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xen_pt_msi.c: Check for xen_host_pci_get_* failures in xen_pt_msix_init()

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Check the return status of the xen_host_pci_get_* functions we call in
xen_pt_msix_init(), and fail device init if the reads failed rather than
ploughing ahead. (Spotted by Coverity: CID 777338.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
This commit is contained in:
Peter Maydell 2017-07-09 17:37:22 +01:00 committed by Stefano Stabellini
parent a19bae42e3
commit 64c7c1175b
1 changed files with 10 additions and 2 deletions
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12
hw/xen/xen_pt_msi.c
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@ -535,7 +535,11 @@ int xen_pt_msix_init(XenPCIPassthroughState *s, uint32_t base)
return -1;
}
xen_host_pci_get_word(hd, base + PCI_MSIX_FLAGS, &control);
rc = xen_host_pci_get_word(hd, base + PCI_MSIX_FLAGS, &control);
if (rc) {
XEN_PT_ERR(d, "Failed to read PCI_MSIX_FLAGS field\n");
return rc;
}
total_entries = control & PCI_MSIX_FLAGS_QSIZE;
total_entries += 1;
@ -554,7 +558,11 @@ int xen_pt_msix_init(XenPCIPassthroughState *s, uint32_t base)
+ XC_PAGE_SIZE - 1)
& XC_PAGE_MASK);
xen_host_pci_get_long(hd, base + PCI_MSIX_TABLE, &table_off);
rc = xen_host_pci_get_long(hd, base + PCI_MSIX_TABLE, &table_off);
if (rc) {
XEN_PT_ERR(d, "Failed to read PCI_MSIX_TABLE field\n");
goto error_out;
}
bar_index = msix->bar_index = table_off & PCI_MSIX_FLAGS_BIRMASK;
table_off = table_off & ~PCI_MSIX_FLAGS_BIRMASK;
msix->table_base = s->real_device.io_regions[bar_index].base_addr;