(ent->format, str_fmt, DCH_keywords, parse_format(ent->format, fmt_str, DCH_keywords,
DCH_suff, DCH_index, DCH_TYPE, NULL); DCH_suff, DCH_index, DCH_TYPE, NULL);
(ent->format + len)->type = NODE_TYPE_END; /* Paranoia? */ (ent->format + fmt_len)->type = NODE_TYPE_END; /* Paranoia? */
#ifdef DEBUG_TO_FROM_CHAR #ifdef DEBUG_TO_FROM_CHAR
/* dump_node(ent->format, len); */ /* dump_node(ent->format, fmt_len); */
/* dump_index(DCH_keywords, DCH_index); */ /* dump_index(DCH_keywords, DCH_index); */
#endif #endif
} }
@ -2788,22 +2795,27 @@ datetime_to_char_body(TmToChar *tmtc, text *fmt)
if (!incache) if (!incache)
pfree(format); pfree(format);
pfree(str_fmt); pfree(fmt_str);
/* /*
* for result is allocated max memory, which current format-picture * for result is allocated max memory, which current format-picture
* needs, now it allocate result with real size * needs, now it allocate result with real size
*/ */
if (!(len = strlen(result))) if (result && *result)
pfree(result);
else
{ {
text *res = (text *) palloc(len + 1 + VARHDRSZ); int len = strlen(result);
if (len)
{
text *res = (text *) palloc(len + 1 + VARHDRSZ);
memcpy(VARDATA(res), result, len); memcpy(VARDATA(res), result, len);
VARATT_SIZEP(res) = len + VARHDRSZ; VARATT_SIZEP(res) = len + VARHDRSZ;
return res; pfree(result);
return res;
}
} }
pfree(result);
return NULL; return NULL;
} }
@ -2953,39 +2965,39 @@ do_to_timestamp(text *date_txt, text *fmt,
{ {
FormatNode *format; FormatNode *format;
TmFromChar tmfc; TmFromChar tmfc;
bool incache; int fmt_len;
char *str;
char *date_str;
int len,
date_len;
ZERO_tm(tm); ZERO_tm(tm);
*fsec = 0; *fsec = 0;
ZERO_tmfc(&tmfc); ZERO_tmfc(&tmfc);
len = VARSIZE(fmt) - VARHDRSZ; fmt_len = VARSIZE(fmt) - VARHDRSZ;
if (len) if (fmt_len)
{ {
str = (char *) palloc(len + 1); int date_len;
memcpy(str, VARDATA(fmt), len); char *fmt_str;
*(str + len) = '\0'; char *date_str;
bool incache;
fmt_str = (char *) palloc(fmt_len + 1);
memcpy(fmt_str, VARDATA(fmt), fmt_len);
*(fmt_str + fmt_len) = '\0';
/* /*
* Allocate new memory if format picture is bigger than static * Allocate new memory if format picture is bigger than static
* cache and not use cache (call parser always) - incache=FALSE * cache and not use cache (call parser always)
* show this variant
*/ */
if (len > DCH_CACHE_SIZE) if (fmt_len > DCH_CACHE_SIZE)
{ {
format = (FormatNode *) palloc((len + 1) * sizeof(FormatNode)); format = (FormatNode *) palloc((fmt_len + 1) * sizeof(FormatNode));
incache = FALSE; incache = FALSE;
parse_format(format, str, DCH_keywords, parse_format(format, fmt_str, DCH_keywords,
DCH_suff, DCH_index, DCH_TYPE, NULL); DCH_suff, DCH_index, DCH_TYPE, NULL);
(format + len)->type = NODE_TYPE_END; /* Paranoia? */ (format + fmt_len)->type = NODE_TYPE_END; /* Paranoia? */
} }
else else
{ {
@ -2993,24 +3005,23 @@ do_to_timestamp(text *date_txt, text *fmt,
* Use cache buffers * Use cache buffers
*/ */
DCHCacheEntry *ent; DCHCacheEntry *ent;
incache = TRUE;
incache = 0; if ((ent = DCH_cache_search(fmt_str)) == NULL)
if ((ent = DCH_cache_search(str)) == NULL)
{ {
ent = DCH_cache_getnew(str); ent = DCH_cache_getnew(fmt_str);
/* /*
* Not in the cache, must run parser and save a new * Not in the cache, must run parser and save a new
* format-picture to the cache. * format-picture to the cache.
*/ */
parse_format(ent->format, str, DCH_keywords, parse_format(ent->format, fmt_str, DCH_keywords,
DCH_suff, DCH_index, DCH_TYPE, NULL); DCH_suff, DCH_index, DCH_TYPE, NULL);
(ent->format + len)->type = NODE_TYPE_END; /* Paranoia? */ (ent->format + fmt_len)->type = NODE_TYPE_END; /* Paranoia? */
#ifdef DEBUG_TO_FROM_CHAR #ifdef DEBUG_TO_FROM_CHAR
/* dump_node(ent->format, len); */ /* dump_node(ent->format, fmt_len); */
/* dump_index(DCH_keywords, DCH_index); */ /* dump_index(DCH_keywords, DCH_index); */
#endif #endif
} }
@ -3021,7 +3032,7 @@ do_to_timestamp(text *date_txt, text *fmt,
* Call action for each node in FormatNode tree * Call action for each node in FormatNode tree
*/ */
#ifdef DEBUG_TO_FROM_CHAR #ifdef DEBUG_TO_FROM_CHAR
/* dump_node(format, len); */ /* dump_node(format, fmt_len); */
#endif #endif
/* /*
@ -3035,8 +3046,8 @@ do_to_timestamp(text *date_txt, text *fmt,
DCH_processor(format, date_str, FROM_CHAR, (void *) &tmfc); DCH_processor(format, date_str, FROM_CHAR, (void *) &tmfc);
pfree(date_str); pfree(date_str);
pfree(str); pfree(fmt_str);
if (incache) if (!incache)
pfree(format); pfree(format);
} }