[PATCH] usb: host: xhci_debugfs: Fix a null pointer dereference in xhci_debugfs_create_endpoint()

From: Jia-Ju Bai
Date: Fri May 03 2019 - 23:38:55 EST

In xhci_debugfs_create_slot(), kzalloc() can fail and
dev->debugfs_private will be NULL.
In xhci_debugfs_create_endpoint(), dev->debugfs_private is used without
any null-pointer check, and can cause a null pointer dereference.

To fix this bug, a null-pointer check is added in

This bug is found by a runtime fuzzing tool named FIZZER written by us.

Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxxxx>
drivers/usb/host/xhci-debugfs.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/usb/host/xhci-debugfs.c b/drivers/usb/host/xhci-debugfs.c
index cadc01336bf8..7ba6afc7ef23 100644
--- a/drivers/usb/host/xhci-debugfs.c
+++ b/drivers/usb/host/xhci-debugfs.c
@@ -440,6 +440,9 @@ void xhci_debugfs_create_endpoint(struct xhci_hcd *xhci,
struct xhci_ep_priv *epriv;
struct xhci_slot_priv *spriv = dev->debugfs_private;

+ if (!spriv)
+ return;
if (spriv->eps[ep_index])