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19bdfc7b3c
mutex_unlock() may access the mutex structure after releasing the lock and therefore cannot be used to manage lifetime of objects directly (unlike spinlocks and refcounts). [1][2] Use a kref to release the driver data to avoid use-after-free in mutex_unlock() when release() races with disconnect(). [1]a51749ab34("locking/mutex: Document that mutex_unlock() is non-atomic") [2]2b9d9e0a9b("locking/mutex: Clarify that mutex_unlock(), and most other sleeping locks, can still use the lock object after it's unlocked") Fixes:ce0d7d3f57("usb: ldusb: ld_usb semaphore to mutex") Cc: stable <stable@kernel.org> Cc: Daniel Walker <dwalker@mvista.com> Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://patch.msgid.link/20260622152612.116422-4-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>