linux-kernel - Re: [PATCH 4.8 50/96] firmware: fix usermode helper fallback loading

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Date:   Fri, 24 Mar 2017 16:01:58 -0400
From:   Ben Gamari <ben@...rt-cactus.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yves-Alexis Perez <corsac@...sac.net>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Ming Lei <ming.lei@...onical.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH 4.8 50/96] firmware: fix usermode helper fallback loading

Greg Kroah-Hartman <gregkh@...uxfoundation.org> writes:

> On Fri, Jan 06, 2017 at 10:54:38PM +0100, Yves-Alexis Perez wrote:
>> On Fri, 2017-01-06 at 22:43 +0100, Greg Kroah-Hartman wrote:
>> > 4.8-stable review patch.  If anyone has any objections, please let me know.
>> 
>> Hi Greg,
>> 
>> Ben Gamari think there was a regression in that patch so I'm adding him to
>> recipients so he can voice concerns if needed.
>
> Given the lack of response, I'm going to assume all is fine :)
>
Oh dear, sorry for the late response; this was stuck in the pergatory of
my inbox.

It's been a while since I've looked at this, but I believe the alleged
regression in this pastch is the reason I have the attached patch in my
tree. I seem to recall that it was the ath10k driver which triggered the
issue.

Unfortunately I can't recall which driver was affected by this. I'll
have to see what happens when I revert the attached patch.

Cheers,

- Ben



Author: Ben Gamari <ben@...rt-cactus.org>
Date:   Mon Jan 2 00:38:05 2017 -0500

    firmware_class: Ensure buf is non-NULL in __fw_load_abort
    
    I have observed that this can be NULL.

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index ac350c518e0c..fd0be24911fc 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -546,7 +546,8 @@ static void __fw_load_abort(struct firmware_buf *buf)
         * There is a small window in which user can write to 'loading'
         * between loading done and disappearance of 'loading'
         */
-       if (fw_state_is_done(&buf->fw_st))
+
+       if (!buf || fw_state_is_done(&buf->fw_st))
                return;
 
        list_del_init(&buf->pending_list);


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