Fix scan-build issues

src/gpg_data.c

@@ -409,11 +409,13 @@ int gpg_apdu_put_data(unsigned int ref) {
                         pkey_size = sizeof(cx_rsa_4096_private_key_t);
                         pq = G_gpg_vstate.work.rsa.public4096.n;
                         break;
+                    default:
+                        THROW(SW_WRONG_DATA);
+                        return 0;
                 }
                 ksz = ksz >> 1;
 
                 // fetch e
-                e = 0;
                 switch (len_e) {
                     case 4:
                         e = gpg_io_fetch_u32();
@@ -465,7 +467,6 @@ int gpg_apdu_put_data(unsigned int ref) {
                      (keygpg->attributes.value[0] == 22)) {
                 unsigned int curve;
 
-                ksz = 0;
                 curve = gpg_oid2curve(&keygpg->attributes.value[1], keygpg->attributes.length - 1);
                 if (curve == 0) {
                     THROW(SW_WRONG_DATA);

src/gpg_io.c

@@ -261,7 +261,7 @@ int gpg_io_do(unsigned int io_flags) {
                 xx = G_gpg_vstate.io_length - 2;
             }
             G_io_apdu_buffer[tx + 1] = xx;
-            rx = gpg_io_exchange(CHANNEL_APDU, tx + 2);
+            gpg_io_exchange(CHANNEL_APDU, tx + 2);
             // check get response
             if ((G_io_apdu_buffer[0] != 0x00) || (G_io_apdu_buffer[1] != 0xc0) ||
                 (G_io_apdu_buffer[2] != 0x00) || (G_io_apdu_buffer[3] != 0x00)) {
@@ -274,11 +274,10 @@ int gpg_io_do(unsigned int io_flags) {
                 G_gpg_vstate.io_length);
 
         if (io_flags & IO_RETURN_AFTER_TX) {
-            rx = gpg_io_exchange(CHANNEL_APDU | IO_RETURN_AFTER_TX, G_gpg_vstate.io_length);
+            gpg_io_exchange(CHANNEL_APDU | IO_RETURN_AFTER_TX, G_gpg_vstate.io_length);
             return 0;
-        } else {
-            rx = gpg_io_exchange(CHANNEL_APDU, G_gpg_vstate.io_length);
         }
+        rx = io_exchange(CHANNEL_APDU, G_gpg_vstate.io_length);
     }
 
     //--- full in chaining ---
@@ -288,7 +287,6 @@ int gpg_io_do(unsigned int io_flags) {
     }
     if (rx == 4) {
         G_io_apdu_buffer[4] = 0;
-        rx = 4;
     }
     G_gpg_vstate.io_offset = 0;
     G_gpg_vstate.io_length = 0;
@@ -343,7 +341,6 @@ int gpg_io_do(unsigned int io_flags) {
         }
         if (rx == 4) {
             G_io_apdu_buffer[4] = 0;
-            rx = 4;
         }
         G_gpg_vstate.io_cla = G_io_apdu_buffer[0];
         G_gpg_vstate.io_lc = G_io_apdu_buffer[4];

src/gpg_pso.c

@@ -85,6 +85,9 @@ static int gpg_sign(gpg_key_t *sigkey) {
             case 4096 / 8:
                 key = (cx_rsa_private_key_t *) &sigkey->priv_key.rsa4096;
                 break;
+            default:
+                THROW(SW_DATA_INVALID);
+                return 0;
         }
         if (key->size != ksz) {
             THROW(SW_CONDITIONS_NOT_SATISFIED);

src/gpg_ux_nanox.c

@@ -171,7 +171,6 @@ unsigned int ui_uifconfirm_action(unsigned int value) {
         gpg_io_insert_u16(sw);
         gpg_io_do(IO_RETURN_AFTER_TX);
         ui_menu_main_display(0);
-        sw = 0x6985;
     }
     return 0;
 }
@@ -228,7 +227,6 @@ void ui_menu_pinconfirm_display(unsigned int value) {
 unsigned int ui_pinconfirm_action(unsigned int value) {
     unsigned int sw;
 
-    sw = 0x6985;
     if (value == 1) {
         gpg_pin_set_verified(G_gpg_vstate.io_p2, 1);
         sw = 0x9000;