linux-kernel - Re: [PATCH 4.4 04/35] iwlwifi: pcie: add a NULL check in iwl_pcie_txq

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Date:   Thu, 25 Feb 2021 09:14:42 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.4 04/35] iwlwifi: pcie: add a NULL check in
 iwl_pcie_txq_unmap

On Thu, Feb 25, 2021 at 03:04:46PM +0900, Nobuhiro Iwamatsu wrote:
> Hi,
> 
> Sorry for the report after the release.
> 
> On Mon, Feb 22, 2021 at 01:36:00PM +0100, Greg Kroah-Hartman wrote:
> > From: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
> > 
> > [ Upstream commit 98c7d21f957b10d9c07a3a60a3a5a8f326a197e5 ]
> > 
> > I hit a NULL pointer exception in this function when the
> > init flow went really bad.
> > 
> > Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
> > Signed-off-by: Luca Coelho <luciano.coelho@...el.com>
> > Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
> > Link: https://lore.kernel.org/r/iwlwifi.20210115130252.2e8da9f2c132.I0234d4b8ddaf70aaa5028a20c863255e05bc1f84@changeid
> > Signed-off-by: Sasha Levin <sashal@...nel.org>
> > ---
> >  drivers/net/wireless/iwlwifi/pcie/tx.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/drivers/net/wireless/iwlwifi/pcie/tx.c b/drivers/net/wireless/iwlwifi/pcie/tx.c
> > index 8dfe6b2bc7031..cb03c2855019b 100644
> > --- a/drivers/net/wireless/iwlwifi/pcie/tx.c
> > +++ b/drivers/net/wireless/iwlwifi/pcie/tx.c
> > @@ -585,6 +585,11 @@ static void iwl_pcie_txq_unmap(struct iwl_trans *trans, int txq_id)
> >  	struct iwl_txq *txq = &trans_pcie->txq[txq_id];
> >  	struct iwl_queue *q = &txq->q;
> >  
> > +	if (!txq) {
> > +		IWL_ERR(trans, "Trying to free a queue that wasn't allocated?\n");
> > +		return;
> > +	}
> > +
> 
> I think that this fix is not enough.
> If txq is NULL, an error will occur with "struct iwl_queue * q = & txq->q;".
> The following changes are required.

Is this a 4.4-only thing, or is this issue also in Linus's tree as well?
If Linus's tree, please submit this as a normal patch so we can apply it
there first.

thanks,

greg k-h