[Qemu-ppc] [PATCH] macio: fix overflow in lba to offset conversion for ATAPI devices

[Mark Cave-Ayland]

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