iso7816_fsm: Fix APDU case with P3=0
If P3=0 and we only receive a status word directly, we were
returning a very long mostly zero-initialized buffer instead
of the status word. Reason: We used msgb_put() instaed of
msgb_put_u8(), so the SW1 determined the size of the message.
Change-Id: I01e688db020b3b8a8735d615e653cc816caa7a13
Closes: OS#4744
diff --git a/ccid_common/iso7816_fsm.c b/ccid_common/iso7816_fsm.c
index 02e7c0d..a9d6ca1 100644
--- a/ccid_common/iso7816_fsm.c
+++ b/ccid_common/iso7816_fsm.c
@@ -1253,7 +1253,7 @@
osmo_fsm_inst_state_chg(fi, TPDU_S_PROCEDURE, 0, 0);
} else if ((byte >= 0x60 && byte <= 0x6f) || (byte >= 0x90 && byte <= 0x9f)) {
//msgb_apdu_sw(tfp->apdu) = byte << 8;
- msgb_put(tfp->tpdu, byte);
+ msgb_put_u8(tfp->tpdu, byte);
/* receive second SW byte (SW2) */
card_uart_set_rx_threshold(ip->uart, 1);
card_uart_ctrl(ip->uart, CUART_CTL_RX_TIMER_HINT, 1);