[PULL for-2.10 2/7] xen_pt_msi.c: Check for xen_host_pci_get_* failures in xen_pt_msix_init()

[Stefano Stabellini <sstabellini@kernel.org>]

From: Peter Maydell <peter.maydell@linaro.org>

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>
---
 hw/xen/xen_pt_msi.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/hw/xen/xen_pt_msi.c b/hw/xen/xen_pt_msi.c
index 62add06..ff9a79f 100644
--- a/hw/xen/xen_pt_msi.c
+++ b/hw/xen/xen_pt_msi.c
@@ -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;
-- 
1.9.1


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