[PATCH] SCSI: mvsas: Fix NULL pointer dereference in mvs_slot_task_free

[PATCH] SCSI: mvsas: Fix NULL pointer dereference in mvs_slot_task_free

[Dāvis Mosāns]

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@gmail.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

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Re: [PATCH] SCSI: mvsas: Fix NULL pointer dereference in mvs_slot_task_free

[Dāvis Mosāns]

2015-08-21 7:29 GMT+03:00 Dāvis Mosāns <davispuh@gmail.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@gmail.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
>

ping? do I need to CC someone else?
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Re: [PATCH] SCSI: mvsas: Fix NULL pointer dereference in mvs_slot_task_free

[Tomas Henzl]

On 21.8.2015 06:29, Dāvis Mosāns wrote:
> 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@gmail.com>

Reviewed-by: Tomas Henzl <thenzl@redhat.com>

Cheers,
Tomas

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Re: [PATCH] SCSI: mvsas: Fix NULL pointer dereference in mvs_slot_task_free

[Dāvis Mosāns]

2015-08-21 7:29 GMT+03:00 Dāvis Mosāns <davispuh@gmail.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@gmail.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.

Re: [PATCH] SCSI: mvsas: Fix NULL pointer dereference in mvs_slot_task_free

[Johannes Thumshirn]

On Tue, 2015-10-20 at 20:41 +0300, Dāvis Mosāns wrote:
> 2015-08-21 7:29 GMT+03:00 Dāvis Mosāns <davispuh@gmail.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@gmail.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.

If it saved you from several crashes, it probably should be tagged for
stable, shouldn't it?

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>


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Re: [PATCH] SCSI: mvsas: Fix NULL pointer dereference in mvs_slot_task_free

[Dāvis Mosāns]

2015-10-21 10:33 GMT+03:00 Johannes Thumshirn <jthumshirn@suse.de>:
> On Tue, 2015-10-20 at 20:41 +0300, Dāvis Mosāns wrote:
>> 2015-08-21 7:29 GMT+03:00 Dāvis Mosāns <davispuh@gmail.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@gmail.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.
>
> If it saved you from several crashes, it probably should be tagged for
> stable, shouldn't it?
>
> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
>
>

I don't really know how that works... this is my first patch so I'm
not really concerned about in which version it gets in as long as it does.
I've been compiling kernel with this patch for these months so for me it
doesn't really make any difference.

Re: [PATCH] SCSI: mvsas: Fix NULL pointer dereference in mvs_slot_task_free

[Dāvis Mosāns]

2015-10-21 10:33 GMT+03:00 Johannes Thumshirn <jthumshirn@suse.de>:
> On Tue, 2015-10-20 at 20:41 +0300, Dāvis Mosāns wrote:
>> 2015-08-21 7:29 GMT+03:00 Dāvis Mosāns <davispuh@gmail.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@gmail.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.
>
> If it saved you from several crashes, it probably should be tagged for
> stable, shouldn't it?
>
> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
>
>

I don't really know how that works... this is my first patch so I'm
not really concerned about in which version it gets in as long as it does.
I've been compiling kernel with this patch for these months so for me it
doesn't really make any difference.
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Re: [PATCH] SCSI: mvsas: Fix NULL pointer dereference in mvs_slot_task_free

[Johannes Thumshirn]

On Wed, 2015-10-21 at 16:18 +0300, Dāvis Mosāns wrote:
> 2015-10-21 10:33 GMT+03:00 Johannes Thumshirn <jthumshirn@suse.de>:
> > On Tue, 2015-10-20 at 20:41 +0300, Dāvis Mosāns wrote:
> > > 2015-08-21 7:29 GMT+03:00 Dāvis Mosāns <davispuh@gmail.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@gmail.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.
> > 
> > If it saved you from several crashes, it probably should be tagged
> > for
> > stable, shouldn't it?
> > 
> > Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
> > 
> > 
> 
> I don't really know how that works... this is my first patch so I'm
> not really concerned about in which version it gets in as long as it
> does.
> I've been compiling kernel with this patch for these months so for me
> it
> doesn't really make any difference.

You can add
Cc: stable@vger.kernel.org
somewhere around your Signed-off-by 

Documentation/stable_kernel_rules.txt has all the process
documentation.

Re: [PATCH] SCSI: mvsas: Fix NULL pointer dereference in mvs_slot_task_free

[Johannes Thumshirn]

On Wed, 2015-10-21 at 16:18 +0300, Dāvis Mosāns wrote:
> 2015-10-21 10:33 GMT+03:00 Johannes Thumshirn <jthumshirn@suse.de>:
> > On Tue, 2015-10-20 at 20:41 +0300, Dāvis Mosāns wrote:
> > > 2015-08-21 7:29 GMT+03:00 Dāvis Mosāns <davispuh@gmail.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@gmail.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.
> > 
> > If it saved you from several crashes, it probably should be tagged
> > for
> > stable, shouldn't it?
> > 
> > Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
> > 
> > 
> 
> I don't really know how that works... this is my first patch so I'm
> not really concerned about in which version it gets in as long as it
> does.
> I've been compiling kernel with this patch for these months so for me
> it
> doesn't really make any difference.

You can add
Cc: stable@vger.kernel.org
somewhere around your Signed-off-by 

Documentation/stable_kernel_rules.txt has all the process
documentation.
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Re: [PATCH] SCSI: mvsas: Fix NULL pointer dereference in mvs_slot_task_free

[Dāvis Mosāns]

2015-10-21 16:47 GMT+03:00 Johannes Thumshirn <jthumshirn@suse.de>:
> On Wed, 2015-10-21 at 16:18 +0300, Dāvis Mosāns wrote:
>> 2015-10-21 10:33 GMT+03:00 Johannes Thumshirn <jthumshirn@suse.de>:
>> > On Tue, 2015-10-20 at 20:41 +0300, Dāvis Mosāns wrote:
>> > > 2015-08-21 7:29 GMT+03:00 Dāvis Mosāns <davispuh@gmail.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@gmail.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.
>> >
>> > If it saved you from several crashes, it probably should be tagged
>> > for
>> > stable, shouldn't it?
>> >
>> > Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
>> >
>> >
>>
>> I don't really know how that works... this is my first patch so I'm
>> not really concerned about in which version it gets in as long as it
>> does.
>> I've been compiling kernel with this patch for these months so for me
>> it
>> doesn't really make any difference.
>
> You can add
> Cc: stable@vger.kernel.org
> somewhere around your Signed-off-by
>
> Documentation/stable_kernel_rules.txt has all the process
> documentation.

Should I add it together with review tags too and resend patch or reply to this
thread with it edited or just leave it like it is now and whoever will see it
will add it himself?


also for stable requirements this line is a bit confusing
"It or an equivalent fix must already exist in Linus' tree (upstream)."

but then later seems it's not requirement for Option 1

Re: [PATCH] SCSI: mvsas: Fix NULL pointer dereference in mvs_slot_task_free

[Johannes Thumshirn]

On Wed, 2015-10-21 at 17:26 +0300, Dāvis Mosāns wrote:
> 2015-10-21 16:47 GMT+03:00 Johannes Thumshirn <jthumshirn@suse.de>:
> > On Wed, 2015-10-21 at 16:18 +0300, Dāvis Mosāns wrote:
> > > 2015-10-21 10:33 GMT+03:00 Johannes Thumshirn <jthumshirn@suse.de
> > > >:
> > > > On Tue, 2015-10-20 at 20:41 +0300, Dāvis Mosāns wrote:
> > > > > 2015-08-21 7:29 GMT+03:00 Dāvis Mosāns <davispuh@gmail.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=10189
> > > > > > 1
> > > > > > Signed-off-by: Dāvis Mosāns <davispuh@gmail.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.
> > > > 
> > > > If it saved you from several crashes, it probably should be
> > > > tagged
> > > > for
> > > > stable, shouldn't it?
> > > > 
> > > > Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
> > > > 
> > > > 
> > > 
> > > I don't really know how that works... this is my first patch so
> > > I'm
> > > not really concerned about in which version it gets in as long as
> > > it
> > > does.
> > > I've been compiling kernel with this patch for these months so
> > > for me
> > > it
> > > doesn't really make any difference.
> > 
> > You can add
> > Cc: stable@vger.kernel.org
> > somewhere around your Signed-off-by
> > 
> > Documentation/stable_kernel_rules.txt has all the process
> > documentation.
> 
> Should I add it together with review tags too and resend patch or
> reply to this
> thread with it edited or just leave it like it is now and whoever
> will see it
> will add it himself?

good question, but I think James can help here.

> 
> 
> also for stable requirements this line is a bit confusing
> "It or an equivalent fix must already exist in Linus' tree
> (upstream)."
> 
> but then later seems it's not requirement for Option 1

yes, if you tag it with the Cc, it will get to stable review _after_ it
is applied to Linus' tree