Re: [PATCH] staging: media: ipu7: fix MMU resource leak in ipu7_psys_init()

[Dan Carpenter <error27@gmail.com>]

On Fri, Apr 17, 2026 at 03:58:07PM +0800, Huihui Huang wrote:
> There is a memory leak in drivers/staging/media/ipu7/ipu7.c.
> 
> In ipu7_psys_init(), psys_adev->mmu is allocated by ipu7_mmu_init().
> When ipu7_bus_add_device() fails, the function returns without
> cleaning up the MMU resources.
> 
> Add the missing ipu7_mmu_cleanup() call on the error path to free
> the MMU resources.
> 
> Signed-off-by: Huihui Huang <hhhuang@smu.edu.sg>
> ---
>  drivers/staging/media/ipu7/ipu7.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/staging/media/ipu7/ipu7.c b/drivers/staging/media/ipu7/ipu7.c
> index c771e763f8c5..4039e548dc8f 100644
> --- a/drivers/staging/media/ipu7/ipu7.c
> +++ b/drivers/staging/media/ipu7/ipu7.c
> @@ -2228,6 +2228,7 @@ ipu7_psys_init(struct pci_dev *pdev, struct device *parent,
>  
>  	ret = ipu7_bus_add_device(psys_adev);
>  	if (ret) {
> +		ipu7_mmu_cleanup(psys_adev->mmu);

Same thing.  We call ipu7_mmu_cleanup() in the caller, and it looks like
that will trigger a NULL dereference.

>  		kfree(pdata);

This kfree() is also wrong.  We're supposed to do:

	put_device(&psys_adev->auxdev.dev);

which calls ipu7_bus_release() and that frees "pdata" along with
psys_adev.  In this function the first two error paths are correct
but the next two are buggy.

KTODO: Fix error handling in ipu7_psys_init()

regards,
dan carpenter