asn1_write_value: fix segfault when deleting an unauthorized element

Segfaults can occur, since value is dereferenced later, ex:

 352       if ((isdigit (value[0])) || (value[0] == '-')

Signed-off-by: Nikos Mavrogiannopoulos <nmav@redhat.com>

diff --git a/lib/element.c b/lib/element.c
index 3e26d84..ee77feb 100644 (file)
--- a/lib/element.c
+++ b/lib/element.c
@@ -303,6 +303,12 @@ asn1_write_value (asn1_node node_root, const char *name,
       return ASN1_SUCCESS;
     }
 
+  /* Don't allow element deletion for other types */
+  if (value == NULL)
+    {
+      return ASN1_VALUE_NOT_VALID;
+    }
+
   switch (type)
     {
     case ASN1_ETYPE_BOOLEAN: