linux-kernel - Re: [PATCH] dmaengine: fix NULL pointer in channel unregistration function

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Message-Id: <170317621281.683420.8268114839792721931.b4-ty@kernel.org>
Date: Thu, 21 Dec 2023 22:00:12 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Dave Jiang <dave.jiang@...el.com>, 
 Amelie Delaunay <amelie.delaunay@...s.st.com>
Cc: linux-stm32@...md-mailman.stormreply.com, dmaengine@...r.kernel.org, 
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: fix NULL pointer in channel unregistration
 function


On Wed, 13 Dec 2023 17:04:52 +0100, Amelie Delaunay wrote:
> __dma_async_device_channel_register() can fail. In case of failure,
> chan->local is freed (with free_percpu()), and chan->local is nullified.
> When dma_async_device_unregister() is called (because of managed API or
> intentionally by DMA controller driver), channels are unconditionally
> unregistered, leading to this NULL pointer:
> [    1.318693] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d0
> [...]
> [    1.484499] Call trace:
> [    1.486930]  device_del+0x40/0x394
> [    1.490314]  device_unregister+0x20/0x7c
> [    1.494220]  __dma_async_device_channel_unregister+0x68/0xc0
> 
> [...]

Applied, thanks!

[1/1] dmaengine: fix NULL pointer in channel unregistration function
      commit: f5c24d94512f1b288262beda4d3dcb9629222fc7

Best regards,
-- 
~Vinod