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

From: Jia-Ju Bai
Date: Sat May 04 2019 - 03:31:32 EST

On 2019/5/4 14:33, Greg KH wrote:
On Sat, May 04, 2019 at 11:37:48AM +0800, Jia-Ju Bai wrote:
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>
Very rare case, but nice fix. You should put "potential" in your
subject line as this is something that no one should ever hit :)

Okay, Greg, thanks for this advice :)

Best wishes,
Jia-Ju Bai