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displayid: prevent reading past EDID data.

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This commit is contained in:
Maxim Poliakovski 2023-10-03 00:42:03 +02:00
parent 5b366e592c
commit 576912dd55
2 changed files with 19 additions and 13 deletions
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11
devices/video/displayid.cpp
View File

@ -1,6 +1,6 @@
/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-21 divingkatae and maximum
Copyright (C) 2018-23 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
@ -75,6 +75,7 @@ DisplayID::DisplayID()
this->last_sda = 1;
this->last_scl = 1;
this->data_ptr = 0;
this->data_pos = 0;
}
DisplayID::DisplayID(uint8_t std_code, uint8_t ext_code)
@ -181,7 +182,8 @@ uint8_t DisplayID::update_ddc_i2c(uint8_t sda, uint8_t scl)
if (this->dev_addr & 1) {
this->next_state = I2CState::DATA;
this->data_ptr = this->edid;
this->byte = *(this->data_ptr++);
this->data_pos = 0;
this->byte = this->data_ptr[this->data_pos++];
} else {
this->next_state = I2CState::REG_ADDR;
}
@ -200,7 +202,10 @@ uint8_t DisplayID::update_ddc_i2c(uint8_t sda, uint8_t scl)
if (dev_addr & 1) {
if (!sda) {
/* load next data byte */
this->byte = *(this->data_ptr++);
if (data_pos < 128)
this->byte = this->data_ptr[this->data_pos++];
else
this->byte = 0;
} else {
LOG_F(ERROR, "DDC-I2C: Oops! NACK received");
}

13
devices/video/displayid.h
View File

@ -1,6 +1,6 @@
/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-21 divingkatae and maximum
Copyright (C) 2018-23 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
@ -76,11 +76,12 @@ private:
uint8_t prev_state;
uint8_t last_sda;
uint8_t last_scl;
int bit_count; /* number of bits processed so far */
uint8_t byte; /* byte value being currently transferred */
uint8_t dev_addr; /* current device address */
uint8_t reg_addr; /* current register address */
uint8_t* data_ptr; /* ptr to data byte to be transferred next */
uint8_t byte; // byte value being currently transferred
uint8_t dev_addr; // current device address
uint8_t reg_addr; // current register address
uint8_t* data_ptr; // ptr to data byte to be transferred next
int bit_count; // number of bits processed so far
int data_pos; // current position in the data buffer
/*
uint8_t edid[128] = {