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Re: [Qemu-devel] [Qemu-ppc] [PATCH] macio: fix overflow in lba to offset
From: |
Programmingkid |
Subject: |
Re: [Qemu-devel] [Qemu-ppc] [PATCH] macio: fix overflow in lba to offset conversion for ATAPI devices |
Date: |
Mon, 4 Jan 2016 21:08:49 -0500 |
> As the IDEState lba field is an int32_t, make sure we cast to int64_t before
> shifting to calculate the offset. Otherwise we end up with an overflow when
> trying to access sectors beyond 2GB as can occur when using DVD images.
>
> Signed-off-by: Mark Cave-Ayland <address@hidden>
> ---
> hw/ide/macio.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/hw/ide/macio.c b/hw/ide/macio.c
> index 3ee962f..a78b6e0 100644
> --- a/hw/ide/macio.c
> +++ b/hw/ide/macio.c
> @@ -280,7 +280,7 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int
> ret)
> }
>
> /* Calculate current offset */
> - offset = (int64_t)(s->lba << 11) + s->io_buffer_index;
> + offset = ((int64_t)(s->lba) << 11) + s->io_buffer_index;
>
> pmac_dma_read(s->blk, offset, io->len, pmac_ide_atapi_transfer_cb, io);
> return;
> --
> 1.7.10.4
It worked, but the first time I tried it, Mac OS 10.4.0 had a kernel panic. The
AppleADBKeyboard.kext was the cause. The second time it booted to the
installer.
Reviewed-by: John Arbuckle <address@hidden>
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