This is a note to let you know that I've just added the patch titled
USB: Proper handling of Race Condition when two USB class drivers try to call init_usb_class simultaneously
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-proper-handling-of-race-condition-when-two-usb-class-drivers-try-to-call-init_usb_class-simultaneously.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2f86a96be0ccb1302b7eee7855dbee5ce4dc5dfb Mon Sep 17 00:00:00 2001
From: Ajay Kaher <ajay.kaher@xxxxxxxxxxx>
Date: Tue, 28 Mar 2017 08:09:32 -0400
Subject: USB: Proper handling of Race Condition when two USB class drivers try to call init_usb_class simultaneously
From: Ajay Kaher <ajay.kaher@xxxxxxxxxxx>
commit 2f86a96be0ccb1302b7eee7855dbee5ce4dc5dfb upstream.
There is race condition when two USB class drivers try to call
init_usb_class at the same time and leads to crash.
code path: probe->usb_register_dev->init_usb_class
To solve this, mutex locking has been added in init_usb_class() and
destroy_usb_class().
As pointed by Alan, removed "if (usb_class)" test from destroy_usb_class()
because usb_class can never be NULL there.
Signed-off-by: Ajay Kaher <ajay.kaher@xxxxxxxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/core/file.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/drivers/usb/core/file.c
+++ b/drivers/usb/core/file.c
@@ -26,6 +26,7 @@
#define MAX_USB_MINORS 256
static const struct file_operations *usb_minors[MAX_USB_MINORS];
static DECLARE_RWSEM(minor_rwsem);
+static DEFINE_MUTEX(init_usb_class_mutex);
static int usb_open(struct inode *inode, struct file *file)
{
@@ -108,8 +109,9 @@ static void release_usb_class(struct kre
static void destroy_usb_class(void)
{
- if (usb_class)
- kref_put(&usb_class->kref, release_usb_class);
+ mutex_lock(&init_usb_class_mutex);
+ kref_put(&usb_class->kref, release_usb_class);
+ mutex_unlock(&init_usb_class_mutex);
}
int usb_major_init(void)
@@ -171,7 +173,10 @@ int usb_register_dev(struct usb_interfac
if (intf->minor >= 0)
return -EADDRINUSE;
+ mutex_lock(&init_usb_class_mutex);
retval = init_usb_class();
+ mutex_unlock(&init_usb_class_mutex);
+
if (retval)
return retval;
Patches currently in stable-queue which might be from ajay.kaher@xxxxxxxxxxx are
queue-4.4/usb-proper-handling-of-race-condition-when-two-usb-class-drivers-try-to-call-init_usb_class-simultaneously.patch