Fix double frees in ecpg.

Michael Meskes · Michael Meskes · commit 8e3f3ab5b85a · 2018-03-14T00:51:58.000+01:00
Patch by Patrick Krecker &lt;patrick@judicata.com&gt;
diff --git a/src/interfaces/ecpg/preproc/ecpg.c b/src/interfaces/ecpg/preproc/ecpg.c
@@ -327,6 +327,7 @@ main(int argc, char *const argv[])
 						fprintf(stderr, _("%s: could not open file \"%s\": %s\n"),
 								progname, output_filename, strerror(errno));
 						free(output_filename);
+						output_filename = NULL;
 						free(input_filename);
 						continue;
 					}
@@ -474,8 +475,10 @@ main(int argc, char *const argv[])
 				}
 			}
 
-			if (output_filename && out_option == 0)
+			if (output_filename && out_option == 0) {
 				free(output_filename);
+				output_filename = NULL;
+			}
 
 			free(input_filename);
 		}

Original file line number	Diff line number	Diff line change
`@@ -327,6 +327,7 @@ main(int argc, char *const argv[])`
`327`	`327`	`fprintf(stderr, _("%s: could not open file \"%s\": %s\n"),`
`328`	`328`	`progname, output_filename, strerror(errno));`
`329`	`329`	`free(output_filename);`
	`330`	`+ output_filename = NULL;`
`330`	`331`	`free(input_filename);`
`331`	`332`	`continue;`
`332`	`333`	`}`
`@@ -474,8 +475,10 @@ main(int argc, char *const argv[])`
`474`	`475`	`}`
`475`	`476`	`}`
`476`	`477`
`477`		`- if (output_filename && out_option == 0)`
	`478`	`+ if (output_filename && out_option == 0) {`
`478`	`479`	`free(output_filename);`
	`480`	`+ output_filename = NULL;`
	`481`	`+ }`
`479`	`482`
`480`	`483`	`free(input_filename);`
`481`	`484`	`}`