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Mon, 25 Nov 2019 18:37:12 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.1.7-578-g826f590-fmstable-20191119v1 Mime-Version: 1.0 Message-Id: In-Reply-To: <20191125202937.23133-1-roy.van.doormaal@prodrive-technologies.com> References: <20191125202937.23133-1-roy.van.doormaal@prodrive-technologies.com> Date: Tue, 26 Nov 2019 10:08:36 +1030 From: "Andrew Jeffery" To: "Roy van Doormaal" , "Brendan Higgins" , "Benjamin Herrenschmidt" , "Joel Stanley" , "Thomas Gleixner" , "Jason Cooper" , "Marc Zyngier" , linux-i2c@vger.kernel.org, openbmc@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org Subject: Re: [PATCH] irqchip/aspeed-i2c-ic: Fix irq domain name memory leak Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 26 Nov 2019, at 06:59, Roy van Doormaal wrote: > The aspeed irqchip driver overwrites the default irq domain name, > but doesn't free the existing domain name. > This patch frees the irq domain name before overwriting it. > > kmemleak trace: > > unreferenced object 0xb8004c40 (size 64): > comm "swapper", pid 0, jiffies 4294937303 (age 747.660s) > hex dump (first 32 bytes): > 3a 61 68 62 3a 61 70 62 3a 62 75 73 40 31 65 37 :ahb:apb:bus@1e7 > 38 61 30 30 30 3a 69 6e 74 65 72 72 75 70 74 2d 8a000:interrupt- > backtrace: > [<086b59b8>] kmemleak_alloc+0xa8/0xc0 > [] __kmalloc_track_caller+0x118/0x1a0 > [] kvasprintf+0x5c/0xc0 > [<49275eec>] kasprintf+0x30/0x50 > [<5713064b>] __irq_domain_add+0x184/0x25c > [<53c594d0>] aspeed_i2c_ic_of_init+0x9c/0x128 > [] of_irq_init+0x1ec/0x314 > [] irqchip_init+0x1c/0x24 > [<7ef974b3>] init_IRQ+0x30/0x90 > [<87a1438f>] start_kernel+0x28c/0x458 > [< (null)>] (null) > [] 0xffffffff > > Signed-off-by: Roy van Doormaal > --- > drivers/irqchip/irq-aspeed-i2c-ic.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/irqchip/irq-aspeed-i2c-ic.c > b/drivers/irqchip/irq-aspeed-i2c-ic.c > index 8d591c179f81..8081b8483a79 100644 > --- a/drivers/irqchip/irq-aspeed-i2c-ic.c > +++ b/drivers/irqchip/irq-aspeed-i2c-ic.c > @@ -92,6 +92,8 @@ static int __init aspeed_i2c_ic_of_init(struct > device_node *node, > goto err_iounmap; > } > > + if (i2c_ic->irq_domain->flags & IRQ_DOMAIN_NAME_ALLOCATED) > + kfree(i2c_ic->irq_domain->name); > i2c_ic->irq_domain->name = "aspeed-i2c-domain"; Given that the name is no-longer allocated I think you need to clear the IRQ_DOMAIN_NAME_ALLOCATED bit from flags to avoid attempting to free the const string in irq_domain_remove(): https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/irq/irqdomain.c?h=v5.4#n263 Or do a kstrdup(). Andrew