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Box" cc: LKML , platform-driver-x86@vger.kernel.org, rajvi.jingar@linux.intel.com Subject: Re: [PATCH V5 01/20] platform/x86/intel/vsec: Fix xa_alloc memory leak In-Reply-To: <20231123040355.82139-2-david.e.box@linux.intel.com> Message-ID: <52a6e750-71ed-b1d5-8693-2759be4cd6e5@linux.intel.com> References: <20231123040355.82139-1-david.e.box@linux.intel.com> <20231123040355.82139-2-david.e.box@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 22 Nov 2023, David E. Box wrote: > Fixes memory leak, caught be kmemleak, due to failure to erase auxiliary > device entries from an xarray on removal. > > Signed-off-by: David E. Box > --- > V5 - New patch > > drivers/platform/x86/intel/vsec.c | 24 ++++++++++++++++-------- > drivers/platform/x86/intel/vsec.h | 1 + > 2 files changed, 17 insertions(+), 8 deletions(-) > > diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c > index c1f9e4471b28..ae811bb65910 100644 > --- a/drivers/platform/x86/intel/vsec.c > +++ b/drivers/platform/x86/intel/vsec.c > @@ -120,6 +120,8 @@ static void intel_vsec_dev_release(struct device *dev) > { > struct intel_vsec_device *intel_vsec_dev = dev_to_ivdev(dev); > > + xa_erase(&auxdev_array, intel_vsec_dev->id); > + > mutex_lock(&vsec_ida_lock); > ida_free(intel_vsec_dev->ida, intel_vsec_dev->auxdev.id); > mutex_unlock(&vsec_ida_lock); > @@ -136,9 +138,21 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent, > int ret, id; > > mutex_lock(&vsec_ida_lock); > - ret = ida_alloc(intel_vsec_dev->ida, GFP_KERNEL); > + id = ida_alloc(intel_vsec_dev->ida, GFP_KERNEL); > mutex_unlock(&vsec_ida_lock); > + if (id < 0) { > + kfree(intel_vsec_dev->resource); > + kfree(intel_vsec_dev); > + return ret; > + } > + > + ret = xa_alloc(&auxdev_array, &intel_vsec_dev->id, intel_vsec_dev, > + PMT_XA_LIMIT, GFP_KERNEL); > if (ret < 0) { > + mutex_lock(&vsec_ida_lock); > + ida_free(intel_vsec_dev->ida, id); > + mutex_unlock(&vsec_ida_lock); > + > kfree(intel_vsec_dev->resource); > kfree(intel_vsec_dev); > return ret; > @@ -147,7 +161,7 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent, > if (!parent) > parent = &pdev->dev; > > - auxdev->id = ret; > + auxdev->id = id; > auxdev->name = name; > auxdev->dev.parent = parent; > auxdev->dev.release = intel_vsec_dev_release; > @@ -169,12 +183,6 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent, > if (ret < 0) > return ret; > > - /* Add auxdev to list */ > - ret = xa_alloc(&auxdev_array, &id, intel_vsec_dev, PMT_XA_LIMIT, > - GFP_KERNEL); > - if (ret) > - return ret; > - > return 0; BTW, there's also another unnecessary return construct around this which remains after this removal. The devm_add_Action_or_reset() value can be returned directly (maybe make another patch from that cleanup though since this is a Fixes patch). -- i.