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Wed, 29 Nov 2023 05:21:34 -0800 (PST) Date: Wed, 29 Nov 2023 16:21:31 +0300 From: Dan Carpenter To: James Tai Cc: Thomas Gleixner , Marc Zyngier , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, kernel test robot , Dan Carpenter Subject: Re: [PATCH v3 2/6] irqchip: Add interrupt controller support for Realtek DHC SoCs Message-ID: <8f87bfca-ab5f-4b32-a400-a90d09b64cf1@suswa.mountain> References: <20231129054339.3054202-1-james.tai@realtek.com> <20231129054339.3054202-3-james.tai@realtek.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Wed, 29 Nov 2023 05:21:49 -0800 (PST) On Wed, Nov 29, 2023 at 11:21:06AM +0300, Dan Carpenter wrote: > > +int realtek_intc_probe(struct platform_device *pdev, const struct realtek_intc_info *info) > > +{ > > + struct realtek_intc_data *data; > > + struct device *dev = &pdev->dev; > > + struct device_node *node = dev->of_node; > > + int ret, i; > > + > > + data = devm_kzalloc(dev, struct_size(data, subset_data, info->cfg_num), GFP_KERNEL); > > + if (!data) > > + return -ENOMEM; > > + > > + data->base = of_iomap(node, 0); > > + if (!data->base) { > > + ret = -ENOMEM; > > + goto out_cleanup; > > devm_ allocations are cleaned up automatically so there is no need to > call devm_kfree() before returning. > > regards, > dan carpenter > > > + } > > + > > + data->info = info; > > + > > + raw_spin_lock_init(&data->lock); > > + > > + data->domain = irq_domain_add_linear(node, 32, &realtek_intc_domain_ops, data); Btw, as I was testing the other static checker warning for <= 0, my static checker really wants this irq_domain_add_linear() to be cleaned up on the error path. Otherwise it probably leads to a use after free because we free data (automatically or manually) but it's still on a list somewhere. > > + if (!data->domain) { > > + ret = -ENOMEM; > > + goto out_cleanup; > > + } > > + > > + data->subset_data_num = info->cfg_num; > > + for (i = 0; i < info->cfg_num; i++) { > > + ret = realtek_intc_subset(node, data, i); > > + if (ret) { > > + WARN(ret, "failed to init subset %d: %d", i, ret); > > + ret = -ENOMEM; > > + goto out_cleanup; This error path. regards, dan carpenter > > + } > > + } > > + > > + platform_set_drvdata(pdev, data); > > + > > + return 0; > > + > > +out_cleanup: > > + > > + if (data->base) > > + iounmap(data->base); > > + > > + devm_kfree(dev, data); > > + > > + return ret; > > +}