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Fix several datatype input functions that were allowing unused bytes in their

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results to contain uninitialized, unpredictable values.  While this was okay
as far as the datatypes themselves were concerned, it's a problem for the
parser because occurrences of the "same" literal might not be recognized as
equal by datumIsEqual (and hence not by equal()).  It seems sufficient to fix
this in the input functions since the only critical use of equal() is in the
parser's comparisons of ORDER BY and DISTINCT expressions.
Per a trouble report from Marc Cousin.

Patch all the way back.  Interestingly, array_in did not have the bug before
8.2, which may explain why the issue went unnoticed for so long.
This commit is contained in:
Tom Lane 2008-04-11 22:53:16 +00:00
parent a0f770dbdc
commit 52441adb15
2 changed files with 6 additions and 5 deletions
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7
contrib/ltree/ltree_io.c
View File

@ -117,7 +117,7 @@ ltree_in(PG_FUNCTION_ARGS)
errmsg("syntax error"),
errdetail("Unexpected end of line.")));
result = (ltree *) palloc(LTREE_HDRSIZE + totallen);
result = (ltree *) palloc0(LTREE_HDRSIZE + totallen);
result->len = LTREE_HDRSIZE + totallen;
result->numlevel = lptr - list;
curlevel = LTREE_FIRST(result);
@ -207,8 +207,7 @@ lquery_in(PG_FUNCTION_ARGS)
}
num++;
curqlevel = tmpql = (lquery_level *) palloc(ITEMSIZE * num);
memset((void *) tmpql, 0, ITEMSIZE * num);
curqlevel = tmpql = (lquery_level *) palloc0(ITEMSIZE * num);
ptr = buf;
while (*ptr)
{
@ -447,7 +446,7 @@ lquery_in(PG_FUNCTION_ARGS)
curqlevel = NEXTLEV(curqlevel);
}
result = (lquery *) palloc(totallen);
result = (lquery *) palloc0(totallen);
result->len = totallen;
result->numlevel = num;
result->firstgood = 0;

4
src/backend/utils/adt/geo_ops.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/geo_ops.c,v 1.91.2.1 2007/12/18 00:04:22 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/geo_ops.c,v 1.91.2.2 2008/04/11 22:53:16 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1425,6 +1425,8 @@ path_in(PG_FUNCTION_ARGS)
errmsg("invalid input syntax for type path: \"%s\"", str)));
path->closed = (!isopen);
/* prevent instability in unused pad bytes */
path->dummy = 0;
PG_RETURN_PATH_P(path);
}