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drm/amd/display: fix rxstatus_msg_sz type narrowing
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[Why]
Code reading rxstatus message size was incorrectly assigning it to
uint8_t, despite the value being 10 bits long (lower byte plus lowest
2 bits from upper byte). This caused the highest 2 bits to be ignored,
potentially missing invalid values.

[How]
Change all local variables holding rxstatus message size from uint8_t
to uint16_t, as in mod_hdcp_message_hdcp2::rx_id_list_size.
Replaced untyped HDCP_2_2_HMID_RXSTATUS_MSG_SZ_HI macro with function
hdcp_2_2_hmid_rxstatus_msg_sz(const uint8_t[2]) to encapsulate entire
calculation and return a typed result.
Removed spaces mixed with tabs to fix indentation on modified lines.

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Dominik Kaszewski <dominik.kaszewski@amd.com>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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Dominik Kaszewski authored and Alex Deucher committed Nov 4, 2024
1 parent d7b86a0 commit 215b6dd
Showing 1 changed file with 12 additions and 19 deletions.
31 changes: 12 additions & 19 deletions drivers/gpu/drm/amd/display/modules/hdcp/hdcp2_execution.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,11 @@

#include "hdcp.h"

static inline uint16_t get_hdmi_rxstatus_msg_size(const uint8_t rxstatus[2])
{
return HDCP_2_2_HDMI_RXSTATUS_MSG_SZ_HI(rxstatus[1]) << 8 | rxstatus[0];
}

static inline enum mod_hdcp_status check_receiver_id_list_ready(struct mod_hdcp *hdcp)
{
uint8_t is_ready = 0;
Expand All @@ -35,8 +40,7 @@ static inline enum mod_hdcp_status check_receiver_id_list_ready(struct mod_hdcp
is_ready = HDCP_2_2_DP_RXSTATUS_READY(hdcp->auth.msg.hdcp2.rxstatus_dp) ? 1 : 0;
else
is_ready = (HDCP_2_2_HDMI_RXSTATUS_READY(hdcp->auth.msg.hdcp2.rxstatus[1]) &&
(HDCP_2_2_HDMI_RXSTATUS_MSG_SZ_HI(hdcp->auth.msg.hdcp2.rxstatus[1]) << 8 |
hdcp->auth.msg.hdcp2.rxstatus[0])) ? 1 : 0;
get_hdmi_rxstatus_msg_size(hdcp->auth.msg.hdcp2.rxstatus) != 0) ? 1 : 0;
return is_ready ? MOD_HDCP_STATUS_SUCCESS :
MOD_HDCP_STATUS_HDCP2_RX_ID_LIST_NOT_READY;
}
Expand Down Expand Up @@ -84,15 +88,13 @@ static inline enum mod_hdcp_status check_link_integrity_failure_dp(
static enum mod_hdcp_status check_ake_cert_available(struct mod_hdcp *hdcp)
{
enum mod_hdcp_status status;
uint16_t size;

if (is_dp_hdcp(hdcp)) {
status = MOD_HDCP_STATUS_SUCCESS;
} else {
status = mod_hdcp_read_rxstatus(hdcp);
if (status == MOD_HDCP_STATUS_SUCCESS) {
size = HDCP_2_2_HDMI_RXSTATUS_MSG_SZ_HI(hdcp->auth.msg.hdcp2.rxstatus[1]) << 8 |
hdcp->auth.msg.hdcp2.rxstatus[0];
const uint16_t size = get_hdmi_rxstatus_msg_size(hdcp->auth.msg.hdcp2.rxstatus);
status = (size == sizeof(hdcp->auth.msg.hdcp2.ake_cert)) ?
MOD_HDCP_STATUS_SUCCESS :
MOD_HDCP_STATUS_HDCP2_AKE_CERT_PENDING;
Expand All @@ -104,7 +106,6 @@ static enum mod_hdcp_status check_ake_cert_available(struct mod_hdcp *hdcp)
static enum mod_hdcp_status check_h_prime_available(struct mod_hdcp *hdcp)
{
enum mod_hdcp_status status;
uint8_t size;

status = mod_hdcp_read_rxstatus(hdcp);
if (status != MOD_HDCP_STATUS_SUCCESS)
Expand All @@ -115,8 +116,7 @@ static enum mod_hdcp_status check_h_prime_available(struct mod_hdcp *hdcp)
MOD_HDCP_STATUS_SUCCESS :
MOD_HDCP_STATUS_HDCP2_H_PRIME_PENDING;
} else {
size = HDCP_2_2_HDMI_RXSTATUS_MSG_SZ_HI(hdcp->auth.msg.hdcp2.rxstatus[1]) << 8 |
hdcp->auth.msg.hdcp2.rxstatus[0];
const uint16_t size = get_hdmi_rxstatus_msg_size(hdcp->auth.msg.hdcp2.rxstatus);
status = (size == sizeof(hdcp->auth.msg.hdcp2.ake_h_prime)) ?
MOD_HDCP_STATUS_SUCCESS :
MOD_HDCP_STATUS_HDCP2_H_PRIME_PENDING;
Expand All @@ -128,7 +128,6 @@ static enum mod_hdcp_status check_h_prime_available(struct mod_hdcp *hdcp)
static enum mod_hdcp_status check_pairing_info_available(struct mod_hdcp *hdcp)
{
enum mod_hdcp_status status;
uint8_t size;

status = mod_hdcp_read_rxstatus(hdcp);
if (status != MOD_HDCP_STATUS_SUCCESS)
Expand All @@ -139,8 +138,7 @@ static enum mod_hdcp_status check_pairing_info_available(struct mod_hdcp *hdcp)
MOD_HDCP_STATUS_SUCCESS :
MOD_HDCP_STATUS_HDCP2_PAIRING_INFO_PENDING;
} else {
size = HDCP_2_2_HDMI_RXSTATUS_MSG_SZ_HI(hdcp->auth.msg.hdcp2.rxstatus[1]) << 8 |
hdcp->auth.msg.hdcp2.rxstatus[0];
const uint16_t size = get_hdmi_rxstatus_msg_size(hdcp->auth.msg.hdcp2.rxstatus);
status = (size == sizeof(hdcp->auth.msg.hdcp2.ake_pairing_info)) ?
MOD_HDCP_STATUS_SUCCESS :
MOD_HDCP_STATUS_HDCP2_PAIRING_INFO_PENDING;
Expand All @@ -152,7 +150,6 @@ static enum mod_hdcp_status check_pairing_info_available(struct mod_hdcp *hdcp)
static enum mod_hdcp_status poll_l_prime_available(struct mod_hdcp *hdcp)
{
enum mod_hdcp_status status = MOD_HDCP_STATUS_FAILURE;
uint8_t size;
uint16_t max_wait = 20; // units of ms
uint16_t num_polls = 5;
uint16_t wait_time = max_wait / num_polls;
Expand All @@ -167,8 +164,7 @@ static enum mod_hdcp_status poll_l_prime_available(struct mod_hdcp *hdcp)
if (status != MOD_HDCP_STATUS_SUCCESS)
break;

size = HDCP_2_2_HDMI_RXSTATUS_MSG_SZ_HI(hdcp->auth.msg.hdcp2.rxstatus[1]) << 8 |
hdcp->auth.msg.hdcp2.rxstatus[0];
const uint16_t size = get_hdmi_rxstatus_msg_size(hdcp->auth.msg.hdcp2.rxstatus);
status = (size == sizeof(hdcp->auth.msg.hdcp2.lc_l_prime)) ?
MOD_HDCP_STATUS_SUCCESS :
MOD_HDCP_STATUS_HDCP2_L_PRIME_PENDING;
Expand All @@ -181,16 +177,14 @@ static enum mod_hdcp_status poll_l_prime_available(struct mod_hdcp *hdcp)
static enum mod_hdcp_status check_stream_ready_available(struct mod_hdcp *hdcp)
{
enum mod_hdcp_status status;
uint8_t size;

if (is_dp_hdcp(hdcp)) {
status = MOD_HDCP_STATUS_INVALID_OPERATION;
} else {
status = mod_hdcp_read_rxstatus(hdcp);
if (status != MOD_HDCP_STATUS_SUCCESS)
goto out;
size = HDCP_2_2_HDMI_RXSTATUS_MSG_SZ_HI(hdcp->auth.msg.hdcp2.rxstatus[1]) << 8 |
hdcp->auth.msg.hdcp2.rxstatus[0];
const uint16_t size = get_hdmi_rxstatus_msg_size(hdcp->auth.msg.hdcp2.rxstatus);
status = (size == sizeof(hdcp->auth.msg.hdcp2.repeater_auth_stream_ready)) ?
MOD_HDCP_STATUS_SUCCESS :
MOD_HDCP_STATUS_HDCP2_STREAM_READY_PENDING;
Expand Down Expand Up @@ -249,8 +243,7 @@ static uint8_t process_rxstatus(struct mod_hdcp *hdcp,
sizeof(hdcp->auth.msg.hdcp2.rx_id_list);
else
hdcp->auth.msg.hdcp2.rx_id_list_size =
HDCP_2_2_HDMI_RXSTATUS_MSG_SZ_HI(hdcp->auth.msg.hdcp2.rxstatus[1]) << 8 |
hdcp->auth.msg.hdcp2.rxstatus[0];
get_hdmi_rxstatus_msg_size(hdcp->auth.msg.hdcp2.rxstatus);
}
out:
return (*status == MOD_HDCP_STATUS_SUCCESS);
Expand Down

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