From: Dinghao Liu <dinghao.liu@zju.edu.cn>
To: dinghao.liu@zju.edu.cn
Cc: Alexander Aring <alex.aring@gmail.com>,
Stefan Schmidt <stefan@datenfreihafen.org>,
Miquel Raynal <miquel.raynal@bootlin.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Marcel Holtmann <marcel@holtmann.org>,
Harry Morris <harrymorris12@gmail.com>,
linux-wpan@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] ieee802154: ca8210: Fix a potential UAF in ca8210_probe
Date: Mon, 25 Sep 2023 15:24:22 +0800 [thread overview]
Message-ID: <20230925072423.24772-1-dinghao.liu@zju.edu.cn> (raw)
If of_clk_add_provider() fails in ca8210_register_ext_clock(),
it calls clk_unregister() to release priv->clk and returns an
error. However, the caller ca8210_probe() then calls ca8210_remove(),
where priv->clk is freed again in ca8210_unregister_ext_clock(). In
this case, a use-after-free may happen in the second time we call
clk_unregister().
Fix this by nulling priv->clk after the first clk_unregister(). Also
refine the pointer checking in ca8210_unregister_ext_clock().
Fixes: ded845a781a5 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
---
drivers/net/ieee802154/ca8210.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c
index aebb19f1b3a4..1d545879c000 100644
--- a/drivers/net/ieee802154/ca8210.c
+++ b/drivers/net/ieee802154/ca8210.c
@@ -2760,6 +2760,7 @@ static int ca8210_register_ext_clock(struct spi_device *spi)
ret = of_clk_add_provider(np, of_clk_src_simple_get, priv->clk);
if (ret) {
clk_unregister(priv->clk);
+ priv->clk = NULL;
dev_crit(
&spi->dev,
"Failed to register external clock as clock provider\n"
@@ -2780,7 +2781,7 @@ static void ca8210_unregister_ext_clock(struct spi_device *spi)
{
struct ca8210_priv *priv = spi_get_drvdata(spi);
- if (!priv->clk)
+ if (IS_ERR_OR_NULL(priv->clk))
return
of_clk_del_provider(spi->dev.of_node);
--
2.17.1
next reply other threads:[~2023-09-25 7:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-25 7:24 Dinghao Liu [this message]
2023-09-25 8:29 ` [PATCH] ieee802154: ca8210: Fix a potential UAF in ca8210_probe Miquel Raynal
2023-09-25 8:48 ` dinghao.liu
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