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Fix misuse of StrNCpy to copy and add null to non-null-terminated data.

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Does not work since it fetches one byte beyond the source data, and when
the phase of the moon is wrong, the source data is smack up against the
end of backend memory and you get SIGSEGV.  Don't laugh, this is a fix
for an actual user bug report.
This commit is contained in:
Tom Lane
2000-07-07 21:12:53 +00:00
parent de85dd1d51
commit 65da0d66b4
9 changed files with 56 additions and 43 deletions
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12
src/backend/utils/adt/not_in.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/not_in.c,v 1.23 2000/06/09 01:11:09 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/not_in.c,v 1.24 2000/07/07 21:12:50 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -52,10 +52,12 @@ int4notin(PG_FUNCTION_ARGS)
char my_copy[NAMEDATALEN * 2 + 2];
Datum value;
strlength = VARSIZE(relation_and_attr) - VARHDRSZ + 1;
if (strlength > sizeof(my_copy))
strlength = sizeof(my_copy);
StrNCpy(my_copy, VARDATA(relation_and_attr), strlength);
/* make a null-terminated copy of text */
strlength = VARSIZE(relation_and_attr) - VARHDRSZ;
if (strlength >= sizeof(my_copy))
strlength = sizeof(my_copy)-1;
memcpy(my_copy, VARDATA(relation_and_attr), strlength);
my_copy[strlength] = '\0';
relation = (char *) strtok(my_copy, ".");
attribute = (char *) strtok(NULL, ".");