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* patch "USB: usb-skeleton: fix NULL-deref on disconnect" added to usb-linus
@ 2019-10-10 10:41 gregkh
  0 siblings, 0 replies; only message in thread
From: gregkh @ 2019-10-10 10:41 UTC (permalink / raw)
  To: johan, gregkh, stable

This is a note to let you know that I've just added the patch titled

    USB: usb-skeleton: fix NULL-deref on disconnect

to my usb git tree which can be found at
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.

If you have any questions about this process, please let me know.

From bed5ef230943863b9abf5eae226a20fad9a8ff71 Mon Sep 17 00:00:00 2001
From: Johan Hovold <>
Date: Wed, 9 Oct 2019 19:09:42 +0200
Subject: USB: usb-skeleton: fix NULL-deref on disconnect

The driver was using its struct usb_interface pointer as an inverted
disconnected flag and was setting it to NULL before making sure all
completion handlers had run. This could lead to NULL-pointer
dereferences in the dev_err() statements in the completion handlers
which relies on said pointer.

Fix this by using a dedicated disconnected flag.

Note that this is also addresses a NULL-pointer dereference at release()
and a struct usb_interface reference leak introduced by a recent runtime
PM fix, which depends on and should have been submitted together with
this patch.

Fixes: 4212cd74ca6f ("USB: usb-skeleton.c: remove err() usage")
Fixes: 5c290a5e42c3 ("USB: usb-skeleton: fix runtime PM after driver unbind")
Cc: stable <>
Signed-off-by: Johan Hovold <>
Signed-off-by: Greg Kroah-Hartman <>
 drivers/usb/usb-skeleton.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c
index 8001d6384c73..c2843fcfa52d 100644
--- a/drivers/usb/usb-skeleton.c
+++ b/drivers/usb/usb-skeleton.c
@@ -61,6 +61,7 @@ struct usb_skel {
 	spinlock_t		err_lock;		/* lock for errors */
 	struct kref		kref;
 	struct mutex		io_mutex;		/* synchronize I/O with disconnect */
+	unsigned long		disconnected:1;
 	wait_queue_head_t	bulk_in_wait;		/* to wait for an ongoing read */
 #define to_skel_dev(d) container_of(d, struct usb_skel, kref)
@@ -238,7 +239,7 @@ static ssize_t skel_read(struct file *file, char *buffer, size_t count,
 	if (rv < 0)
 		return rv;
-	if (!dev->interface) {		/* disconnect() was called */
+	if (dev->disconnected) {		/* disconnect() was called */
 		rv = -ENODEV;
 		goto exit;
@@ -420,7 +421,7 @@ static ssize_t skel_write(struct file *file, const char *user_buffer,
 	/* this lock makes sure we don't submit URBs to gone devices */
-	if (!dev->interface) {		/* disconnect() was called */
+	if (dev->disconnected) {		/* disconnect() was called */
 		retval = -ENODEV;
 		goto error;
@@ -571,7 +572,7 @@ static void skel_disconnect(struct usb_interface *interface)
 	/* prevent more I/O from starting */
-	dev->interface = NULL;
+	dev->disconnected = 1;

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2019-10-10 10:41 patch "USB: usb-skeleton: fix NULL-deref on disconnect" added to usb-linus gregkh

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