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diff --git a/sys/amd64/vmm/io/ppt.c b/sys/amd64/vmm/io/ppt.c
--- a/sys/amd64/vmm/io/ppt.c
+++ b/sys/amd64/vmm/io/ppt.c
@@ -750,6 +750,9 @@
}
}
+ if (idx >= ppt->msix.num_msgs)
+ return (EINVAL);
+
if ((vector_control & PCIM_MSIX_VCTRL_MASK) == 0) {
/* Tear down the IRQ if it's already set up */
ppt_teardown_msix_intr(ppt, idx);

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