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bdk: joycon: add packet size checks

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Pass the real received data size and do the proper checks for minimum info.
This commit is contained in:
CTCaer 2024-05-19 17:42:10 +03:00
parent b744f82942
commit 93296c2c38
1 changed files with 25 additions and 10 deletions
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35
bdk/input/joycon.c
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@ -234,7 +234,7 @@ typedef struct _jc_hid_in_rpt_t
u8 stick_h_right; u8 stick_h_right;
u8 stick_m_right; u8 stick_m_right;
u8 stick_v_right; u8 stick_v_right;
u8 vib_decider; // right:8, left:8. (bit3 en, bit2-0 buffer avail). u8 vib_decider; // right:4, left:4 (bit3 en, bit2-0 buffer avail).
u8 submcd_ack; u8 submcd_ack;
u8 subcmd; u8 subcmd;
u8 subcmd_data[]; u8 subcmd_data[];
@ -606,7 +606,7 @@ static void _jc_charging_decider(u8 batt, u8 uart)
_jc_power_supply(uart, false); _jc_power_supply(uart, false);
} }
static void _jc_parse_wired_hid(joycon_ctxt_t *jc, const u8* packet, u32 size) static void _jc_parse_wired_hid(joycon_ctxt_t *jc, const u8 *packet, int size)
{ {
u32 btn_tmp; u32 btn_tmp;
jc_hid_in_rpt_t *hid_pkt = (jc_hid_in_rpt_t *)packet; jc_hid_in_rpt_t *hid_pkt = (jc_hid_in_rpt_t *)packet;
@ -614,7 +614,14 @@ static void _jc_parse_wired_hid(joycon_ctxt_t *jc, const u8* packet, u32 size)
switch (hid_pkt->cmd) switch (hid_pkt->cmd)
{ {
case JC_HORI_INPUT_RPT: case JC_HORI_INPUT_RPT:
if (!(jc->type & JC_ID_HORI))
return;
case JC_HID_INPUT_RPT: case JC_HID_INPUT_RPT:
// Discard incomplete hid packets.
if (size < 12)
break;
btn_tmp = hid_pkt->btn_right | hid_pkt->btn_shared << 8 | hid_pkt->btn_left << 16; btn_tmp = hid_pkt->btn_right | hid_pkt->btn_shared << 8 | hid_pkt->btn_left << 16;
if (jc->type & JC_ID_L) if (jc->type & JC_ID_L)
@ -674,8 +681,12 @@ static void _jc_parse_wired_hid(joycon_ctxt_t *jc, const u8* packet, u32 size)
} }
} }
static void _jc_parse_wired_init(joycon_ctxt_t *jc, const u8* data, u32 size) static void _jc_parse_wired_init(joycon_ctxt_t *jc, const u8 *data, int size)
{ {
// Discard empty packets.
if (size <= 0)
return;
switch (data[0]) switch (data[0])
{ {
case JC_WIRED_CMD_GET_INFO: case JC_WIRED_CMD_GET_INFO:
@ -698,13 +709,13 @@ static void _jc_parse_wired_init(joycon_ctxt_t *jc, const u8* data, u32 size)
} }
} }
static void _jc_uart_pkt_parse(joycon_ctxt_t *jc, const jc_wired_hdr_t *pkt, size_t size) static void _jc_uart_pkt_parse(joycon_ctxt_t *jc, const jc_wired_hdr_t *pkt, int size)
{ {
switch (pkt->cmd) switch (pkt->cmd)
{ {
case JC_HORI_INPUT_RPT_CMD: case JC_HORI_INPUT_RPT_CMD:
case JC_WIRED_HID: case JC_WIRED_HID:
_jc_parse_wired_hid(jc, pkt->payload, (pkt->data[0] << 8) | pkt->data[1]); _jc_parse_wired_hid(jc, pkt->payload, size - sizeof(jc_wired_hdr_t));
break; break;
case JC_WIRED_INIT_REPLY: case JC_WIRED_INIT_REPLY:
_jc_parse_wired_init(jc, pkt->data, size - sizeof(jc_uart_hdr_t) - 1); _jc_parse_wired_init(jc, pkt->data, size - sizeof(jc_uart_hdr_t) - 1);
@ -719,11 +730,15 @@ static void _jc_uart_pkt_parse(joycon_ctxt_t *jc, const jc_wired_hdr_t *pkt, siz
jc->last_received_time = get_tmr_ms(); jc->last_received_time = get_tmr_ms();
} }
static void _jc_sio_parse_payload(joycon_ctxt_t *jc, u8 cmd, const u8* payload, u32 size) static void _jc_sio_parse_payload(joycon_ctxt_t *jc, u8 cmd, const u8 *payload, int size)
{ {
switch (cmd) switch (cmd)
{ {
case JC_SIO_CMD_STATUS: case JC_SIO_CMD_STATUS:
// Discard incomplete packets.
if (size < 12)
break;
jc_sio_hid_in_rpt_t *hid_pkt = (jc_sio_hid_in_rpt_t *)payload; jc_sio_hid_in_rpt_t *hid_pkt = (jc_sio_hid_in_rpt_t *)payload;
jc_gamepad.buttons = hid_pkt->btn_right | hid_pkt->btn_shared << 8 | hid_pkt->btn_left << 16; jc_gamepad.buttons = hid_pkt->btn_right | hid_pkt->btn_shared << 8 | hid_pkt->btn_left << 16;
jc_gamepad.home = !gpio_read(GPIO_PORT_V, GPIO_PIN_3); jc_gamepad.home = !gpio_read(GPIO_PORT_V, GPIO_PIN_3);
@ -744,7 +759,7 @@ static void _jc_sio_parse_payload(joycon_ctxt_t *jc, u8 cmd, const u8* payload,
} }
} }
static void _jc_sio_uart_pkt_parse(joycon_ctxt_t *jc, const jc_sio_in_rpt_t *pkt, u32 size) static void _jc_sio_uart_pkt_parse(joycon_ctxt_t *jc, const jc_sio_in_rpt_t *pkt, int size)
{ {
if (pkt->crc_hdr != _jc_crc((u8 *)pkt, sizeof(jc_sio_in_rpt_t) - 1, 0)) if (pkt->crc_hdr != _jc_crc((u8 *)pkt, sizeof(jc_sio_in_rpt_t) - 1, 0))
return; return;
@ -761,7 +776,7 @@ static void _jc_sio_uart_pkt_parse(joycon_ctxt_t *jc, const jc_sio_in_rpt_t *pkt
break; break;
case JC_SIO_CMD_IAP_VER: case JC_SIO_CMD_IAP_VER:
case JC_SIO_CMD_STATUS: case JC_SIO_CMD_STATUS:
_jc_sio_parse_payload(jc, cmd, pkt->payload, pkt->payload_size); _jc_sio_parse_payload(jc, cmd, pkt->payload, size - sizeof(jc_sio_in_rpt_t));
break; break;
case JC_SIO_CMD_UNK02: case JC_SIO_CMD_UNK02:
case JC_SIO_CMD_UNK20: case JC_SIO_CMD_UNK20:
@ -788,7 +803,7 @@ static void _jc_rcv_pkt(joycon_ctxt_t *jc)
jc_wired_hdr_t *jc_pkt = (jc_wired_hdr_t *)jc->buf; jc_wired_hdr_t *jc_pkt = (jc_wired_hdr_t *)jc->buf;
if (!jc->sio_mode && !memcmp(jc_pkt->uart_hdr.magic, "\x19\x81\x03", 3)) if (!jc->sio_mode && !memcmp(jc_pkt->uart_hdr.magic, "\x19\x81\x03", 3))
{ {
_jc_uart_pkt_parse(jc, jc_pkt, jc_pkt->uart_hdr.total_size_lsb + sizeof(jc_uart_hdr_t)); _jc_uart_pkt_parse(jc, jc_pkt, len);
return; return;
} }
@ -797,7 +812,7 @@ static void _jc_rcv_pkt(joycon_ctxt_t *jc)
jc_sio_in_rpt_t *sio_pkt = (jc_sio_in_rpt_t *)(jc->buf); jc_sio_in_rpt_t *sio_pkt = (jc_sio_in_rpt_t *)(jc->buf);
if (jc->sio_mode && sio_pkt->cmd == JC_SIO_INPUT_RPT && (sio_pkt->ack & JC_SIO_CMD_ACK) == JC_SIO_CMD_ACK) if (jc->sio_mode && sio_pkt->cmd == JC_SIO_INPUT_RPT && (sio_pkt->ack & JC_SIO_CMD_ACK) == JC_SIO_CMD_ACK)
{ {
_jc_sio_uart_pkt_parse(jc, sio_pkt, sio_pkt->payload_size + sizeof(jc_sio_in_rpt_t)); _jc_sio_uart_pkt_parse(jc, sio_pkt, len);
return; return;
} }