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| author | Dinghao Liu <dinghao.liu@zju.edu.cn> | 2023-10-07 05:30:49 +0200 |
|---|---|---|
| committer | Stefan Schmidt <stefan@datenfreihafen.org> | 2023-10-07 20:37:38 +0200 |
| commit | f990874b1c98fe8e57ee9385669f501822979258 (patch) | |
| tree | 5435ed814172e3ffcf24161855bac2083ca85d47 /drivers/net | |
| parent | Merge branch 'ravb-fix-use-after-free-issues' (diff) | |
| download | linux-f990874b1c98fe8e57ee9385669f501822979258.tar.xz linux-f990874b1c98fe8e57ee9385669f501822979258.zip | |
ieee802154: ca8210: Fix a potential UAF in ca8210_probe
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: ded845a781a5 ("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>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ieee802154/ca8210.c | 17 |
1 files changed, 3 insertions, 14 deletions
diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c index aebb19f1b3a4..4ec0dab38872 100644 --- a/drivers/net/ieee802154/ca8210.c +++ b/drivers/net/ieee802154/ca8210.c @@ -2740,7 +2740,6 @@ 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; @@ -2757,18 +2756,8 @@ 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); } /** @@ -2780,8 +2769,8 @@ 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); |