[PATCH 4.20 049/117] misc: ibmvsm: Fix potential NULL pointer dereference

[Greg Kroah-Hartman]

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>

commit e25df7812c91f62581301f9a7ac102acf92e4937 upstream.

There is a potential NULL pointer dereference in case kzalloc()
fails and returns NULL.

Fix this by adding a NULL check on *session*

Also, update the function header with information about the
expected return on failure and remove unnecessary variable rc.

This issue was detected with the help of Coccinelle.

Fixes: 0eca353e7ae7 ("misc: IBM Virtual Management Channel Driver (VMC)")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/misc/ibmvmc.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/misc/ibmvmc.c
+++ b/drivers/misc/ibmvmc.c
@@ -820,21 +820,24 @@ static int ibmvmc_send_msg(struct crq_se
  *
  * Return:
  *	0 - Success
+ *	Non-zero - Failure
  */
 static int ibmvmc_open(struct inode *inode, struct file *file)
 {
 	struct ibmvmc_file_session *session;
-	int rc = 0;
 
 	pr_debug("%s: inode = 0x%lx, file = 0x%lx, state = 0x%x\n", __func__,
 		 (unsigned long)inode, (unsigned long)file,
 		 ibmvmc.state);
 
 	session = kzalloc(sizeof(*session), GFP_KERNEL);
+	if (!session)
+		return -ENOMEM;
+
 	session->file = file;
 	file->private_data = session;
 
-	return rc;
+	return 0;
 }
 
 /**