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

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commit 2f86a96be0 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@samsung.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Ajay Kaher 2017-03-28 08:09:32 -04:00 • committed by Greg Kroah-Hartman

parent c31ff3ceb3

commit 5ffe717f35

1 changed files with 7 additions and 2 deletions

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drivers/usb/core/file.c

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