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vfio/pci: Cleanup vfio_early_setup_msix() error path

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With the addition of the Chelsio quirk we have an error path out of
vfio_early_setup_msix() that doesn't free the allocated VFIOMSIXInfo
struct.  This doesn't introduce a leak as it still gets freed in the
vfio_put_device() path, but it's complicated and sloppy to rely on
that.  Restructure to free the allocated data on error and only link
it into the vdev on success.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reported-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Alex Williamson 2015-09-23 13:04:43 -06:00
parent d451008e0f
commit b5bd049fa9
1 changed files with 13 additions and 14 deletions
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27
hw/vfio/pci.c
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@ -2203,6 +2203,7 @@ static int vfio_early_setup_msix(VFIOPCIDevice *vdev)
uint16_t ctrl;
uint32_t table, pba;
int fd = vdev->vbasedev.fd;
VFIOMSIXInfo *msix;
pos = pci_find_capability(&vdev->pdev, PCI_CAP_ID_MSIX);
if (!pos) {
@ -2228,21 +2229,19 @@ static int vfio_early_setup_msix(VFIOPCIDevice *vdev)
table = le32_to_cpu(table);
pba = le32_to_cpu(pba);
vdev->msix = g_malloc0(sizeof(*(vdev->msix)));
vdev->msix->table_bar = table & PCI_MSIX_FLAGS_BIRMASK;
vdev->msix->table_offset = table & ~PCI_MSIX_FLAGS_BIRMASK;
vdev->msix->pba_bar = pba & PCI_MSIX_FLAGS_BIRMASK;
vdev->msix->pba_offset = pba & ~PCI_MSIX_FLAGS_BIRMASK;
vdev->msix->entries = (ctrl & PCI_MSIX_FLAGS_QSIZE) + 1;
msix = g_malloc0(sizeof(*msix));
msix->table_bar = table & PCI_MSIX_FLAGS_BIRMASK;
msix->table_offset = table & ~PCI_MSIX_FLAGS_BIRMASK;
msix->pba_bar = pba & PCI_MSIX_FLAGS_BIRMASK;
msix->pba_offset = pba & ~PCI_MSIX_FLAGS_BIRMASK;
msix->entries = (ctrl & PCI_MSIX_FLAGS_QSIZE) + 1;
/*
* Test the size of the pba_offset variable and catch if it extends outside
* of the specified BAR. If it is the case, we need to apply a hardware
* specific quirk if the device is known or we have a broken configuration.
*/
if (vdev->msix->pba_offset >=
vdev->bars[vdev->msix->pba_bar].region.size) {
if (msix->pba_offset >= vdev->bars[msix->pba_bar].region.size) {
PCIDevice *pdev = &vdev->pdev;
uint16_t vendor = pci_get_word(pdev->config + PCI_VENDOR_ID);
uint16_t device = pci_get_word(pdev->config + PCI_DEVICE_ID);
@ -2254,18 +2253,18 @@ static int vfio_early_setup_msix(VFIOPCIDevice *vdev)
* is 0x1000, so we hard code that here.
*/
if (vendor == PCI_VENDOR_ID_CHELSIO && (device & 0xff00) == 0x5800) {
vdev->msix->pba_offset = 0x1000;
msix->pba_offset = 0x1000;
} else {
error_report("vfio: Hardware reports invalid configuration, "
"MSIX PBA outside of specified BAR");
g_free(msix);
return -EINVAL;
}
}
trace_vfio_early_setup_msix(vdev->vbasedev.name, pos,
vdev->msix->table_bar,
vdev->msix->table_offset,
vdev->msix->entries);
trace_vfio_early_setup_msix(vdev->vbasedev.name, pos, msix->table_bar,
msix->table_offset, msix->entries);
vdev->msix = msix;
return 0;
}