r23080: Fix bug #4637 - we hads missed some cases where

we were calling PRS_ALLOC_MEM with zero count.
Jeremy.
(This used to be commit 9a10736e6fa276ca4b0726fbb7baf0daafbdc46d)

7 files changed, 120 insertions, 71 deletions

diff --git a/source3/libads/authdata.c b/source3/libads/authdata.c
index 71294941a6..8e951dde80 100644
--- a/source3/libads/authdata.c
+++ b/source3/libads/authdata.c
@@ -120,10 +120,14 @@ static BOOL pac_io_krb_sid_and_attr_array(const char *desc,
 		return False;
 
 	if (UNMARSHALLING(ps)) {
-		array->krb_sid_and_attrs = PRS_ALLOC_MEM(ps, KRB_SID_AND_ATTRS, num);
-		if (!array->krb_sid_and_attrs) {
-			DEBUG(3, ("No memory available\n"));
-			return False;
+		if (num) {
+			array->krb_sid_and_attrs = PRS_ALLOC_MEM(ps, KRB_SID_AND_ATTRS, num);
+			if (!array->krb_sid_and_attrs) {
+				DEBUG(3, ("No memory available\n"));
+				return False;
+			}
+		} else {
+			array->krb_sid_and_attrs = NULL;
 		}
 	}
 
@@ -184,10 +188,14 @@ static BOOL pac_io_group_membership_array(const char *desc,
 		return False;
 
 	if (UNMARSHALLING(ps)) {
-		array->group_membership = PRS_ALLOC_MEM(ps, GROUP_MEMBERSHIP, num);
-		if (!array->group_membership) {
-			DEBUG(3, ("No memory available\n"));
-			return False;
+		if (num) {
+			array->group_membership = PRS_ALLOC_MEM(ps, GROUP_MEMBERSHIP, num);
+			if (!array->group_membership) {
+				DEBUG(3, ("No memory available\n"));
+				return False;
+			}
+		} else {
+			array->group_membership = NULL;
 		}
 	}
 
@@ -456,10 +464,14 @@ static BOOL pac_io_pac_signature_data(const char *desc,
 		return False;
 
 	if (UNMARSHALLING(ps) && length) {
-		data->signature.buffer = PRS_ALLOC_MEM(ps, uint8, siglen);
-		if (!data->signature.buffer) {
-			DEBUG(3, ("No memory available\n"));
-			return False;
+		if (siglen) {
+			data->signature.buffer = PRS_ALLOC_MEM(ps, uint8, siglen);
+			if (!data->signature.buffer) {
+				DEBUG(3, ("No memory available\n"));
+				return False;
+			}
+		} else {
+			data->signature.buffer = NULL;
 		}
 	}
 
diff --git a/source3/registry/regfio.c b/source3/registry/regfio.c
index 3a554177a4..3e3e7e480c 100644
--- a/source3/registry/regfio.c
+++ b/source3/registry/regfio.c
@@ -642,8 +642,12 @@ static BOOL hbin_prs_lf_records( const char *desc, REGF_HBIN *hbin, int depth, R
 		return False;
 
 	if ( UNMARSHALLING(&hbin->ps) ) {
-		if ( !(lf->hashes = PRS_ALLOC_MEM( &hbin->ps, REGF_HASH_REC, lf->num_keys )) )
-			return False;
+		if (lf->num_keys) {
+			if ( !(lf->hashes = PRS_ALLOC_MEM( &hbin->ps, REGF_HASH_REC, lf->num_keys )) )
+				return False;
+		} else {
+			lf->hashes = NULL;
+		}
 	}
 
 	for ( i=0; i<lf->num_keys; i++ ) {
diff --git a/source3/rpc_parse/parse_lsa.c b/source3/rpc_parse/parse_lsa.c
index 06ccec4ab3..0add8b2bb0 100644
--- a/source3/rpc_parse/parse_lsa.c
+++ b/source3/rpc_parse/parse_lsa.c
@@ -1178,7 +1178,7 @@ static BOOL lsa_io_sid_enum(const char *desc, LSA_SID_ENUM *sen, prs_struct *ps,
 
 	/* Mallocate memory if we're unpacking from the wire */
 
-	if (UNMARSHALLING(ps)) {
+	if (UNMARSHALLING(ps) && sen->num_entries) {
 		if ((sen->ptr_sid = PRS_ALLOC_MEM( ps, uint32, sen->num_entries)) == NULL) {
 			DEBUG(3, ("init_lsa_sid_enum(): out of memory for "
 				  "ptr_sid\n"));
@@ -1361,7 +1361,7 @@ static BOOL lsa_io_trans_names(const char *desc, LSA_TRANS_NAME_ENUM *trn,
 			return False;
 		}
 
-		if (UNMARSHALLING(ps)) {
+		if (UNMARSHALLING(ps) && trn->num_entries2) {
 			if ((trn->name = PRS_ALLOC_MEM(ps, LSA_TRANS_NAME, trn->num_entries2)) == NULL) {
 				return False;
 			}
@@ -1423,7 +1423,7 @@ static BOOL lsa_io_trans_names2(const char *desc, LSA_TRANS_NAME_ENUM2 *trn,
 			return False;
 		}
 
-		if (UNMARSHALLING(ps)) {
+		if (UNMARSHALLING(ps) && trn->num_entries2) {
 			if ((trn->name = PRS_ALLOC_MEM(ps, LSA_TRANS_NAME2, trn->num_entries2)) == NULL) {
 				return False;
 			}
@@ -1700,7 +1700,7 @@ BOOL lsa_io_r_lookup_names(const char *desc, LSA_R_LOOKUP_NAMES *out, prs_struct
 			return False;
 		}
 
-		if (UNMARSHALLING(ps)) {
+		if (UNMARSHALLING(ps) && out->num_entries2) {
 			if ((out->dom_rid = PRS_ALLOC_MEM(ps, DOM_RID, out->num_entries2))
 			    == NULL) {
 				DEBUG(3, ("lsa_io_r_lookup_names(): out of memory\n"));
@@ -1825,7 +1825,7 @@ BOOL lsa_io_r_lookup_names2(const char *desc, LSA_R_LOOKUP_NAMES2 *out, prs_stru
 			return False;
 		}
 
-		if (UNMARSHALLING(ps)) {
+		if (UNMARSHALLING(ps) && out->num_entries2) {
 			if ((out->dom_rid = PRS_ALLOC_MEM(ps, DOM_RID2, out->num_entries2))
 			    == NULL) {
 				DEBUG(3, ("lsa_io_r_lookup_names2(): out of memory\n"));
@@ -1978,7 +1978,7 @@ BOOL lsa_io_r_lookup_names3(const char *desc, LSA_R_LOOKUP_NAMES3 *out, prs_stru
 			return False;
 		}
 
-		if (UNMARSHALLING(ps)) {
+		if (UNMARSHALLING(ps) && out->num_entries2) {
 			if ((out->trans_sids = PRS_ALLOC_MEM(ps, LSA_TRANSLATED_SID3, out->num_entries2))
 			    == NULL) {
 				DEBUG(3, ("lsa_io_r_lookup_names3(): out of memory\n"));
@@ -2107,7 +2107,7 @@ BOOL lsa_io_r_lookup_names4(const char *desc, LSA_R_LOOKUP_NAMES4 *out, prs_stru
 			return False;
 		}
 
-		if (UNMARSHALLING(ps)) {
+		if (UNMARSHALLING(ps) && out->num_entries2) {
 			if ((out->trans_sids = PRS_ALLOC_MEM(ps, LSA_TRANSLATED_SID3, out->num_entries2))
 			    == NULL) {
 				DEBUG(3, ("lsa_io_r_lookup_names4(): out of memory\n"));
@@ -2346,7 +2346,7 @@ BOOL lsa_io_r_enum_privs(const char *desc, LSA_R_ENUM_PRIVS *out, prs_struct *ps
 		if(!prs_uint32("count1", ps, depth, &out->count1))
 			return False;
 
-		if (UNMARSHALLING(ps))
+		if (UNMARSHALLING(ps) && out->count1)
 			if (!(out->privs = PRS_ALLOC_MEM(ps, LSA_PRIV_ENTRY, out->count1)))
 				return False;
 
@@ -3908,7 +3908,7 @@ static BOOL smb_io_lsa_data_buf(const char *desc, LSA_DATA_BUF *buf,
 	prs_debug(ps, depth, desc, "smb_io_lsa_data_buf");
 	depth++;
 
-	if ( UNMARSHALLING(ps) ) {
+	if ( UNMARSHALLING(ps) && length ) {
 		if ( !(buf->data = PRS_ALLOC_MEM( ps, uint8, length )) )
 			return False;
 	}
@@ -3922,7 +3922,7 @@ static BOOL smb_io_lsa_data_buf(const char *desc, LSA_DATA_BUF *buf,
 	if (!prs_uint32("length", ps, depth, &buf->length))
 		return False;
 
-	if(!prs_uint8s(False, "data", ps, depth, buf->data, size))
+	if(!prs_uint8s(False, "data", ps, depth, buf->data, length))
 		return False;
 
 	return True;
diff --git a/source3/rpc_parse/parse_net.c b/source3/rpc_parse/parse_net.c
index 4c2f676831..6e2b2b26e7 100644
--- a/source3/rpc_parse/parse_net.c
+++ b/source3/rpc_parse/parse_net.c
@@ -1813,9 +1813,13 @@ BOOL net_io_user_info3(const char *desc, NET_USER_INFO_3 *usr, prs_struct *ps,
 	}
 
 	if (UNMARSHALLING(ps)) {
-		usr->gids = PRS_ALLOC_MEM(ps, DOM_GID, usr->num_groups);
-		if (usr->gids == NULL)
-			return False;
+		if (usr->num_groups) {
+			usr->gids = PRS_ALLOC_MEM(ps, DOM_GID, usr->num_groups);
+			if (usr->gids == NULL)
+				return False;
+		} else {
+			usr->gids = NULL;
+		}
 	}
 
 	for (i = 0; i < usr->num_groups; i++) {
@@ -1848,10 +1852,15 @@ BOOL net_io_user_info3(const char *desc, NET_USER_INFO_3 *usr, prs_struct *ps,
 			return False;
 
 		if (UNMARSHALLING(ps)) {
-			usr->other_sids = PRS_ALLOC_MEM(ps, DOM_SID2, usr->num_other_sids);
-			usr->other_sids_attrib =
-				PRS_ALLOC_MEM(ps, uint32, usr->num_other_sids);
-							       
+			if (usr->num_other_sids) {
+				usr->other_sids = PRS_ALLOC_MEM(ps, DOM_SID2, usr->num_other_sids);
+				usr->other_sids_attrib =
+					PRS_ALLOC_MEM(ps, uint32, usr->num_other_sids);
+			} else {
+				usr->other_sids = NULL;
+				usr->other_sids_attrib = NULL;
+			}
+
 			if ((num_other_sids != 0) &&
 			    ((usr->other_sids == NULL) ||
 			     (usr->other_sids_attrib == NULL)))
diff --git a/source3/rpc_parse/parse_prs.c b/source3/rpc_parse/parse_prs.c
index 84f64a2a66..458eee200a 100644
--- a/source3/rpc_parse/parse_prs.c
+++ b/source3/rpc_parse/parse_prs.c
@@ -644,8 +644,12 @@ BOOL prs_pointer( const char *name, prs_struct *ps, int depth,
 		return True;
 
 	if (UNMARSHALLING(ps)) {
-		if ( !(*data = PRS_ALLOC_MEM(ps, char, data_size)) )
-			return False;
+		if (data_size) {
+			if ( !(*data = PRS_ALLOC_MEM(ps, char, data_size)) )
+				return False;
+		} else {
+			*data = NULL;
+		}
 	}
 
 	return prs_fn(name, ps, depth, *data);
@@ -1016,16 +1020,16 @@ BOOL prs_buffer5(BOOL charmode, const char *name, prs_struct *ps, int depth, BUF
 	if (q == NULL)
 		return False;
 
+	/* If the string is empty, we don't have anything to stream */
+	if (str->buf_len==0)
+		return True;
+
 	if (UNMARSHALLING(ps)) {
 		str->buffer = PRS_ALLOC_MEM(ps,uint16,str->buf_len);
 		if (str->buffer == NULL)
 			return False;
 	}
 
-	/* If the string is empty, we don't have anything to stream */
-	if (str->buf_len==0)
-		return True;
-
 	p = (char *)str->buffer;
 
 	dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
@@ -1055,6 +1059,8 @@ BOOL prs_regval_buffer(BOOL charmode, const char *name, prs_struct *ps, int dept
 			buf->buffer = PRS_ALLOC_MEM(ps, uint16, buf->buf_max_len);
 			if ( buf->buffer == NULL )
 				return False;
+		} else {
+			buf->buffer = NULL;
 		}
 	}
 
@@ -1082,9 +1088,13 @@ BOOL prs_string2(BOOL charmode, const char *name, prs_struct *ps, int depth, STR
 		if (str->str_str_len > str->str_max_len) {
 			return False;
 		}
-		str->buffer = PRS_ALLOC_MEM(ps,unsigned char, str->str_max_len);
-		if (str->buffer == NULL)
-			return False;
+		if (str->str_max_len) {
+			str->buffer = PRS_ALLOC_MEM(ps,unsigned char, str->str_max_len);
+			if (str->buffer == NULL)
+				return False;
+		} else {
+			str->buffer = NULL;
+		}
 	}
 
 	if (UNMARSHALLING(ps)) {
@@ -1129,9 +1139,13 @@ BOOL prs_unistr2(BOOL charmode, const char *name, prs_struct *ps, int depth, UNI
 		if (str->uni_str_len > str->uni_max_len) {
 			return False;
 		}
-		str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len);
-		if (str->buffer == NULL)
-			return False;
+		if (str->uni_max_len) {
+			str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len);
+			if (str->buffer == NULL)
+				return False;
+		} else {
+			str->buffer = NULL;
+		}
 	}
 
 	p = (char *)str->buffer;
@@ -1156,9 +1170,13 @@ BOOL prs_unistr3(BOOL charmode, const char *name, UNISTR3 *str, prs_struct *ps,
 		return False;
 
 	if (UNMARSHALLING(ps)) {
-		str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len);
-		if (str->str.buffer == NULL)
-			return False;
+		if (str->uni_str_len) {
+			str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len);
+			if (str->str.buffer == NULL)
+				return False;
+		} else {
+			str->str.buffer = NULL;
+		}
 	}
 
 	p = (char *)str->str.buffer;
diff --git a/source3/rpc_parse/parse_samr.c b/source3/rpc_parse/parse_samr.c
index 223ce86977..e7726fbb26 100644
--- a/source3/rpc_parse/parse_samr.c
+++ b/source3/rpc_parse/parse_samr.c
@@ -3398,7 +3398,7 @@ BOOL samr_io_r_enum_domains(const char *desc, SAMR_R_ENUM_DOMAINS * r_u,
 		if(!prs_uint32("num_entries3", ps, depth, &r_u->num_entries3))
 			return False;
 
-		if (UNMARSHALLING(ps)) {
+		if (UNMARSHALLING(ps) && r_u->num_entries2) {
 			r_u->sam = PRS_ALLOC_MEM(ps,SAM_ENTRY,r_u->num_entries2);
 			r_u->uni_dom_name = PRS_ALLOC_MEM(ps,UNISTR2,r_u->num_entries2);
 		}
@@ -3537,7 +3537,7 @@ BOOL samr_io_r_enum_dom_groups(const char *desc, SAMR_R_ENUM_DOM_GROUPS * r_u,
 		if(!prs_uint32("num_entries3", ps, depth, &r_u->num_entries3))
 			return False;
 
-		if (UNMARSHALLING(ps)) {
+		if (UNMARSHALLING(ps) && r_u->num_entries2) {
 			r_u->sam = PRS_ALLOC_MEM(ps,SAM_ENTRY,r_u->num_entries2);
 			r_u->uni_grp_name = PRS_ALLOC_MEM(ps,UNISTR2,r_u->num_entries2);
 		}
@@ -5067,12 +5067,13 @@ BOOL samr_io_r_lookup_names(const char *desc, SAMR_R_LOOKUP_NAMES * r_u,
 			return False;
 		}
 
-		if (UNMARSHALLING(ps))
+		if (UNMARSHALLING(ps) && r_u->num_rids2) {
 			r_u->rids = PRS_ALLOC_MEM(ps, uint32, r_u->num_rids2);
 
-		if (!r_u->rids) {
-			DEBUG(0, ("NULL rids in samr_io_r_lookup_names\n"));
-			return False;
+			if (!r_u->rids) {
+				DEBUG(0, ("NULL rids in samr_io_r_lookup_names\n"));
+				return False;
+			}
 		}
 
 		for (i = 0; i < r_u->num_rids2; i++) {
@@ -5096,12 +5097,13 @@ BOOL samr_io_r_lookup_names(const char *desc, SAMR_R_LOOKUP_NAMES * r_u,
 			return False;
 		}
 
-		if (UNMARSHALLING(ps))
+		if (UNMARSHALLING(ps) && r_u->num_types2) {
 			r_u->types = PRS_ALLOC_MEM(ps, uint32, r_u->num_types2);
 
-		if (!r_u->types) {
-			DEBUG(0, ("NULL types in samr_io_r_lookup_names\n"));
-			return False;
+			if (!r_u->types) {
+				DEBUG(0, ("NULL types in samr_io_r_lookup_names\n"));
+				return False;
+			}
 		}
 
 		for (i = 0; i < r_u->num_types2; i++) {
diff --git a/source3/rpc_parse/parse_spoolss.c b/source3/rpc_parse/parse_spoolss.c
index 936587fdf5..4cd410d728 100644
--- a/source3/rpc_parse/parse_spoolss.c
+++ b/source3/rpc_parse/parse_spoolss.c
@@ -256,7 +256,7 @@ static BOOL smb_io_notify_option_type_ctr(const char *desc, SPOOL_NOTIFY_OPTION_
 		return False;
 
 	/* reading */
-	if (UNMARSHALLING(ps))
+	if (UNMARSHALLING(ps) && ctr->count)
 		if((ctr->type=PRS_ALLOC_MEM(ps,SPOOL_NOTIFY_OPTION_TYPE,ctr->count)) == NULL)
 			return False;
 		
@@ -415,7 +415,7 @@ BOOL smb_io_notify_info_data_strings(const char *desc,SPOOL_NOTIFY_INFO_DATA *da
 		if(!prs_uint32("string length", ps, depth, &data->notify_data.data.length))
 			return False;
 
-		if (UNMARSHALLING(ps)) {
+		if (UNMARSHALLING(ps) && data->notify_data.data.length) {
 			data->notify_data.data.string = PRS_ALLOC_MEM(ps, uint16,
 								data->notify_data.data.length);
 
@@ -434,7 +434,7 @@ BOOL smb_io_notify_info_data_strings(const char *desc,SPOOL_NOTIFY_INFO_DATA *da
 
 	case NOTIFY_POINTER:
 
-		if (UNMARSHALLING(ps)) {
+		if (UNMARSHALLING(ps) && data->notify_data.data.length) {
 			data->notify_data.data.string = PRS_ALLOC_MEM(ps, uint16,
 								data->notify_data.data.length);
 
@@ -494,9 +494,13 @@ BOOL smb_io_notify_info_data_strings(const char *desc,SPOOL_NOTIFY_INFO_DATA *da
 
 			/* Tallocate memory for string */
 
-			data->notify_data.data.string = PRS_ALLOC_MEM(ps, uint16, x * 2);
-			if (!data->notify_data.data.string) 
-				return False;
+			if (x) {
+				data->notify_data.data.string = PRS_ALLOC_MEM(ps, uint16, x * 2);
+				if (!data->notify_data.data.string) 
+					return False;
+			} else {
+				data->notify_data.data.string = NULL;
+			}
 
 			if(!prs_uint16uni(True,"string",ps,depth,data->notify_data.data.string,x))
 				return False;
@@ -6001,14 +6005,14 @@ BOOL spoolss_io_q_setprinterdata(const char *desc, SPOOL_Q_SETPRINTERDATA *q_u,
 		case REG_BINARY:
 		case REG_DWORD:
 		case REG_MULTI_SZ:
-            if (q_u->max_len) {
-                if (UNMARSHALLING(ps))
-    				q_u->data=PRS_ALLOC_MEM(ps, uint8, q_u->max_len);
-    			if(q_u->data == NULL)
-    				return False;
-    			if(!prs_uint8s(False,"data", ps, depth, q_u->data, q_u->max_len))
-    				return False;
-            }
+			if (q_u->max_len) {
+				if (UNMARSHALLING(ps))
+					q_u->data=PRS_ALLOC_MEM(ps, uint8, q_u->max_len);
+				if(q_u->data == NULL)
+					return False;
+				if(!prs_uint8s(False,"data", ps, depth, q_u->data, q_u->max_len))
+					return False;
+			}
 			if(!prs_align(ps))
 				return False;
 			break;
@@ -7031,7 +7035,7 @@ static BOOL spoolss_io_printer_enum_values_ctr(const char *desc, prs_struct *ps,
 	
 	/* first loop to write basic enum_value information */
 	
-	if (UNMARSHALLING(ps)) {
+	if (UNMARSHALLING(ps) && ctr->size_of_array) {
 		ctr->values = PRS_ALLOC_MEM(ps, PRINTER_ENUM_VALUES, ctr->size_of_array);
 		if (!ctr->values)
 			return False;