[Qemu-devel] [PATCH v3 1/2] bridge helper: unified error cleanup for parse_acl_file

[Doug Goldstein]

Handle errors and cleanup from the error in a unified place for
parse_acl_file().

Signed-off-by: Doug Goldstein <address@hidden>
Reviewed-by: Stefan Hajnoczi <address@hidden>
Reviewed-by: Corey Bryant <address@hidden>
CC: Anthony Liguori <address@hidden>
CC: Richa Marwaha <address@hidden>
CC: Corey Bryant <address@hidden>
TO: address@hidden
---
 qemu-bridge-helper.c | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/qemu-bridge-helper.c b/qemu-bridge-helper.c
index 287bfd5..95486e7 100644
--- a/qemu-bridge-helper.c
+++ b/qemu-bridge-helper.c
@@ -74,11 +74,12 @@ static int parse_acl_file(const char *filename, ACLList 
*acl_list)
 {
     FILE *f;
     char line[4096];
+    int ret = -EINVAL;
     ACLRule *acl_rule;
 
     f = fopen(filename, "r");
     if (f == NULL) {
-        return -1;
+        return -errno;
     }
 
     while (fgets(line, sizeof(line), f) != NULL) {
@@ -102,9 +103,8 @@ static int parse_acl_file(const char *filename, ACLList 
*acl_list)
 
         if (arg == NULL) {
             fprintf(stderr, "Invalid config line:\n  %s\n", line);
-            fclose(f);
-            errno = EINVAL;
-            return -1;
+            ret = -EINVAL;
+            goto failure;
         }
 
         *arg = 0;
@@ -142,15 +142,17 @@ static int parse_acl_file(const char *filename, ACLList 
*acl_list)
             parse_acl_file(arg, acl_list);
         } else {
             fprintf(stderr, "Unknown command `%s'\n", cmd);
-            fclose(f);
-            errno = EINVAL;
-            return -1;
+            ret = -EINVAL;
+            goto failure;
         }
     }
 
+    ret = 0;
+
+failure:
     fclose(f);
 
-    return 0;
+    return ret;
 }
 
 static bool has_vnet_hdr(int fd)
@@ -238,7 +240,7 @@ int main(int argc, char **argv)
     ACLRule *acl_rule;
     ACLList acl_list;
     int access_allowed, access_denied;
-    int ret = EXIT_SUCCESS;
+    int ret;
 
 #ifdef CONFIG_LIBCAP
     /* if we're run from an suid binary, immediately drop privileges preserving
@@ -272,9 +274,10 @@ int main(int argc, char **argv)
 
     /* parse default acl file */
     QSIMPLEQ_INIT(&acl_list);
-    if (parse_acl_file(DEFAULT_ACL_FILE, &acl_list) == -1) {
-        fprintf(stderr, "failed to parse default acl file `%s'\n",
-                DEFAULT_ACL_FILE);
+    ret = parse_acl_file(DEFAULT_ACL_FILE, &acl_list);
+    if (ret < 0) {
+        fprintf(stderr, "failed to parse default acl file `%s': %s\n",
+                DEFAULT_ACL_FILE, strerror(ret));
         ret = EXIT_FAILURE;
         goto cleanup;
     }
@@ -416,6 +419,7 @@ int main(int argc, char **argv)
     /* ... */
 
     /* profit! */
+    ret = EXIT_SUCCESS;
 
 cleanup:
 
-- 
1.8.1.5