From f205d4efbec3c0d8f5cd5edbc11db6c713a58ca6 Mon Sep 17 00:00:00 2001
From: bdrewery <bdrewery@FreeBSD.org>
Date: Fri, 2 Feb 2018 21:00:06 +0000
Subject: [PATCH] MFC r322894:

  Replace makefs' hand-rolled unescaping with strunvis

Sponsored by:	Dell EMC
---
 usr.sbin/makefs/mtree.c | 50 ++++++++++++++++-------------------------
 1 file changed, 19 insertions(+), 31 deletions(-)

diff --git a/usr.sbin/makefs/mtree.c b/usr.sbin/makefs/mtree.c
index 532b9e41f7a..64bcb3bef21 100644
--- a/usr.sbin/makefs/mtree.c
+++ b/usr.sbin/makefs/mtree.c
@@ -45,6 +45,7 @@ __FBSDID("$FreeBSD$");
 #include <string.h>
 #include <strings.h>
 #include <unistd.h>
+#include <vis.h>
 
 #include "makefs.h"
 
@@ -359,8 +360,6 @@ read_word(FILE *fp, char *buf, size_t bufsz)
 			break;
 		case '\\':
 			esc++;
-			if (esc == 1)
-				continue;
 			break;
 		case '`':
 		case '\'':
@@ -405,33 +404,9 @@ read_word(FILE *fp, char *buf, size_t bufsz)
 				fi->line++;
 			}
 			break;
-		case 'a':
-			if (esc)
-				c = '\a';
-			break;
-		case 'b':
-			if (esc)
-				c = '\b';
-			break;
-		case 'f':
-			if (esc)
-				c = '\f';
-			break;
-		case 'n':
-			if (esc)
-				c = '\n';
-			break;
-		case 'r':
-			if (esc)
-				c = '\r';
-			break;
-		case 't':
-			if (esc)
-				c = '\t';
-			break;
-		case 'v':
+		default:
 			if (esc)
-				c = '\v';
+				buf[idx++] = '\\';
 			break;
 		}
 		buf[idx++] = c;
@@ -607,7 +582,15 @@ read_mtree_keywords(FILE *fp, fsnode *node)
 					error = ENOATTR;
 					break;
 				}
-				node->symlink = strdup(value);
+				node->symlink = malloc(strlen(value) + 1);
+				if (node->symlink == NULL) {
+					error = errno;
+					break;
+				}
+				if (strunvis(node->symlink, value) < 0) {
+					error = errno;
+					break;
+				}
 			} else
 				error = ENOSYS;
 			break;
@@ -987,13 +970,18 @@ read_mtree_spec1(FILE *fp, bool def, const char *name)
 static int
 read_mtree_spec(FILE *fp)
 {
-	char pathspec[PATH_MAX];
+	char pathspec[PATH_MAX], pathtmp[4*PATH_MAX + 1];
 	char *cp;
 	int error;
 
-	error = read_word(fp, pathspec, sizeof(pathspec));
+	error = read_word(fp, pathtmp, sizeof(pathtmp));
 	if (error)
 		goto out;
+	if (strnunvis(pathspec, PATH_MAX, pathtmp) == -1) {
+		error = errno;
+		goto out;
+	}
+	error = 0;
 
 	cp = strchr(pathspec, '/');
 	if (cp != NULL) {
-- 
2.45.0