linux-kernel - [PATCH] net: ethernet: wiznet: avoid format string exposure

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Date:   Wed, 5 Apr 2017 14:39:35 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Akinobu Mita <akinobu.mita@...il.com>,
        Eric Dumazet <edumazet@...gle.com>, Tejun Heo <tj@...nel.org>,
        Florian Westphal <fw@...len.de>,
        Bhaktipriya Shridhar <bhaktipriya96@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        netdev@...r.kernel.org
Subject: [PATCH] net: ethernet: wiznet: avoid format string exposure

While unlikely, this makes sure any format strings in the device name
can't exposure information via the resulting workqueue name.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/net/ethernet/wiznet/w5100.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/wiznet/w5100.c b/drivers/net/ethernet/wiznet/w5100.c
index f90267f0519f..2bdfb39215e9 100644
--- a/drivers/net/ethernet/wiznet/w5100.c
+++ b/drivers/net/ethernet/wiznet/w5100.c
@@ -1152,7 +1152,8 @@ int w5100_probe(struct device *dev, const struct w5100_ops *ops,
 	if (err < 0)
 		goto err_register;
 
-	priv->xfer_wq = alloc_workqueue(netdev_name(ndev), WQ_MEM_RECLAIM, 0);
+	priv->xfer_wq = alloc_workqueue("%s", WQ_MEM_RECLAIM, 0,
+					netdev_name(ndev));
 	if (!priv->xfer_wq) {
 		err = -ENOMEM;
 		goto err_wq;
-- 
2.7.4


-- 
Kees Cook
Pixel Security