[PATCH] crypto: cavium/nitrox - Fix 'nitrox_get_first_device()' when ndevlist is fully iterated

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
To: herbert@gondor.apana.org.au, davem@davemloft.net,
	jsrikanth@marvell.com, phemadri@marvell.com,
	gustavo@embeddedor.com, tglx@linutronix.de
Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
	kernel-janitors@vger.kernel.org,
	Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Subject: [PATCH] crypto: cavium/nitrox - Fix 'nitrox_get_first_device()' when ndevlist is fully iterated
Date: Tue, 19 May 2020 22:45:03 +0200	[thread overview]
Message-ID: <20200519204503.281872-1-christophe.jaillet@wanadoo.fr> (raw)

When a list is completely iterated with 'list_for_each_entry(x, ...)', x is
not NULL at the end.

Introduce an intermediate variable and test it instead, in order to
reliably know if something was found or not.

Fixes: f2663872f073 ("crypto: cavium - Register the CNN55XX supported crypto algorithms.")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
 drivers/crypto/cavium/nitrox/nitrox_main.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/cavium/nitrox/nitrox_main.c b/drivers/crypto/cavium/nitrox/nitrox_main.c
index 788c6607078b..172cafe7c039 100644
--- a/drivers/crypto/cavium/nitrox/nitrox_main.c
+++ b/drivers/crypto/cavium/nitrox/nitrox_main.c
@@ -278,15 +278,18 @@ static void nitrox_remove_from_devlist(struct nitrox_device *ndev)
 
 struct nitrox_device *nitrox_get_first_device(void)
 {
-	struct nitrox_device *ndev = NULL;
+	struct nitrox_device *ndev;
+	bool found = false;
 
 	mutex_lock(&devlist_lock);
 	list_for_each_entry(ndev, &ndevlist, list) {
-		if (nitrox_ready(ndev))
+		if (nitrox_ready(ndev)) {
+			found = true;
 			break;
+		}
 	}
 	mutex_unlock(&devlist_lock);
-	if (!ndev)
+	if (!found)
 		return NULL;
 
 	refcount_inc(&ndev->refcnt);
-- 
2.25.1

