Merge branch 'nd/config-misc-fixes' into maint

Leakage of lockfiles in the config subsystem has been fixed.

* nd/config-misc-fixes:
  config.c: handle lock file in error case in git_config_rename_...
  config.c: rename label unlock_and_out
  config.c: handle error case for fstat() calls

Author: gitster

config.c

@@ -2216,7 +2216,12 @@ int git_config_set_multivar_in_file_gently(const char *config_filename,
 			goto out_free;
 		}
 
-		fstat(in_fd, &st);
+		if (fstat(in_fd, &st) == -1) {
+			error_errno(_("fstat on %s failed"), config_filename);
+			ret = CONFIG_INVALID_FILE;
+			goto out_free;
+		}
+
 		contents_sz = xsize_t(st.st_size);
 		contents = xmmap_gently(NULL, contents_sz, PROT_READ,
 					MAP_PRIVATE, in_fd, 0);
@@ -2418,7 +2423,7 @@ int git_config_rename_section_in_file(const char *config_filename,
 
 	if (new_name && !section_name_is_ok(new_name)) {
 		ret = error("invalid section name: %s", new_name);
-		goto out;
+		goto out_no_rollback;
 	}
 
 	if (!config_filename)
@@ -2433,10 +2438,13 @@ int git_config_rename_section_in_file(const char *config_filename,
 
 	if (!(config_file = fopen(config_filename, "rb"))) {
 		/* no config file means nothing to rename, no error */
-		goto unlock_and_out;
+		goto commit_and_out;
 	}
 
-	fstat(fileno(config_file), &st);
+	if (fstat(fileno(config_file), &st) == -1) {
+		ret = error_errno(_("fstat on %s failed"), config_filename);
+		goto out;
+	}
 
 	if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
 		ret = error_errno("chmod on %s failed",
@@ -2492,11 +2500,13 @@ int git_config_rename_section_in_file(const char *config_filename,
 		}
 	}
 	fclose(config_file);
-unlock_and_out:
+commit_and_out:
 	if (commit_lock_file(lock) < 0)
 		ret = error_errno("could not write config file %s",
 				  config_filename);
 out:
+	rollback_lock_file(lock);
+out_no_rollback:
 	free(filename_buf);
 	return ret;
 }