LinuxKPI: Fix resource leak on pci_iounmap-ing of PCI BAR

[wulf]

Summary

If the resource was allocated with want_iomap_res flag set.

Sponsored by: Serenity CyberSecurity, LLC
MFC after: 1 week

sys/compat/linuxkpi/common/src/linux_pci.c

 {
         return (linuxkpi_pci_iomap_range(pdev, mmio_bar, 0, mmio_size));
 }
 
 void
 linuxkpi_pci_iounmap(struct pci_dev *pdev, void *res)
 {
         struct pci_mmio_region *mmio, *p;
+        bus_space_handle_t bh = (bus_space_handle_t)res;
 
         TAILQ_FOREACH_SAFE(mmio, &pdev->mmio, next, p) {
-                if ((bus_space_handle_t)res < rman_get_bushandle(mmio->res) ||
-                    (bus_space_handle_t)res >= rman_get_bushandle(mmio->res) +
-                                               rman_get_size(mmio->res))
+                if (pdev->want_iomap_res) {
+                        if (res != mmio->res)
+                                continue;
+                } else {
+                        if (bh <  rman_get_bushandle(mmio->res) ||
+                            bh >= rman_get_bushandle(mmio->res) +
+                                  rman_get_size(mmio->res))
                                 continue;
+                }
                 bus_release_resource(pdev->dev.bsddev,
                     mmio->type, mmio->rid, mmio->res);
                 TAILQ_REMOVE(&pdev->mmio, mmio, next);
                 free(mmio, M_DEVBUF);
                 return;
         }
 }