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The 'rt2x00lib_probe_dev' function tries to allocate the workqueue. If the allocation fails, 'rt2x00_lib_remove_dev' is called on the error path. Because 'rt2x00dev->workqueue' is NULL in this case, the 'destroy_workqueue' call will cause a NULL pointer dereference. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Acked-by: Gertjan van Wingerde <gwingerde@gmail.com> Acked-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>