On Tue, Dec 21, 2021 at 04:45:50PM +0100, Rafał Miłecki wrote:
From: Rafał Miłecki <rafal@xxxxxxxxxx>
1. Drop incorrect put_device() calls
If device_register() fails then underlaying device_add() takes care of
calling put_device() if needed. There is no need to do that in a driver.
Did you read the documentation for device_register() that says:
* NOTE: _Never_ directly free @dev after calling this function, even
* if it returned an error! Always use put_device() to give up the
* reference initialized in this function instead.
2. Use device_unregister()
Now that we don't call put_device() we can use above helper.
Fixes: 3360acdf8391 ("nvmem: core: fix leaks on registration errors")
Cc: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Rafał Miłecki <rafal@xxxxxxxxxx>
---
That put_device() was explicitly added by Johan but after checking
device_register() twice I still think it's incorrect. I hope I didn't
miss sth obvious and I didn't mess it up.
---
drivers/nvmem/core.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 785a56e33f69..f7f31af7226f 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -901,12 +901,12 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
rval = device_register(&nvmem->dev);
if (rval)
- goto err_put_device;
+ return ERR_PTR(rval);
Where do you call put_device() to free the allocated memory?
You just leaked the kzalloc() call to allocate the memory pointed to by
nvmem :(
I think the code is fine as-is.