From: Ira Weiny <ira.weiny@intel.com>
Date: Thu, 9 Jun 2016 14:51:33 +0000 (-0700)
Subject: IB/hfi1: Prevent context loss
X-Git-Tag: v4.14-rc1~2898^2~5^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ca2f30a0a6786e6b08eeb8abb2bbb8df58709d6e;p=platform%2Fkernel%2Flinux-rpi.git

IB/hfi1: Prevent context loss

If a context has already been assigned to an FD, prevent
another assignment.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
---

diff --git a/drivers/infiniband/hw/hfi1/file_ops.c b/drivers/infiniband/hw/hfi1/file_ops.c
index 7a5b0e6..c702a00 100644
--- a/drivers/infiniband/hw/hfi1/file_ops.c
+++ b/drivers/infiniband/hw/hfi1/file_ops.c
@@ -203,6 +203,9 @@ static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
 
 	switch (cmd) {
 	case HFI1_IOCTL_ASSIGN_CTXT:
+		if (uctxt)
+			return -EINVAL;
+
 		if (copy_from_user(&uinfo,
 				   (struct hfi1_user_info __user *)arg,
 				   sizeof(uinfo)))