Fix a potential double-free in ecpg.

diff --git a/src/interfaces/ecpg/preproc/pgc.l b/src/interfaces/ecpg/preproc/pgc.l
index 5f876808050f767b69e7b8e60a760e11c27113ef..0dc98f79a85b0470b26b878937ce5a949b28d613 100644 (file)
--- a/src/interfaces/ecpg/preproc/pgc.l
+++ b/src/interfaces/ecpg/preproc/pgc.l
@@ -559,6 +559,7 @@ cppline                     {space}*#([^i][A-Za-z]*|{if}|{ifdef}|{ifndef}|{import})(.*\\{space})*.
                                {
                                        addlit(yytext, yyleng);
                                        free(dolqstart);
+                                       dolqstart = NULL;
                                        BEGIN(SQL);
                                        base_yylval.str = mm_strdup(literalbuf);
                                        return DOLCONST;