linux-kernel - [PATCH v1] Moving init_completion before request

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Date:   Fri, 29 Jul 2022 12:02:11 +0200
From:   Kshitiz Varshney <kshitiz.varshney@....com>
To:     Horia Geanta <horia.geanta@....com>,
        Pankaj Gupta <pankaj.gupta@....com>,
        Varun Sethi <V.Sethi@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Iuliana Prodan <iuliana.prodan@....com>,
        Gaurav Jain <gaurav.jain@....com>,
        Rahul Kumar Yadav <rahulkumar.yadav@....com>,
        Vabhav Sharma <vabhav.sharma@....com>,
        Sahil Malhotra <sahil.malhotra@....com>,
        Matt Mackall <mpm@...enic.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Steffen Trumtrar <s.trumtrar@...gutronix.de>,
        PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>,
        Martin Kaiser <martin@...ser.cx>
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-imx@....com, linux-arm-kernel@...ts.infradead.org,
        Kshitiz Varshney <kshitiz.varshney@....com>
Subject: [PATCH v1] Moving init_completion before request_irq

Issue:
While servicing interrupt, trying to access variable rng_op_done,
which is not yet initalized hence causing kernel to crash
while booting.

Fix:
Moving initialization of rng_op_done before request_irq.

Fixes: 1d5449445bd0 (hwrng: mx-rngc - add a driver for Freescale RNGC)
Signed-off-by: Kshitiz Varshney <kshitiz.varshney@....com>
---
 drivers/char/hw_random/imx-rngc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/char/hw_random/imx-rngc.c b/drivers/char/hw_random/imx-rngc.c
index b05d676ca814..53e571c4f283 100644
--- a/drivers/char/hw_random/imx-rngc.c
+++ b/drivers/char/hw_random/imx-rngc.c
@@ -270,6 +270,8 @@ static int imx_rngc_probe(struct platform_device *pdev)
 		goto err;
 	}
 
+	init_completion(&rngc->rng_op_done);
+
 	ret = devm_request_irq(&pdev->dev,
 			irq, imx_rngc_irq, 0, pdev->name, (void *)rngc);
 	if (ret) {
@@ -277,7 +279,6 @@ static int imx_rngc_probe(struct platform_device *pdev)
 		goto err;
 	}
 
-	init_completion(&rngc->rng_op_done);
 
 	rngc->rng.name = pdev->name;
 	rngc->rng.init = imx_rngc_init;
-- 
2.25.1