linux-kernel - Re: [PATCH v1] dmaengine: imx-sdma: fix kernel hangs with SLUB slab allocator

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Message-ID: <20191014080544.GM2654@vkoul-mobl>
Date:   Mon, 14 Oct 2019 13:35:44 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Robin Gong <yibin.gong@....com>
Cc:     "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "J.Lambrecht@...EVIC.com" <J.Lambrecht@...evic.com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] dmaengine: imx-sdma: fix kernel hangs with SLUB slab
 allocator

On 14-10-19, 13:32, Vinod Koul wrote:
> On 24-09-19, 09:49, Robin Gong wrote:
> > Illegal memory will be touch if SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3
> > (41) exceed the size of structure sdma_script_start_addrs(40),
> > thus cause memory corrupt such as slob block header so that kernel
> > trap into while() loop forever in slob_free(). Please refer to below
> > code piece in imx-sdma.c:
> > for (i = 0; i < sdma->script_number; i++)
> > 	if (addr_arr[i] > 0)
> > 		saddr_arr[i] = addr_arr[i]; /* memory corrupt here */
> > That issue was brought by commit a572460be9cf ("dmaengine: imx-sdma: Add
> > support for version 3 firmware") because SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3
> > (38->41 3 scripts added) not align with script number added in
> > sdma_script_start_addrs(2 scripts).
> 
> Applied, thanks

And after applying I noticed the patch title is not apt. The patch title
should reflect the change and not the cause or result.

So I have modified the title to: "dmaengine: imx-sdma: fix size check
for sdma script_number"

Thanks
-- 
~Vinod