From: Dan Carpenter dan.carpenter@oracle.com
commit e6be18f6d62c1d3b331ae020b76a29c2ccf6b0bf upstream.
The call to put_i2c_dev() frees "i2c_dev" so there is a use after free when we call cdev_del(&i2c_dev->cdev).
Fixes: d6760b14d4a1 ('i2c: dev: switch from register_chrdev to cdev API') Signed-off-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Wolfram Sang wsa@the-dreams.de Signed-off-by: Ben Hutchings ben.hutchings@codethink.co.uk Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/i2c/i2c-dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c index 382c66d5a470..e5cd307ebfc9 100644 --- a/drivers/i2c/i2c-dev.c +++ b/drivers/i2c/i2c-dev.c @@ -599,9 +599,9 @@ static int i2cdev_detach_adapter(struct device *dev, void *dummy) if (!i2c_dev) /* attach_adapter must have failed */ return 0;
+ cdev_del(&i2c_dev->cdev); put_i2c_dev(i2c_dev); device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr)); - cdev_del(&i2c_dev->cdev);
pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name); return 0;