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nscsi cd: Don't crash on certain commands when no cdrom is inserted

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This commit is contained in:
Olivier Galibert 2022-04-08 11:45:05 +02:00
parent 46df3e7640
commit badecba0e3
1 changed files with 13 additions and 3 deletions
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16
src/devices/bus/nscsi/cd.cpp
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@ -311,13 +311,13 @@ void nscsi_cdrom_device::scsi_command()
}
case SC_READ_CAPACITY: {
LOG("command READ CAPACITY\n");
if(!cdrom) {
return_no_cd();
break;
}
LOG("command READ CAPACITY\n");
// get the last used block on the disc
const u32 temp = cdrom->get_track_start(0xaa) * (bytes_per_sector / bytes_per_block) - 1;
@ -365,7 +365,7 @@ void nscsi_cdrom_device::scsi_command()
scsi_cmdbuf[pos++] = 0x80; // WP, cache
// get the last used block on the disc
const u32 temp = cdrom->get_track_start(0xaa) * (bytes_per_sector / bytes_per_block) - 1;
const u32 temp = cdrom ? cdrom->get_track_start(0xaa) * (bytes_per_sector / bytes_per_block) - 1 : 0;
scsi_cmdbuf[pos++] = 0x08; // Block descriptor length
scsi_cmdbuf[pos++] = 0x00; // density code
@ -463,6 +463,11 @@ void nscsi_cdrom_device::scsi_command()
case SC_READ_DISC_INFORMATION:
LOG("command READ DISC INFORMATION\n");
if(!cdrom) {
return_no_cd();
break;
}
std::fill_n(scsi_cmdbuf, 34, 0);
scsi_cmdbuf[1] = 32;
scsi_cmdbuf[2] = 2; // disc is complete
@ -538,6 +543,11 @@ void nscsi_cdrom_device::scsi_command()
LOG("command READ TOC PMA ATIP, format %s msf=%d size=%d\n", format_names[format], msf, size);
if(!cdrom) {
return_no_cd();
break;
}
int pos = 0;
switch (format) {
case 0: {