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Date: Mon, 28 Sep 2009 14:31:20 +0800 From: Xiaotian Feng <dfeng@...hat.com> To: lenb@...nel.org, bjorn.helgaas@...com, achiang@...com, andrew.patterson@...com, jbarnes@...tuousgeek.org Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, Xiaotian Feng <dfeng@...hat.com> Subject: [PATCH] acpi: pci_root: fix NULL pointer deref after resume from suspend commit 275582 introduces acpi_get_pci_dev(), but pdev->subordinate can be NULL, then a NULL was passed to pci_get_slot, this results the kernel oops when resume from suspend. This patch resolves following kernel oops: BUG: unable to handle kernel NULL pointer dereference at 0000000000000028 IP: [<ffffffff812217e7>] pci_get_slot+0x4c/0x8c Signed-off-by: Xiaotian Feng <dfeng@...hat.com> --- drivers/acpi/pci_root.c | 6 +++++- 1 files changed, 5 insertions(+), 1 deletions(-) diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 3112221..3c35144 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -387,7 +387,11 @@ struct pci_dev *acpi_get_pci_dev(acpi_handle handle) if (!pdev || hnd == handle) break; - pbus = pdev->subordinate; + if (pdev->subordinate) + pbus = pdev->subordinate; + else + pbus = pdev->bus; + pci_dev_put(pdev); } out: -- 1.6.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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