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Subject[PATCH 1/2] PCI: rcar: Fix use-after-free in probe error path
Date
If CONFIG_DEBUG_SLAB=y, and no PCIe card is inserted, the kernel crashes
during probe on r8a7791/koelsch:

rcar-pcie fe000000.pcie: PCIe link down
Unable to handle kernel paging request at virtual address 6b6b6b6b

(seeing this message requires earlycon and keep_bootcon).

Indeed, pci_free_host_bridge() frees the PCI host bridge, including the
embedded rcar_pcie object, so pci_free_resource_list() must not be
called afterwards.

To fix this, move the call to pci_free_resource_list() up, and update the
label name accordingly.

Fixes: ddd535f1ea3eb27e ("PCI: rcar: Fix memory leak when no PCIe card is inserted")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
drivers/pci/host/pcie-rcar.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
index 12796eccb2befd91..52ab3cb0a0bfe065 100644
--- a/drivers/pci/host/pcie-rcar.c
+++ b/drivers/pci/host/pcie-rcar.c
@@ -1128,12 +1128,12 @@ static int rcar_pcie_probe(struct platform_device *pdev)
err = rcar_pcie_get_resources(pcie);
if (err < 0) {
dev_err(dev, "failed to request resources: %d\n", err);
- goto err_free_bridge;
+ goto err_free_resource_list;
}

err = rcar_pcie_parse_map_dma_ranges(pcie, dev->of_node);
if (err)
- goto err_free_bridge;
+ goto err_free_resource_list;

pm_runtime_enable(dev);
err = pm_runtime_get_sync(dev);
@@ -1176,9 +1176,9 @@ static int rcar_pcie_probe(struct platform_device *pdev)
err_pm_disable:
pm_runtime_disable(dev);

-err_free_bridge:
- pci_free_host_bridge(bridge);
+err_free_resource_list:
pci_free_resource_list(&pcie->resources);
+ pci_free_host_bridge(bridge);

return err;
}
--
2.7.4
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