If we throw away the very last item on the list, then we could end up
with a use after free of "dr".
Fixes: 15ca17645f19 ('PCI: hv: Add paravirtual PCI front-end for Microsoft Hyper-V VMs')
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c
index 9391dee..9b66ffe 100644
--- a/drivers/pci/host/pci-hyperv.c
+++ b/drivers/pci/host/pci-hyperv.c
@@ -1397,6 +1397,7 @@ static void pci_devices_present_work(struct work_struct *work)
/* Throw this away if the list still has stuff in it. */
if (!list_empty(&hbus->dr_list)) {
kfree(dr);
+ dr = NULL;
continue;
}
}
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