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authorJon Mason <jon.mason@intel.com>2013-07-15 13:23:47 -0700
committerJon Mason <jon.mason@intel.com>2013-09-03 11:13:12 -0700
commit3b12a0d15bd1559e72ad21d9d807fd2a6706f0ab (patch)
tree3209814c56be95926ee8fae65b2b95f752f059a8 /drivers/ntb
parent6e4664525b1db28f8c4e1130957f70a94c19213e (diff)
downloadlinux-3b12a0d15bd1559e72ad21d9d807fd2a6706f0ab.tar.bz2
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@intel.com>
Diffstat (limited to 'drivers/ntb')
-rw-r--r--drivers/ntb/ntb_hw.c5
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)