Re: [PATCH v2] mm: huge_memory: Fix kobject cleanup in thpsize_create error

[Baolin Wang <baolin.wang@linux.alibaba.com>]

On 7/13/26 1:41 PM, Hongling Zeng wrote:
> When kobject_init_and_add() fails, the kobject API requires calling
> kobject_put() to properly clean up the memory, not direct kfree().
> 
> According to the kobject API documentation, kobject_init_and_add()
> calls kobject_init() internally. If the subsequent kobject_add()
> fails, the kobject has still been initialized and must be cleaned up
> via the reference count mechanism (kobject_put), not direct kfree().
> 
> Direct kfree() leaves the kobject's internal state (including the
> reference count and kset membership) uncleaned, which can cause:
>   - Memory leaks of kobject internal structures
>   - Potential use-after-free if there are pending references
>   - Inconsistent state with the rest of the error handling code
> 
> This fix matches the pattern used elsewhere in the kernel and in the
> same function (err_put label) which correctly uses kobject_put().
> 
> Fixes: 3485b88390b0 ("mm: thp: introduce multi-size THP sysfs interface")
> Signed-off-by: Hongling Zeng <zenghongling@kylinos.cn>
> Suggested-by: Baolin Wang <baolin.wang@linux.alibaba.com>
> 
> ---

LGTM.
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>

By the way, I don't think my Suggested-by tag is needed, as it was just 
a simple comment (But no need to respin).