[PATCH v2 0/2] MR7013: odbc32: Add null pointer checks.

[Owen Rudge (＠orudge)]

"erwin Data Modeler" crashes under Wine when making ODBC connections (to native ODBC drivers on macOS via iODBC) due to passing in `NULL` values in places. These checks allow execution to proceed successfully.

--
  v2: odbc32: Add null pointer checks to update_result_lengths helpers.
      odbc32: Avoid crashing if str is null in debugstr_sqlstr.

https://gitlab.winehq.org/wine/wine/-/merge_requests/7013

[PATCH v2 1/2] odbc32: Avoid crashing if str is null in debugstr_sqlstr.

[Owen Rudge]

From: Owen Rudge

---
 dlls/odbc32/proxyodbc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/odbc32/proxyodbc.c b/dlls/odbc32/proxyodbc.c
index 62c240b6e90..e19fd179bc4 100644
--- a/dlls/odbc32/proxyodbc.c
+++ b/dlls/odbc32/proxyodbc.c
@@ -1068,7 +1068,7 @@ SQLRETURN WINAPI SQLColAttribute(SQLHSTMT StatementHandle, SQLUSMALLINT ColumnNu

static const char *debugstr_sqlstr( const SQLCHAR *str, SQLSMALLINT len )
 {
-    if (len == SQL_NTS) len = strlen( (const char *)str );
+    if (len == SQL_NTS) len = (str == NULL) ? 0 : strlen( (const char *)str );
     return wine_dbgstr_an( (const char *)str, len );
 }

[PATCH v2 2/2] odbc32: Add null pointer checks to update_result_lengths helpers.

[Owen Rudge]

From: Owen Rudge

---
 dlls/odbc32/proxyodbc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/dlls/odbc32/proxyodbc.c b/dlls/odbc32/proxyodbc.c
index e19fd179bc4..cee20b41f30 100644
--- a/dlls/odbc32/proxyodbc.c
+++ b/dlls/odbc32/proxyodbc.c
@@ -1833,6 +1833,9 @@ SQLRETURN WINAPI SQLExecDirect(SQLHSTMT StatementHandle, SQLCHAR *StatementText,
 static void len_to_user( SQLLEN *ptr, UINT8 *len, UINT row_count, UINT width )
 {
     UINT i;
+
+    if (ptr == NULL) return;
+
     for (i = 0; i < row_count; i++)
     {
         *ptr++ = *(SQLLEN *)(len + i * width);
@@ -1842,6 +1845,9 @@ static void len_to_user( SQLLEN *ptr, UINT8 *len, UINT row_count, UINT width )
 static void len_from_user( UINT8 *len, SQLLEN *ptr, UINT row_count, UINT width )
 {
     UINT i;
+
+    if (ptr == NULL) return;
+
     for (i = 0; i < row_count; i++)
     {
         *(SQLLEN *)(len + i * width) = *ptr++;

[PATCH v2 0/2] MR7013: odbc32: Add null pointer checks. - approved

[Hans Leidekker (＠hans)]

This merge request was approved by Hans Leidekker.