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Fri, 17 Apr 2026 01:59:05 -0700 (PDT) Date: Fri, 17 Apr 2026 11:59:02 +0300 From: Dan Carpenter To: Huihui Huang Cc: Sakari Ailus , Mauro Carvalho Chehab , Bingbu Cao , Greg Kroah-Hartman , linux-media@vger.kernel.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH] staging: media: ipu7: fix MMU resource leak in ipu7_psys_init() Message-ID: References: <20260417075807.2691958-1-hhhuang@smu.edu.sg> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260417075807.2691958-1-hhhuang@smu.edu.sg> 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 > --- > 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