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Unverified Commit 6c53b45c authored by Michael Walle's avatar Michael Walle Committed by Mark Brown
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spi: fix use-after-free of the add_lock mutex



Commit 6098475d ("spi: Fix deadlock when adding SPI controllers on
SPI buses") introduced a per-controller mutex. But mutex_unlock() of
said lock is called after the controller is already freed:

  spi_unregister_controller(ctlr)
  -> put_device(&ctlr->dev)
    -> spi_controller_release(dev)
  -> mutex_unlock(&ctrl->add_lock)

Move the put_device() after the mutex_unlock().

Fixes: 6098475d ("spi: Fix deadlock when adding SPI controllers on SPI buses")
Signed-off-by: default avatarMichael Walle <michael@walle.cc>
Reviewed-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: default avatarLukas Wunner <lukas@wunner.de>
Cc: stable@vger.kernel.org # v5.15
Link: https://lore.kernel.org/r/20211111083713.3335171-1-michael@walle.cc


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 6532582c
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