Re: [PATCH v1] dmaengine: imx-sdma: fix kernel hangs with SLUB slab allocator
From: Vinod Koul
Date: Mon Oct 14 2019 - 04:05:51 EST
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"