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[ Upstream commit186e8f2bdb] The kthread_run() function returns error pointers so the max3421_hcd->spi_thread pointer can be either error pointers or NULL. Check for both before dereferencing it. Fixes:05dfa5c9bc("usb: host: max3421-hcd: fix "spi_rd8" uses dynamic stack allocation warning") Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Link: https://lore.kernel.org/r/aJTMVAPtRe5H6jug@stanley.mountain Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>