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IB/qib: Prevent context loss
author
Ira Weiny
<ira.weiny@intel.com>
Thu, 9 Jun 2016 14:51:39 +0000
(07:51 -0700)
committer
Doug Ledford
<dledford@redhat.com>
Sat, 18 Jun 2016 00:11:26 +0000
(20:11 -0400)
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>
drivers/infiniband/hw/qib/qib_file_ops.c
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diff --git
a/drivers/infiniband/hw/qib/qib_file_ops.c
b/drivers/infiniband/hw/qib/qib_file_ops.c
index
ff946d5
..
382466a
100644
(file)
--- a/
drivers/infiniband/hw/qib/qib_file_ops.c
+++ b/
drivers/infiniband/hw/qib/qib_file_ops.c
@@
-2178,6
+2178,11
@@
static ssize_t qib_write(struct file *fp, const char __user *data,
switch (cmd.type) {
case QIB_CMD_ASSIGN_CTXT:
+ if (rcd) {
+ ret = -EINVAL;
+ goto bail;
+ }
+
ret = qib_assign_ctxt(fp, &cmd.cmd.user_info);
if (ret)
goto bail;