From: Christoph M. Becker <cmbecker69@gmx.de>
Date: Wed, 24 Jun 2020 10:03:13 +0000 (+0200)
Subject: Properly initialize displaysize
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=38177dcb421cafef18fd903c6ae170ddc40ae599;p=php

Properly initialize displaysize

From Microsoft's `SQLColAttribute()` documentation[1]:

| Please note that some drivers may only write the lower 32-bit or
| 16-bit of a buffer and leave the higher-order bit unchanged.
| Therefore, applications should initialize the value to 0 before
| calling this function.

[1] <https://docs.microsoft.com/en-us/sql/odbc/reference/syntax/sqlcolattribute-function>
---

diff --git a/ext/pdo_odbc/odbc_stmt.c b/ext/pdo_odbc/odbc_stmt.c
index 610c6121c5..6fd14a6f68 100644
--- a/ext/pdo_odbc/odbc_stmt.c
+++ b/ext/pdo_odbc/odbc_stmt.c
@@ -565,7 +565,7 @@ static int odbc_stmt_describe(pdo_stmt_t *stmt, int colno)
 	RETCODE rc;
 	SWORD	colnamelen;
 	SQLULEN	colsize;
-	SQLLEN displaysize;
+	SQLLEN displaysize = 0;
 
 	rc = SQLDescribeCol(S->stmt, colno+1, S->cols[colno].colname,
 			sizeof(S->cols[colno].colname)-1, &colnamelen,