diff options
| author | Jon Mason <jon.mason@intel.com> | 2013-07-15 13:23:47 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-11-13 12:05:34 +0900 |
| commit | 21720562911f038d7406654e7ea0c171cfac47b8 (patch) | |
| tree | 74b97d9062d54027ab47830d3f49d5ca30a9b4a6 | |
| parent | dad483b78d280665a110591fd418535e0f9791dc (diff) | |
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: Jon Mason <jon.mason@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/ntb/ntb_hw.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c index 2dacd19e1b8a..515099ee12fe 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) |