diff --git a/libisofs/aaip-os-freebsd.c b/libisofs/aaip-os-freebsd.c
index 34d26f9..842613b 100644
--- a/libisofs/aaip-os-freebsd.c
+++ b/libisofs/aaip-os-freebsd.c
@@ -755,6 +755,7 @@ static int aaip_extattr_delete_names(char *path, int attrnamespace,
                        -6 support of xattr not enabled at compile time
                        -7 support of ACL not enabled at compile time
                        -8 unsupported xattr namespace
+    ISO_AAIP_ACL_MULT_OBJ multiple entries of user::, group::, other::
 */
 int aaip_set_attr_list(char *path, size_t num_attrs, char **names,
                        size_t *value_lengths, char **values, int flag)
@@ -846,6 +847,8 @@ int aaip_set_attr_list(char *path, size_t num_attrs, char **names,
 
  ret= aaip_decode_acl((unsigned char *) values[i], value_lengths[i],
                       &consumed, NULL, 0, &acl_text_fill, 1);
+ if(ret < -3)
+   goto ex;
  if(ret <= 0)
    {ret= -2; goto ex;}
  acl_text= calloc(acl_text_fill, 1);
@@ -853,6 +856,8 @@ int aaip_set_attr_list(char *path, size_t num_attrs, char **names,
    {ret= -1; goto ex;}
  ret= aaip_decode_acl((unsigned char *) values[i], value_lengths[i],
                       &consumed, acl_text, acl_text_fill, &acl_text_fill, 0);
+ if(ret < -3)
+   goto ex;
  if(ret <= 0)
    {ret= -2; goto ex;} 
  has_default_acl= (ret == 2);
diff --git a/libisofs/aaip-os-linux.c b/libisofs/aaip-os-linux.c
index c631d58..ede44fc 100644
--- a/libisofs/aaip-os-linux.c
+++ b/libisofs/aaip-os-linux.c
@@ -435,6 +435,7 @@ ex:
                        -6 support of xattr not enabled at compile time
                        -7 support of ACL not enabled at compile time
                      ( -8 unsupported xattr namespace )
+    ISO_AAIP_ACL_MULT_OBJ multiple entries of user::, group::, other::
 */
 int aaip_set_attr_list(char *path, size_t num_attrs, char **names,
                        size_t *value_lengths, char **values, int flag)
@@ -521,6 +522,8 @@ int aaip_set_attr_list(char *path, size_t num_attrs, char **names,
                                                              /* "access" ACL */
  ret= aaip_decode_acl((unsigned char *) values[i], value_lengths[i],
                       &consumed, NULL, 0, &acl_text_fill, 1);
+ if(ret < -3)
+   goto ex;
  if(ret <= 0)
    {ret= -2; goto ex;}
  acl_text= calloc(acl_text_fill, 1);
@@ -528,6 +531,8 @@ int aaip_set_attr_list(char *path, size_t num_attrs, char **names,
    {ret= -1; goto ex;}
  ret= aaip_decode_acl((unsigned char *) values[i], value_lengths[i],
                    &consumed, acl_text, acl_text_fill, &acl_text_fill, 0);
+ if(ret < -3)
+   goto ex;
  if(ret <= 0)
    {ret= -2; goto ex;}
  has_default_acl= (ret == 2);
@@ -546,6 +551,8 @@ int aaip_set_attr_list(char *path, size_t num_attrs, char **names,
    ret= aaip_decode_acl((unsigned char *) (values[i] + consumed),
                         value_lengths[i] - consumed, &h_consumed,
                         NULL, 0, &acl_text_fill, 1);
+   if(ret < -3)
+     goto ex;
    if(ret <= 0)
      {ret= -2; goto ex;}
    acl_text= calloc(acl_text_fill, 1);
@@ -554,6 +561,8 @@ int aaip_set_attr_list(char *path, size_t num_attrs, char **names,
    ret= aaip_decode_acl((unsigned char *) (values[i] + consumed),
                         value_lengths[i] - consumed, &h_consumed,
                         acl_text, acl_text_fill, &acl_text_fill, 0);
+   if(ret < -3)
+     goto ex;
    if(ret <= 0)
      {ret= -2; goto ex;}
    ret= aaip_set_acl_text(path, acl_text, 1 | (flag & 32));
diff --git a/libisofs/aaip_0_2.c b/libisofs/aaip_0_2.c
index ba946d7..48062b8 100644
--- a/libisofs/aaip_0_2.c
+++ b/libisofs/aaip_0_2.c
@@ -272,6 +272,7 @@ static ssize_t aaip_encode_acl_text(char *acl_text, mode_t st_mode,
                         -1= out of memory
                         -2= program error with prediction of result size
                         -3= error with conversion of name to uid or gid 
+     ISO_AAIP_ACL_MULT_OBJ= multiple entries of user::, group::, other::
 */
 int aaip_encode_acl(char *acl_text, mode_t st_mode,
                     size_t *result_len, unsigned char **result, int flag)
@@ -282,6 +283,8 @@ int aaip_encode_acl(char *acl_text, mode_t st_mode,
  *result_len= 0;
  bytes= aaip_encode_acl_text(acl_text, st_mode,
                              (size_t) 0, NULL, 1 | (flag & (2 | 4 | 8)));
+ if(bytes < -2)
+   return(bytes);
  if(bytes < 0)
    return((int) bytes - 1);
  if(flag & 1) {
@@ -295,6 +298,8 @@ int aaip_encode_acl(char *acl_text, mode_t st_mode,
  *result_len= bytes;
  bytes= aaip_encode_acl_text(acl_text, st_mode, *result_len, *result,
                              (flag & (2 | 4 | 8)));
+ if(bytes < -2)
+   return(bytes);
  if(bytes < 0)
    return((int) bytes - 1);
  if((size_t) bytes != *result_len) {
@@ -348,6 +353,7 @@ static int aaip_make_aaip_perms(int r, int w, int x)
                         <0 means error 
                         -1: result size overflow
                         -2: conversion errror with user name or group name
+     ISO_AAIP_ACL_MULT_OBJ: multiple entries of user::, group::, other::
 */
 static ssize_t aaip_encode_acl_text(char *acl_text, mode_t st_mode,
                            size_t result_size, unsigned char *result, int flag)
@@ -393,6 +399,13 @@ static ssize_t aaip_encode_acl_text(char *acl_text, mode_t st_mode,
    if(strncmp(rpt, "user:", 5) == 0) {
      if(cpt - rpt == 5) {
        type= Aaip_ACL_USER_OBJ;
+       if (has_u) {
+
+         /* >>> Duplicate u:: entry. */;
+         /* >>> ??? If it matches the previous one: ignore */
+
+         return((int) ISO_AAIP_ACL_MULT_OBJ);
+       }
        has_u++;
      } else {
        if(cpt - (rpt + 5) >= name_size)
@@ -431,6 +444,13 @@ static ssize_t aaip_encode_acl_text(char *acl_text, mode_t st_mode,
    } else if(strncmp(rpt, "group:", 6) == 0) {
      if(cpt - rpt == 6) {
        type= Aaip_ACL_GROUP_OBJ;
+       if (has_g) {
+
+         /* >>> Duplicate g:: entry. */;
+         /* >>> ??? If it matches the previous one: ignore */
+
+         return((int) ISO_AAIP_ACL_MULT_OBJ);
+       }
        has_g++;
      } else {
        if(cpt - (rpt + 6) >= name_size)
@@ -468,6 +488,13 @@ static ssize_t aaip_encode_acl_text(char *acl_text, mode_t st_mode,
      }
    } else if(strncmp(rpt, "other:", 6) == 0) {
      type= Aaip_ACL_OTHER;
+     if (has_o) {
+
+       /* >>> Duplicate o:: entry. */;
+       /* >>> ??? If it matches the previous one: ignore */
+
+       return((int) ISO_AAIP_ACL_MULT_OBJ);
+     }
      has_o++;
    } else if(strncmp(rpt, "mask:", 5) == 0) {
      type= Aaip_ACL_MASK;
@@ -2139,8 +2166,9 @@ int aaip_decode_acl(unsigned char *data, size_t num_data, size_t *consumed,
  }
  ret= 1;
 ex:;
+ *acl_text_fill= w_size;
  if(flag & 1)
-   *acl_text_fill= w_size + 1;
+   (*acl_text_fill)++;
  LIBISO_FREE_MEM(name);
  return(ret);
 }
diff --git a/libisofs/aaip_0_2.h b/libisofs/aaip_0_2.h
index 3b6b574..2c458c7 100644
--- a/libisofs/aaip_0_2.h
+++ b/libisofs/aaip_0_2.h
@@ -56,7 +56,11 @@ size_t aaip_encode(size_t num_attrs, char **names,
                         bit3= check for completeness of list and eventually
                               fill up with entries deduced from st_mode
    @return              >0 means ok
-                        0 means error
+                        <=0 means error
+                        -1= out of memory
+                        -2= program error with prediction of result size
+                        -3= error with conversion of name to uid or gid
+     ISO_AAIP_ACL_MULT_OBJ= multiple entries of user::, group::, other::
 */
 int aaip_encode_acl(char *acl_text, mode_t st_mode,
                     size_t *result_len, unsigned char **result, int flag);
@@ -80,7 +84,7 @@ int aaip_encode_acl(char *acl_text, mode_t st_mode,
                         bit3= check for completeness of list and eventually
                               fill up with entries deduced from st_mode
    @return              >0 means ok
-                        0 means error
+                        <=0 means error, see aaip_encode_acl
 */
 int aaip_encode_both_acl(char *a_acl_text, char *d_acl_text, mode_t st_mode,
                          size_t *result_len, unsigned char **result, int flag);
@@ -496,6 +500,8 @@ int aaip_set_acl_text(char *path, char *text, int flag);
                        -5 error with deleting attributes
                        -6 support of xattr not enabled at compile time
                        -7 support of ACL not enabled at compile time
+                       -8 unsupported xattr namespace
+    ISO_AAIP_ACL_MULT_OBJ multiple entries of user::, group::, other::
 */
 int aaip_set_attr_list(char *path, size_t num_attrs, char **names,
                        size_t *value_lengths, char **values, int flag);
diff --git a/libisofs/fs_local.c b/libisofs/fs_local.c
index cb30ed1..bfd857a 100644
--- a/libisofs/fs_local.c
+++ b/libisofs/fs_local.c
@@ -874,11 +874,13 @@ int iso_local_set_attrs(char *disk_path, size_t num_attrs, char **names,
             return ISO_OUT_OF_MEM;
         if (ret == -2)
             return ISO_AAIP_BAD_AASTRING;
+        if (ret >= -5)
+            return ISO_AAIP_NO_SET_LOCAL;
         if (ret == -6 || ret == -7)
             return ISO_AAIP_NOT_ENABLED;
         if (ret == -8)
             return ISO_AAIP_BAD_ATTR_NAME;
-        return ISO_AAIP_NO_SET_LOCAL;
+        return ret;
     }
     return 1;
 }
diff --git a/libisofs/libisofs.h b/libisofs/libisofs.h
index ff46681..43dc372 100644
--- a/libisofs/libisofs.h
+++ b/libisofs/libisofs.h
@@ -6921,6 +6921,11 @@ int iso_md5_match(char first_md5[16], char second_md5[16]);
 /** Attribute name cannot be represented  (FAILURE, HIGH, -380) */
 #define ISO_AAIP_BAD_ATTR_NAME      0xE830FE84
 
+/** ACL text contains multiple entries of user::, group::, other::
+                                                     (FAILURE, HIGH, -379)  */
+#define ISO_AAIP_ACL_MULT_OBJ       0xE830FE83
+
+
 
 /* Internal developer note: 
    Place new error codes directly above this comment. 
diff --git a/libisofs/messages.c b/libisofs/messages.c
index 86b19e1..5c11a3d 100644
--- a/libisofs/messages.c
+++ b/libisofs/messages.c
@@ -466,6 +466,8 @@ const char *iso_error_to_msg(int errcode)
         return "Rock Ridge path too long";
     case ISO_AAIP_BAD_ATTR_NAME:
         return "Attribute name cannot be represented";
+    case ISO_AAIP_ACL_MULT_OBJ:
+        return "ACL text contains multiple entries of user::, group::, other::";
     default:
         return "Unknown error";
     }
diff --git a/libisofs/node.c b/libisofs/node.c
index 7963a58..721c645 100644
--- a/libisofs/node.c
+++ b/libisofs/node.c
@@ -2149,10 +2149,12 @@ int iso_node_set_acl_text(IsoNode *node, char *access_text, char *default_text,
                 ret = aaip_encode_both_acl(access_text, default_text, st_mode,
                                            &acl_len, &acl, 2 | 8);
         }
-        if (ret <= 0) {
+        if (ret == -1)
             ret = ISO_OUT_OF_MEM;
+        else if (ret <= 0 && ret >= -3)
+            ret = ISO_AAIP_BAD_ACL_TEXT;
+        if (ret <= 0)
             goto ex;
-        }
 
         if(acl == NULL) { /* Delete whole ACL attribute */
             /* Update S_IRWXG by eventual "group::" ACL entry.
@@ -2205,6 +2207,8 @@ int iso_node_set_acl_text(IsoNode *node, char *access_text, char *default_text,
     }
     ret = aaip_encode_both_acl(access_text, default_text,
                                st_mode, &acl_len, &acl, 2 | 8);
+    if (ret < -3)
+        goto ex;
     if (ret <= 0) {
         ret = ISO_AAIP_BAD_ACL_TEXT;
         goto ex;