PCI: rcar: Fix use-after-free in probe error path
authorGeert Uytterhoeven <geert+renesas@glider.be>
Thu, 7 Dec 2017 10:15:19 +0000 (11:15 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 25 Feb 2018 10:08:03 +0000 (11:08 +0100)
commit473900cd523a9d11a03a2eb5fec2e2ef029fb21b
treebdc00b43ec510ee1dcae906431328ce76377f16a
parent73974676f802f6634054539757dd66fee0754190
PCI: rcar: Fix use-after-free in probe error path

[ Upstream commit 0c31f1d7be1b5c4858b1d714dcefa25f41428cab ]

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>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/pci/host/pcie-rcar.c