Fix a potential double-free in ecpg.

Michael Meskes · Michael Meskes · commit d1ca82d0a226 · 2017-03-10T10:32:41.000+01:00
diff --git a/src/interfaces/ecpg/preproc/pgc.l b/src/interfaces/ecpg/preproc/pgc.l
@@ -565,6 +565,7 @@ cppline			{space}*#([^i][A-Za-z]*|{if}|{ifdef}|{ifndef}|{import})((\/\*[^*/]*\*+
 				{
 					addlit(yytext, yyleng);
 					free(dolqstart);
+					dolqstart = NULL;
 					BEGIN(SQL);
 					base_yylval.str = mm_strdup(literalbuf);
 					return DOLCONST;

Original file line number	Diff line number	Diff line change
`@@ -565,6 +565,7 @@ cppline {space}#([^i][A-Za-z]\|{if}\|{ifdef}\|{ifndef}\|{import})((\/\[^/]\+`
`565`	`565`	`{`
`566`	`566`	`addlit(yytext, yyleng);`
`567`	`567`	`free(dolqstart);`
	`568`	`+ dolqstart = NULL;`
`568`	`569`	`BEGIN(SQL);`
`569`	`570`	`base_yylval.str = mm_strdup(literalbuf);`
`570`	`571`	`return DOLCONST;`