diff options
| author | Igor V. Kovalenko <igor.v.kovalenko@gmail.com> | 2009-12-13 19:03:31 +0000 |
|---|---|---|
| committer | Blue Swirl <blauwirbel@gmail.com> | 2009-12-13 19:03:31 +0000 |
| commit | 90228ee395b71cdd64e6bc844e3d553eb9ef643f (patch) | |
| tree | c4b15718360671879c9e39bf9ebc92d728023c21 | |
| parent | cf708987d7df69a5c72db8ba587e448a1bd02587 (diff) | |
workaround for cmd646 bmdma register access while no dma is active
This is a workaround only, and is a partial revert
of a few changes to BMDMAState which removed pci_dev
field on the way.
- cmd646 pci_from_bm() expects bm->unit value to
correspond with bm data being passed to callback
as opaque pointer. This breaks when write to dma
control register of second channel happens when no
dma operation is in progress, so bm->unit is zero
for second channel, and pci_from_bm() returns garbage
pointer. Crash happens shortly after that while
dereferencing that pointer.
v0->v1: cleaned up dead code from pci_from_bm.
Signed-off-by: Igor V. Kovalenko <igor.v.kovalenko@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
| -rw-r--r-- | hw/ide/cmd646.c | 7 | ||||
| -rw-r--r-- | hw/ide/internal.h | 1 | ||||
| -rw-r--r-- | hw/ide/piix.c | 1 |
3 files changed, 4 insertions, 5 deletions
diff --git a/hw/ide/cmd646.c b/hw/ide/cmd646.c index e1e626e2a..835c98d72 100644 --- a/hw/ide/cmd646.c +++ b/hw/ide/cmd646.c @@ -70,11 +70,7 @@ static void ide_map(PCIDevice *pci_dev, int region_num, static PCIIDEState *pci_from_bm(BMDMAState *bm) { - if (bm->unit == 0) { - return container_of(bm, PCIIDEState, bmdma[0]); - } else { - return container_of(bm, PCIIDEState, bmdma[1]); - } + return bm->pci_dev; } static uint32_t bmdma_readb(void *opaque, uint32_t addr) @@ -145,6 +141,7 @@ static void bmdma_map(PCIDevice *pci_dev, int region_num, BMDMAState *bm = &d->bmdma[i]; d->bus[i].bmdma = bm; bm->bus = d->bus+i; + bm->pci_dev = d; qemu_add_vm_change_state_handler(ide_dma_restart_cb, bm); register_ioport_write(addr, 1, 1, bmdma_cmd_writeb, bm); diff --git a/hw/ide/internal.h b/hw/ide/internal.h index f937daacf..eb5b40418 100644 --- a/hw/ide/internal.h +++ b/hw/ide/internal.h @@ -474,6 +474,7 @@ struct BMDMAState { uint8_t status; uint32_t addr; + struct PCIIDEState *pci_dev; IDEBus *bus; /* current transfer state */ uint32_t cur_addr; diff --git a/hw/ide/piix.c b/hw/ide/piix.c index de3648023..2776ac365 100644 --- a/hw/ide/piix.c +++ b/hw/ide/piix.c @@ -78,6 +78,7 @@ static void bmdma_map(PCIDevice *pci_dev, int region_num, BMDMAState *bm = &d->bmdma[i]; d->bus[i].bmdma = bm; bm->bus = d->bus+i; + bm->pci_dev = d; qemu_add_vm_change_state_handler(ide_dma_restart_cb, bm); register_ioport_write(addr, 1, 1, bmdma_cmd_writeb, bm); |