mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-01 14:44:12 +00:00
Code Issues Releases Wiki Activity

ieee802154: ca8210: Fix a potential UAF in ca8210_probe

Browse source 
[ Upstream commit f990874b1c ]

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 removing the first clk_unregister(). Also, priv->clk could
be an error code on failure of clk_register_fixed_rate(). Use
IS_ERR_OR_NULL to catch this case in ca8210_unregister_ext_clock().

Fixes: ded845a781 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Message-ID: <20231007033049.22353-1-dinghao.liu@zju.edu.cn>
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dinghao Liu 2023-10-07 11:30:49 +08:00 committed by Greg Kroah-Hartman
parent 616761cf9d
commit 84c6aa0ae5
1 changed files with 3 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
drivers/net/ieee802154/ca8210.c
View file

@ -2783,7 +2783,6 @@ static int ca8210_register_ext_clock(struct spi_device *spi)
struct device_node *np = spi->dev.of_node;
struct ca8210_priv *priv = spi_get_drvdata(spi);
struct ca8210_platform_data *pdata = spi->dev.platform_data;
int ret = 0;
if (!np)
return -EFAULT;
@ -2800,18 +2799,8 @@ static int ca8210_register_ext_clock(struct spi_device *spi)
dev_crit(&spi->dev, "Failed to register external clk\n");
return PTR_ERR(priv->clk);
}
ret = of_clk_add_provider(np, of_clk_src_simple_get, priv->clk);
if (ret) {
clk_unregister(priv->clk);
dev_crit(
&spi->dev,
"Failed to register external clock as clock provider\n"
);
} else {
dev_info(&spi->dev, "External clock set as clock provider\n");
}
return ret;
return of_clk_add_provider(np, of_clk_src_simple_get, priv->clk);
}
/**
@ -2823,8 +2812,8 @@ static void ca8210_unregister_ext_clock(struct spi_device *spi)
{
struct ca8210_priv *priv = spi_get_drvdata(spi);
if (!priv->clk)
return
if (IS_ERR_OR_NULL(priv->clk))
return;
of_clk_del_provider(spi->dev.of_node);
clk_unregister(priv->clk);