linux-kernel - Re: [PATCH v2] ppp: deflate: Fix possible crash in deflate

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Message-Id: <20190514.154236.2269798493150074980.davem@davemloft.net>
Date:   Tue, 14 May 2019 15:42:36 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     yuehaibing@...wei.com
Cc:     paulus@...ba.org, gnault@...hat.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v2] ppp: deflate: Fix possible crash in deflate_init

From: YueHaibing <yuehaibing@...wei.com>
Date: Tue, 14 May 2019 22:55:32 +0800

> BUG: unable to handle kernel paging request at ffffffffa018f000
 ...
> If ppp_deflate fails to register in deflate_init,
> module initialization failed out, however
> ppp_deflate_draft may has been regiestred and not
> unregistered before return.
> Then the seconed modprobe will trigger crash like this.
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
> v2: also check ppp_deflate_draft registration

Applied and queued up for -stable, thanks.