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;
}
/**
