linux-kernel - Re: brcmfmac: Fix kernel oops on resume when request firmware fails.

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Message-Id: <20170613055448.C0CD36075B@smtp.codeaurora.org>
Date:   Tue, 13 Jun 2017 05:54:48 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     Arend van Spriel <arend.vanspriel@...adcom.com>,
        linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Christian Daudt <csd@...adcom.com>
Subject: Re: brcmfmac: Fix kernel oops on resume when request firmware fails.

Enric Balletbo i Serra <enric.balletbo@...labora.com> wrote:

> When request firmware fails, brcmf_ops_sdio_remove is being called and
> brcmf_bus freed. In such circumstancies if you do a suspend/resume cycle
> the kernel hangs on resume due a NULL pointer dereference in resume
> function.
> 
> Steps to reproduce the problem:
>  - modprobe brcmfmac without the firmware
>      brcmfmac mmc1:0001:1: Direct firmware load for brcm/brcmfmac4354-sdio.bin
>      failed with error -2
>  - do a suspend/resume cycle (echo mem > /sys/power/state)
> 
> Protect against the NULL pointer derefence by checking if dev_get_drvdata
> returned a valid pointer.
> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>

My understanding is that there's a new version of this patch which fixes
the issue. If not, let me know.

Patch set to Superseded.

-- 
https://patchwork.kernel.org/patch/9743159/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches