From 40111e108fddaf8b82ff619a2dae77cefc2152db Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Wed, 05 Jul 2023 13:31:42 -0400
Subject: mknod: Share one buffer between two strings

---
diff --git a/helpers/mknod.c b/helpers/mknod.c
index a8bee45..e6bfea8 100644
--- a/helpers/mknod.c
+++ b/helpers/mknod.c
@@ -95,6 +95,7 @@ main(int argc, char *argv[])
 	char           type;
 	long int       major;
 	long int       minor;
+	size_t         specials_file_name_len;
 	char          *specials_file_name;
 	char          *specials_lock_name;
 	int            fd;
@@ -206,19 +207,13 @@ main(int argc, char *argv[])
 		return EXIT_FAILURE;
 	}
 
-	specials_file_name = malloc(strlen(work_area) + strlen("/specials")
-			+ 1 /* "\0" */);
+	specials_file_name_len = strlen(work_area) + strlen("/specials") + 1;
+	specials_file_name = malloc(specials_file_name_len * 2 + 1);
 	if (specials_file_name == NULL) {
 		_err(_("Failed to allocate memory"));
 		return EXIT_FAILURE;
 	}
-	specials_lock_name = malloc(strlen(work_area) + strlen("/specials~")
-			+ 1 /* "\0" */);
-	if (specials_lock_name == NULL) {
-		_err(_("Failed to allocate memory"));
-		free(specials_file_name);
-		return EXIT_FAILURE;
-	}
+	specials_lock_name = specials_file_name + specials_file_name_len ;
 	sprintf(specials_file_name, "%s/specials",  work_area);
 	sprintf(specials_lock_name, "%s/specials~", work_area);
 
@@ -229,7 +224,6 @@ main(int argc, char *argv[])
 	if (fd < 0 || close(fd) < 0) {
 		_err(_("Failed to create node"));
 		free(specials_file_name);
-		free(specials_lock_name);
 		return EXIT_FAILURE;
 	}
 
@@ -243,7 +237,6 @@ main(int argc, char *argv[])
 	}
 	_err(_("Failed to lock specials file"));
 	free(specials_file_name);
-	free(specials_lock_name);
 	unlink(name);
 	return EXIT_FAILURE;
 
@@ -253,7 +246,6 @@ main(int argc, char *argv[])
 		_err(_("Failed to open specials file stream"));
 		close(specials_fd);
 		free(specials_file_name);
-		free(specials_lock_name);
 		unlink(name);
 		return EXIT_FAILURE;
 	}
@@ -264,7 +256,6 @@ main(int argc, char *argv[])
 			_err(_("Failed to stat specials file"));
 			fclose(specials_file);
 			free(specials_file_name);
-			free(specials_lock_name);
 			unlink(name);
 			return EXIT_FAILURE;
 		}
@@ -274,7 +265,6 @@ main(int argc, char *argv[])
 			_err(_("Failed to write specials file"));
 			fclose(specials_file);
 			free(specials_file_name);
-			free(specials_lock_name);
 			unlink(name);
 			return EXIT_FAILURE;
 		}
@@ -284,7 +274,6 @@ main(int argc, char *argv[])
 		_err(_("Failed to write specials file"));
 		fclose(specials_file);
 		free(specials_file_name);
-		free(specials_lock_name);
 		unlink(name);
 		return EXIT_FAILURE;
 	}
@@ -293,13 +282,11 @@ main(int argc, char *argv[])
 	if (rename(specials_lock_name, specials_file_name) != 0) {
 		_err(_("Failed to move specials file"));
 		free(specials_file_name);
-		free(specials_lock_name);
 		unlink(name);
 		return EXIT_FAILURE;
 	}
 
 	free(specials_file_name);
-	free(specials_lock_name);
 
 	return EXIT_SUCCESS;
 }
--
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