https://git.reactos.org/?p=reactos.git;a=commitdiff;h=2ed695fc83296f206097b4ab82e64ab37793ff7b
commit 2ed695fc83296f206097b4ab82e64ab37793ff7b Author: Eric Kohl <[email protected]> AuthorDate: Thu Sep 19 23:24:43 2019 +0200 Commit: Eric Kohl <[email protected]> CommitDate: Thu Sep 19 23:27:11 2019 +0200 [FREELDR] Hack: Boot ReactOS even when a cdrom-drive does not report a proper geometry We need to find a way to retrieve the LBA sector count of a drive, not only its CHS geometry. --- boot/freeldr/freeldr/arch/i386/hwdisk.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/boot/freeldr/freeldr/arch/i386/hwdisk.c b/boot/freeldr/freeldr/arch/i386/hwdisk.c index d67494d508d..1717bdbd2dd 100644 --- a/boot/freeldr/freeldr/arch/i386/hwdisk.c +++ b/boot/freeldr/freeldr/arch/i386/hwdisk.c @@ -225,7 +225,9 @@ DiskSeek(ULONG FileId, LARGE_INTEGER* Position, SEEKMODE SeekMode) /* Convert in number of sectors */ NewPosition.QuadPart /= Context->SectorSize; - if (NewPosition.QuadPart >= Context->SectorCount) + + /* HACK: CDROMs may have a SectorCount of 0 */ + if (Context->SectorCount != 0 && NewPosition.QuadPart >= Context->SectorCount) return EINVAL; Context->SectorNumber = NewPosition.QuadPart;
