diff options
| author | Xu Wang <vulab@iscas.ac.cn> | 2019-12-27 12:34:32 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-17 16:14:30 +0300 |
| commit | 12b0606000d0828630c033bf0c74c748464fe87d (patch) | |
| tree | 646dee9f8dfcf1bd451f96f1db517137a9d6d1ee /drivers/i2c | |
| parent | 56a1d1be57b956b5493ce6c18c993730dbbc11b8 (diff) | |
| download | linux-12b0606000d0828630c033bf0c74c748464fe87d.tar.xz | |
i2c: Fix a potential use after free
[ Upstream commit e4c72c06c367758a14f227c847f9d623f1994ecf ]
Free the adap structure only after we are done using it.
This patch just moves the put_device() down a bit to avoid the
use after free.
Fixes: 611e12ea0f12 ("i2c: core: manage i2c bus device refcount in i2c_[get|put]_adapter")
Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
[wsa: added comment to the code, added Fixes tag]
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-core-base.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index d43db2c3876e..19a317fdcf5b 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -2467,8 +2467,9 @@ void i2c_put_adapter(struct i2c_adapter *adap) if (!adap) return; - put_device(&adap->dev); module_put(adap->owner); + /* Should be last, otherwise we risk use-after-free with 'adap' */ + put_device(&adap->dev); } EXPORT_SYMBOL(i2c_put_adapter); |