Commit 0d2f98e7 authored by Ajay Kaher's avatar Ajay Kaher Committed by Sasha Levin

USB: Proper handling of Race Condition when two USB class drivers try to call...

USB: Proper handling of Race Condition when two USB class drivers try to call init_usb_class simultaneously

[ Upstream commit 2f86a96b ]

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: default avatarAjay Kaher <ajay.kaher@samsung.com>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent 6842ff60
...@@ -26,6 +26,7 @@ ...@@ -26,6 +26,7 @@
#define MAX_USB_MINORS 256 #define MAX_USB_MINORS 256
static const struct file_operations *usb_minors[MAX_USB_MINORS]; static const struct file_operations *usb_minors[MAX_USB_MINORS];
static DECLARE_RWSEM(minor_rwsem); static DECLARE_RWSEM(minor_rwsem);
static DEFINE_MUTEX(init_usb_class_mutex);
static int usb_open(struct inode *inode, struct file *file) static int usb_open(struct inode *inode, struct file *file)
{ {
...@@ -108,8 +109,9 @@ static void release_usb_class(struct kref *kref) ...@@ -108,8 +109,9 @@ static void release_usb_class(struct kref *kref)
static void destroy_usb_class(void) static void destroy_usb_class(void)
{ {
if (usb_class) mutex_lock(&init_usb_class_mutex);
kref_put(&usb_class->kref, release_usb_class); kref_put(&usb_class->kref, release_usb_class);
mutex_unlock(&init_usb_class_mutex);
} }
int usb_major_init(void) int usb_major_init(void)
...@@ -171,7 +173,10 @@ int usb_register_dev(struct usb_interface *intf, ...@@ -171,7 +173,10 @@ int usb_register_dev(struct usb_interface *intf,
if (intf->minor >= 0) if (intf->minor >= 0)
return -EADDRINUSE; return -EADDRINUSE;
mutex_lock(&init_usb_class_mutex);
retval = init_usb_class(); retval = init_usb_class();
mutex_unlock(&init_usb_class_mutex);
if (retval) if (retval)
return retval; return retval;
......
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