[PATCH] cpupower: bench: parse.c: fix several resource leaks

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

The error handling in prepare_output has several issues with
resource leaks.  Ensure that filename is free'd and the directory
stream DIR is closed before returning.

Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
 tools/power/cpupower/bench/parse.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/tools/power/cpupower/bench/parse.c 
b/tools/power/cpupower/bench/parse.c
index f503fb5..2d09c92 100644
--- a/tools/power/cpupower/bench/parse.c
+++ b/tools/power/cpupower/bench/parse.c
@@ -81,14 +81,18 @@ FILE *prepare_output(const char *dirname)
 
        len = strlen(dirname) + 30;
        filename = malloc(sizeof(char) * len);
+       if (!filename) {
+               perror("malloc");
+               goto out_dir;
+       }
 
        if (uname(&sysdata) == 0) {
                len += strlen(sysdata.nodename) + strlen(sysdata.release);
                filename = realloc(filename, sizeof(char) * len);
 
-               if (filename == NULL) {
+               if (!filename) {
                        perror("realloc");
-                       return NULL;
+                       goto out_dir;
                }
 
                snprintf(filename, len - 1, "%s/benchmark_%s_%s_%li.log",
@@ -104,12 +108,16 @@ FILE *prepare_output(const char *dirname)
        if (output == NULL) {
                perror("fopen");
                fprintf(stderr, "error: unable to open logfile\n");
+               goto out;
        }
 
        fprintf(stdout, "Logfile: %s\n", filename);
 
-       free(filename);
        fprintf(output, "#round load sleep performance powersave percentage\n");
+out:
+       free(filename);
+out_dir:
+       closedir(dir);
        return output;
 }
 
-- 
2.7.0