File 0520-odbc-Fix-stack-corruption-in-get_diagnos-in-odbcserv.patch of Package erlang

From 75ae8bc8efa94103d68cb203c1e81088f9c38d32 Mon Sep 17 00:00:00 2001
From: Jan Chochol <jan.chochol@gooddata.com>
Date: Wed, 19 Dec 2018 08:02:03 +0100
Subject: [PATCH] odbc: Fix stack corruption in get_diagnos in odbcserver

SQLGetDiagRec can fill output buffer and return SQL_SUCCESS_WITH_INFO.
In that case we can not use strcat on diagnos.error_msg as it will write
outside allocated space.
Correctly set acc_errmsg_size in such case.

See also ERL-808 at bugs.erlang.org.
---
 lib/odbc/c_src/odbcserver.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/odbc/c_src/odbcserver.c b/lib/odbc/c_src/odbcserver.c
index 6e8ab5b0c8..fe881a211c 100644
--- a/lib/odbc/c_src/odbcserver.c
+++ b/lib/odbc/c_src/odbcserver.c
@@ -2749,6 +2749,11 @@ static diagnos get_diagnos(SQLSMALLINT handleType, SQLHANDLE handle, Boolean ext
 	    errmsg_buffer_size = errmsg_buffer_size - errmsg_size;
 	    acc_errmsg_size = acc_errmsg_size + errmsg_size;
 	    current_errmsg_pos = current_errmsg_pos + errmsg_size;
+	} else if(result == SQL_SUCCESS_WITH_INFO && errmsg_size >= errmsg_buffer_size) {
+	    memcpy(diagnos.sqlState, current_sql_state, SQL_STATE_SIZE);
+	    diagnos.nativeError = nativeError;
+	    acc_errmsg_size = errmsg_buffer_size;
+	    break;
 	} else {
 	    break;
 	}
-- 
2.16.4