From: Madhuparna Bhowmik Date: Tue, 11 Aug 2020 12:30:24 +0000 (+0530) Subject: crypto: picoxcell - Fix potential race condition bug X-Git-Tag: v5.15~2545^2~182 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=64f4a62e3b17f1e473f971127c2924cae42afc82;p=platform%2Fkernel%2Flinux-starfive.git crypto: picoxcell - Fix potential race condition bug engine->stat_irq_thresh was initialized after device_create_file() in the probe function, the initialization may race with call to spacc_stat_irq_thresh_store() which updates engine->stat_irq_thresh, therefore initialize it before creating the file in probe function. Found by Linux Driver Verification project (linuxtesting.org). Fixes: ce92136843cb ("crypto: picoxcell - add support for the...") Signed-off-by: Madhuparna Bhowmik Acked-by: Jamie Iles Signed-off-by: Herbert Xu --- diff --git a/drivers/crypto/picoxcell_crypto.c b/drivers/crypto/picoxcell_crypto.c index dac6eb3..fb34bf9 100644 --- a/drivers/crypto/picoxcell_crypto.c +++ b/drivers/crypto/picoxcell_crypto.c @@ -1685,11 +1685,6 @@ static int spacc_probe(struct platform_device *pdev) goto err_clk_put; } - ret = device_create_file(&pdev->dev, &dev_attr_stat_irq_thresh); - if (ret) - goto err_clk_disable; - - /* * Use an IRQ threshold of 50% as a default. This seems to be a * reasonable trade off of latency against throughput but can be @@ -1697,6 +1692,10 @@ static int spacc_probe(struct platform_device *pdev) */ engine->stat_irq_thresh = (engine->fifo_sz / 2); + ret = device_create_file(&pdev->dev, &dev_attr_stat_irq_thresh); + if (ret) + goto err_clk_disable; + /* * Configure the interrupts. We only use the STAT_CNT interrupt as we * only submit a new packet for processing when we complete another in