linux-kernel - Re: [PATCH v2] irqchip/aspeed-i2c-ic: Fix irq domain name memory leak

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Date:   Tue, 3 Dec 2019 15:18:52 -0800
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     Roy van Doormaal <roy.van.doormaal@...drive-technologies.com>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Joel Stanley <joel@....id.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>,
        Andrew Jeffery <andrew@...id.au>, linux-i2c@...r.kernel.org,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>
Subject: Re: [PATCH v2] irqchip/aspeed-i2c-ic: Fix irq domain name memory leak

On Mon, Nov 25, 2019 at 11:41 PM Roy van Doormaal
<roy.van.doormaal@...drive-technologies.com> 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
> [<b5a3490c>] __kmalloc_track_caller+0x118/0x1a0
> [<f59c7ced>] kvasprintf+0x5c/0xc0
> [<49275eec>] kasprintf+0x30/0x50
> [<5713064b>] __irq_domain_add+0x184/0x25c
> [<53c594d0>] aspeed_i2c_ic_of_init+0x9c/0x128
> [<d8d7017e>] of_irq_init+0x1ec/0x314
> [<f8405bf1>] irqchip_init+0x1c/0x24
> [<7ef974b3>] init_IRQ+0x30/0x90
> [<87a1438f>] start_kernel+0x28c/0x458
> [< (null)>] (null)
> [<f0763fdf>] 0xffffffff
>
> Signed-off-by: Roy van Doormaal <roy.van.doormaal@...drive-technologies.com>

Acked-by: Brendan Higgins <brendanhiggins@...gle.com>

Sorry for the delayed response.