Commit 21720562 authored by Jon Mason's avatar Jon Mason Committed by Greg Kroah-Hartman

NTB: Add Error Handling in ntb_device_setup

commit 3b12a0d15bd1559e72ad21d9d807fd2a6706f0ab upstream.

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: default avatarJon Mason <jon.mason@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent dad483b7
......@@ -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)
......
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