linux-kernel - Re: [PATCH] SCSI: mvsas: Fix NULL pointer dereference in mvs_slot_task

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Message-ID: <CAOE4rSz=U+7WqiLz1fwyeBDkijkkfRPD=uY_twSVy9PWfDudww@mail.gmail.com>
Date:	Tue, 20 Oct 2015 20:41:54 +0300
From:	Dāvis Mosāns <davispuh@...il.com>
To:	"James E.J. Bottomley" <JBottomley@...n.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] SCSI: mvsas: Fix NULL pointer dereference in mvs_slot_task_free

2015-08-21 7:29 GMT+03:00 Dāvis Mosāns <davispuh@...il.com>:
> When pci_pool_alloc fails in mvs_task_prep then task->lldd_task stays
> NULL but it's later used in mvs_abort_task as slot which is passed
> to mvs_slot_task_free causing NULL pointer dereference.
>
> Just return from mvs_slot_task_free when passed with NULL slot.
>
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=101891
> Signed-off-by: Dāvis Mosāns <davispuh@...il.com>
> ---
>  drivers/scsi/mvsas/mv_sas.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
> index 454536c..9c78074 100644
> --- a/drivers/scsi/mvsas/mv_sas.c
> +++ b/drivers/scsi/mvsas/mv_sas.c
> @@ -887,6 +887,8 @@ static void mvs_slot_free(struct mvs_info *mvi, u32 rx_desc)
>  static void mvs_slot_task_free(struct mvs_info *mvi, struct sas_task *task,
>                           struct mvs_slot_info *slot, u32 slot_idx)
>  {
> +       if (!slot)
> +               return;
>         if (!slot->task)
>                 return;
>         if (!sas_protocol_ata(task->task_proto))
> --
> 2.5.0
>

Can this get merged?
So far since august it have saved me from several kernel crashes.
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