Fix up quote/unquote routines to handle NULL as input, fixes SEGVs in several ACL tools

2 files changed, 6 insertions, 0 deletions

diff --git a/libmisc/quote.c b/libmisc/quote.c
index 633f941..fdd3af9 100644
--- a/libmisc/quote.c
+++ b/libmisc/quote.c
@@ -31,6 +31,9 @@ const char *quote(const char *str)
 	char *q;
 	size_t nonpr;
 	
+	if (!str)
+		return str;
+
 	for (nonpr = 0, s = (unsigned char *)str; *s != '\0'; s++)
 		if (!isprint(*s) || isspace(*s) || *s == '\\')
 			nonpr++;
diff --git a/libmisc/unquote.c b/libmisc/unquote.c
index a3bf6fe..a6992da 100644
--- a/libmisc/unquote.c
+++ b/libmisc/unquote.c
@@ -27,6 +27,9 @@ char *unquote(char *str)
 {
 	unsigned char *s, *t;
 
+	if (!str)
+		return str;
+
 	for (s = (unsigned char *)str; *s != '\0'; s++)
 		if (*s == '\\')
 			break;