diff --git a/openair1/PHY/LTE_TRANSPORT/prach_common.c b/openair1/PHY/LTE_TRANSPORT/prach_common.c
index 0939398c60..6dfa1cdec6 100644
--- a/openair1/PHY/LTE_TRANSPORT/prach_common.c
+++ b/openair1/PHY/LTE_TRANSPORT/prach_common.c
@@ -304,8 +304,9 @@ const uint16_t prach_root_sequence_map4[138] = {
     57, 82,  58, 81,  59, 80,  60, 79,  61, 78,  62, 77,  63, 76,  64, 75,  65, 74,  66, 73,  67, 72,  68, 71,  69, 70};
 
 void dump_prach_config(LTE_DL_FRAME_PARMS *frame_parms,uint8_t subframe) {
-  FILE *fd;
-  fd = fopen("prach_config.txt","w");
+  FILE *fd = fopen("prach_config.txt", "w");
+  if (!fd)
+    return;
   fprintf(fd,"prach_config: subframe          = %d\n",subframe);
   fprintf(fd,"prach_config: N_RB_UL           = %d\n",frame_parms->N_RB_UL);
   fprintf(fd,"prach_config: frame_type        = %s\n",(frame_parms->frame_type==1) ? "TDD":"FDD");
diff --git a/openair1/PHY/TOOLS/smbv.c b/openair1/PHY/TOOLS/smbv.c
index a1088cc705..337fcbe13f 100644
--- a/openair1/PHY/TOOLS/smbv.c
+++ b/openair1/PHY/TOOLS/smbv.c
@@ -61,6 +61,8 @@ int smbv_init_config(const char* fname, uint16_t sequence_length)
   int k;
 
   f_ptr = fopen(fname,"w");
+  if (!f_ptr)
+    return -1;
 
   if (sequence_length>4) {
     msg("ERROR invalid sequence length: %d, maximum is 4\n", sequence_length);
@@ -101,6 +103,8 @@ int smbv_write_config_from_frame_parms(const char* fname, LTE_DL_FRAME_PARMS *fr
   FILE *f_ptr;
 
   f_ptr = fopen(fname,"a");
+  if (!f_ptr)
+    return -1;
 
   fprintf(f_ptr, "BB:EUTR:SLEN %d\n",slen);
 
@@ -188,6 +192,8 @@ int smbv_configure_datalist_for_alloc(const char* fname, uint8_t alloc, uint8_t
 {
   FILE *f_ptr;
   f_ptr = fopen(fname,"a");
+  if (!f_ptr)
+    return -1;
   char strbuf[(8<<1)+1];
   int i,k;
   strbuf[0] = '\0';
@@ -245,6 +251,8 @@ int smbv_configure_datalist_for_user(const char* fname, uint8_t user, uint8_t *b
 {
   FILE *f_ptr;
   f_ptr = fopen(fname,"a");
+  if (!f_ptr)
+    return -1;
   char strbuf[(8<<1)+1];
   int i,k;
 
@@ -284,6 +292,8 @@ int smbv_configure_user(const char* fname, uint8_t user, uint8_t transmission_mo
 {
   FILE *f_ptr;
   f_ptr = fopen(fname,"a");
+  if (!f_ptr)
+    return -1;
 
   fprintf(f_ptr, "BB:EUTR:DL:USER%d:TXM M1\n",user);
   fprintf(f_ptr, "BB:EUTR:DL:USER%d:UEC USER\n",user);
@@ -302,6 +312,8 @@ int smbv_configure_pdcch(const char* fname,uint8_t subframe,uint8_t num_pdcch_sy
   FILE *f_ptr;
 
   f_ptr = fopen(fname,"a");
+  if (!f_ptr)
+    return -1;
 
   fprintf(f_ptr, "BB:EUTR:DL:SUBF%d:ENCC:PCF:CREG %d\n",subframe,num_pdcch_symbols);
   fprintf(f_ptr, "BB:EUTR:DL:SUBF%d:ENCC:PDCC:FORM VAR\n",subframe);
@@ -325,6 +337,8 @@ int smbv_configure_common_dci(const char* fname, uint8_t subframe, const char* t
   void *dci_pdu = &dci_alloc->dci_pdu[0];
 
   f_ptr = fopen(fname,"a");
+  if (!f_ptr)
+    return -1;
 
   fprintf(f_ptr, "BB:EUTR:DL:SUBF%d:ENCC:STAT ON\n",subframe);
 
@@ -383,6 +397,8 @@ int smbv_configure_ue_spec_dci(const char* fname, uint8_t subframe, uint8_t user
   void *dci_pdu = &dci_alloc->dci_pdu[0];
 
   f_ptr = fopen(fname,"a");
+  if (!f_ptr)
+    return -1;
 
   fprintf(f_ptr, "BB:EUTR:DL:SUBF%d:ENCC:STAT ON\n",subframe);
   fprintf(f_ptr, "BB:EUTR:DL:SUBF%d:ENCC:PDCC:EXTC:ITEM%d:USER USER%d\n",subframe,item,user);