From: Sasha Levin <sasha.levin@oracle.com>
Date: Thu, 17 Sep 2015 20:04:19 +0000 (-0400)
Subject: IB/ucma: check workqueue allocation before usage
X-Git-Tag: firefly_0821_release~176^2~884^2~2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0174b381caf89443d92c6fe75f725f2bfeba96b6;p=firefly-linux-kernel-4.4.55.git

IB/ucma: check workqueue allocation before usage

Allocating a workqueue might fail, which wasn't checked so far and would
lead to NULL ptr derefs when an attempt to use it was made.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
---

diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index a53fc9b01c69..30467d10df91 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -1624,11 +1624,16 @@ static int ucma_open(struct inode *inode, struct file *filp)
 	if (!file)
 		return -ENOMEM;
 
+	file->close_wq = create_singlethread_workqueue("ucma_close_id");
+	if (!file->close_wq) {
+		kfree(file);
+		return -ENOMEM;
+	}
+
 	INIT_LIST_HEAD(&file->event_list);
 	INIT_LIST_HEAD(&file->ctx_list);
 	init_waitqueue_head(&file->poll_wait);
 	mutex_init(&file->mut);
-	file->close_wq = create_singlethread_workqueue("ucma_close_id");
 
 	filp->private_data = file;
 	file->filp = filp;