Re: [PATCH v2] staging: media: ipu7: fix boot_config leak on queue_mem failure

[Dan Carpenter <error27@gmail.com>]

On Fri, Apr 17, 2026 at 11:01:29AM +0300, Dan Carpenter wrote:
> On Fri, Apr 17, 2026 at 03:39:39PM +0800, Huihui Huang wrote:
> > There is a memory leak in drivers/staging/media/ipu7/ipu7-boot.c.
> > 
> > In ipu7_boot_init_boot_config(), boot_config is allocated by
> > ipu7_dma_alloc(). If the second ipu7_dma_alloc() for queue_mem fails,
> > the function returns -ENOMEM without freeing the previously allocated
> > boot_config.
> > 
> > Add the missing ipu7_dma_free() call before returning on the error
> > path.
> > 
> > Signed-off-by: Huihui Huang <hhhuang@smu.edu.sg>
> > ---
> > v2: Reword commit message in imperative mood. Remove unnecessary
> >     NULL assignment on the error path.
> > ---
> >  drivers/staging/media/ipu7/ipu7-boot.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/staging/media/ipu7/ipu7-boot.c b/drivers/staging/media/ipu7/ipu7-boot.c
> > index d7901ff78b38..495b3e05a9b1 100644
> > --- a/drivers/staging/media/ipu7/ipu7-boot.c
> > +++ b/drivers/staging/media/ipu7/ipu7-boot.c
> > @@ -263,6 +263,8 @@ int ipu7_boot_init_boot_config(struct ipu7_bus_device *adev,
> >  					   GFP_KERNEL, 0);
> >  	if (!syscom->queue_mem) {
> >  		dev_err(dev, "Failed to allocate queue memory.\n");
> > +		ipu7_dma_free(adev, adev->boot_config_size,
> > +			      adev->boot_config, adev->boot_config_dma_addr, 0);
> >  		return -ENOMEM;
> 
> Adding a free here leads to a double free.  It's the same issue.
> One magical cleanup function in the caller.
> 
> I haven't looked at this but I bet there are bugs in the error handling
> since magical cleanup functions are always buggy.

Btw, if you had kept the "adev->boot_config = NULL;" assignment that
you had in v1 then that would have prevented the double free since
ipu7_boot_release_boot_config() tests for that...  This information is
not useful to you at this point but I'm sure you will find it
frustrating.  :P

regards,
dan carpenter