don't access invalid array index (#405)

Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com>
Reviewed-by: John Levon <john.levon@nutanix.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/lib/irq.c b/lib/irq.c
index 7ea0349..3da1fb8 100644
--- a/lib/irq.c
+++ b/lib/irq.c
@@ -102,18 +102,18 @@ irqs_disable(vfu_ctx_t *vfu_ctx, uint32_t index, uint32_t start, uint32_t count)
     assert(index < VFU_DEV_NUM_IRQS);
     assert(start + count <= vfu_ctx->irq_count[index]);
 
-    vfu_log(vfu_ctx, LOG_DEBUG, "disabling IRQ type %s range [%u-%u)",
-            vfio_irq_idx_to_str(index), start, start + count);
-
     if (count == 0) {
         count = vfu_ctx->irq_count[index];
     }
 
+    vfu_log(vfu_ctx, LOG_DEBUG, "disabling IRQ type %s range [%u-%u)",
+            vfio_irq_idx_to_str(index), start, start + count);
+
     switch (index) {
     case VFIO_PCI_INTX_IRQ_INDEX:
     case VFIO_PCI_MSI_IRQ_INDEX:
     case VFIO_PCI_MSIX_IRQ_INDEX:
-        efds = vfu_ctx->irqs[index].efds;
+        efds = vfu_ctx->irqs->efds;
         break;
     case VFIO_PCI_ERR_IRQ_INDEX:
         efds = &vfu_ctx->irqs->err_efd;