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commit e168c25526cd0368af098095c2ded4a008007e1b upstream. When the mapping is already reaped the unmap must be a no-op, as we would otherwise try to remove the mapping twice, corrupting the involved data structures. Cc: stable@vger.kernel.org # 5.4 Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Tested-by: Guido Günther <agx@sigxcpu.org> Acked-by: Guido Günther <agx@sigxcpu.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>