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Add range checks to PIIX read/write functions.

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This commit is contained in:
TomW 2015-10-31 18:35:56 +00:00
commit 685d6f2c33
1 changed files with 28 additions and 3 deletions
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31
src/piix.c
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@ -201,7 +201,13 @@ int piix_bus_master_sector_read(int channel, uint8_t *data)
if (piix_busmaster[channel].count < (512 - transferred))
{
// pclog("Transferring smaller - %i bytes\n", piix_busmaster[channel].count);
memcpy(&ram[piix_busmaster[channel].addr], data + transferred, piix_busmaster[channel].count);
if (piix_busmaster[channel].addr < (mem_size * 1024 * 1024))
{
int count = piix_busmaster[channel].count;
if ((piix_busmaster[channel].addr + count) > (mem_size * 1024 * 1024))
count = (mem_size * 1024 * 1024) - piix_busmaster[channel].addr;
memcpy(&ram[piix_busmaster[channel].addr], data + transferred, count);
}
transferred += piix_busmaster[channel].count;
piix_busmaster[channel].addr += piix_busmaster[channel].count;
piix_busmaster[channel].count = 0;
@ -209,6 +215,13 @@ int piix_bus_master_sector_read(int channel, uint8_t *data)
else
{
// pclog("Transferring larger - %i bytes\n", 512 - transferred);
if (piix_busmaster[channel].addr < (mem_size * 1024 * 1024))
{
int count = 512;
if ((piix_busmaster[channel].addr + count) > (mem_size * 1024 * 1024))
count = (mem_size * 1024 * 1024) - piix_busmaster[channel].addr;
memcpy(&ram[piix_busmaster[channel].addr], data + transferred, count);
}
memcpy(&ram[piix_busmaster[channel].addr], data + transferred, 512 - transferred);
piix_busmaster[channel].addr += (512 - transferred);
piix_busmaster[channel].count -= (512 - transferred);
@ -246,7 +259,13 @@ int piix_bus_master_sector_write(int channel, uint8_t *data)
if (piix_busmaster[channel].count < (512 - transferred))
{
// pclog("Transferring smaller - %i bytes\n", piix_busmaster[channel].count);
memcpy(data + transferred, &ram[piix_busmaster[channel].addr], piix_busmaster[channel].count);
if (piix_busmaster[channel].addr < (mem_size * 1024 * 1024))
{
int count = piix_busmaster[channel].count;
if ((piix_busmaster[channel].addr + count) > (mem_size * 1024 * 1024))
count = (mem_size * 1024 * 1024) - piix_busmaster[channel].addr;
memcpy(data + transferred, &ram[piix_busmaster[channel].addr], count);
}
transferred += piix_busmaster[channel].count;
piix_busmaster[channel].addr += piix_busmaster[channel].count;
piix_busmaster[channel].count = 0;
@ -254,7 +273,13 @@ int piix_bus_master_sector_write(int channel, uint8_t *data)
else
{
// pclog("Transferring larger - %i bytes\n", 512 - transferred);
memcpy(data + transferred, &ram[piix_busmaster[channel].addr], 512 - transferred);
if (piix_busmaster[channel].addr < (mem_size * 1024 * 1024))
{
int count = 512;
if ((piix_busmaster[channel].addr + count) > (mem_size * 1024 * 1024))
count = (mem_size * 1024 * 1024) - piix_busmaster[channel].addr;
memcpy(data + transferred, &ram[piix_busmaster[channel].addr], count);
}
piix_busmaster[channel].addr += (512 - transferred);
piix_busmaster[channel].count -= (512 - transferred);
transferred += (512 - transferred);