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Message-Id: <1375464944-27914-2-git-send-email-jon.mason@intel.com> Date: Fri, 2 Aug 2013 10:35:30 -0700 From: Jon Mason <jon.mason@...el.com> To: linux-kernel@...r.kernel.org Subject: [PATCH 01/15] NTB: Add Error Handling in ntb_device_setup If an error is encountered in ntb_device_setup, it is possible that the spci_cmd isn't populated. Writes to the offset can result in a NULL pointer dereference. This issue is easily encountered by running in NTB-RP mode, as it currently is not supported and will generate an error. To get around this issue, return if an error is encountered prior to attempting to write to the spci_cmd offset. Signed-off-by: Jon Mason <jon.mason@...el.com> --- drivers/ntb/ntb_hw.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c index 2dacd19..515099e 100644 --- a/drivers/ntb/ntb_hw.c +++ b/drivers/ntb/ntb_hw.c @@ -644,10 +644,13 @@ static int ntb_device_setup(struct ntb_device *ndev) rc = -ENODEV; } + if (rc) + return rc; + /* Enable Bus Master and Memory Space on the secondary side */ writew(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER, ndev->reg_ofs.spci_cmd); - return rc; + return 0; } static void ntb_device_free(struct ntb_device *ndev) -- 1.7.9.5 -- 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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