[Linux-kernel-mentees] [PATCH] net: bluetooth: Fix null pointer dereference in hci_event_packet()

[Linux-kernel-mentees] [PATCH] net: bluetooth: Fix null pointer dereference in hci_event_packet()

[Anmol Karn]

Prevent hci_phy_link_complete_evt() from dereferencing 'hcon->amp_mgr'
as NULL. Fix it by adding pointer check for it.

Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f
Signed-off-by: Anmol Karn <anmol.karan123@gmail.com>
---
 net/bluetooth/hci_event.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 4b7fc430793c..871e16804433 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -4936,6 +4936,11 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
 		return;
 	}
 
+	if (IS_ERR_OR_NULL(hcon->amp_mgr)) {
+		hci_dev_unlock(hdev);
+		return;
+	}
+
 	if (ev->status) {
 		hci_conn_del(hcon);
 		hci_dev_unlock(hdev);
-- 
2.28.0
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Re: [Linux-kernel-mentees] [PATCH] net: bluetooth: Fix null pointer dereference in hci_event_packet()

[Eric Biggers]

On Thu, Sep 10, 2020 at 10:04:24AM +0530, Anmol Karn wrote:
> Prevent hci_phy_link_complete_evt() from dereferencing 'hcon->amp_mgr'
> as NULL. Fix it by adding pointer check for it.
> 
> Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com
> Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f
> Signed-off-by: Anmol Karn <anmol.karan123@gmail.com>
> ---
>  net/bluetooth/hci_event.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> index 4b7fc430793c..871e16804433 100644
> --- a/net/bluetooth/hci_event.c
> +++ b/net/bluetooth/hci_event.c
> @@ -4936,6 +4936,11 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
>  		return;
>  	}
>  
> +	if (IS_ERR_OR_NULL(hcon->amp_mgr)) {
> +		hci_dev_unlock(hdev);
> +		return;
> +	}
> +

In patches that fix a NULL pointer dereference, please include a brief
explanation of why the pointer can be NULL, including what it means
semantically; and why the proposed change is the best fix for the problem.

Also, why IS_ERR_OR_NULL()?

- Eric
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Re: [Linux-kernel-mentees] [PATCH] net: bluetooth: Fix null pointer dereference in hci_event_packet()

[Anmol Karn]

On Wed, Sep 09, 2020 at 10:06:59PM -0700, Eric Biggers wrote:
> On Thu, Sep 10, 2020 at 10:04:24AM +0530, Anmol Karn wrote:
> > Prevent hci_phy_link_complete_evt() from dereferencing 'hcon->amp_mgr'
> > as NULL. Fix it by adding pointer check for it.
> > 
> > Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com
> > Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f
> > Signed-off-by: Anmol Karn <anmol.karan123@gmail.com>
> > ---
> >  net/bluetooth/hci_event.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> > index 4b7fc430793c..871e16804433 100644
> > --- a/net/bluetooth/hci_event.c
> > +++ b/net/bluetooth/hci_event.c
> > @@ -4936,6 +4936,11 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
> >  		return;
> >  	}
> >  
> > +	if (IS_ERR_OR_NULL(hcon->amp_mgr)) {
> > +		hci_dev_unlock(hdev);
> > +		return;
> > +	}
> > +
> 

Hello Sir,

> In patches that fix a NULL pointer dereference, please include a brief
> explanation of why the pointer can be NULL, including what it means
> semantically; and why the proposed change is the best fix for the problem.
> 

I will surely add more explaination in v2.

> Also, why IS_ERR_OR_NULL()?
> 

I used IS_ERR_OR_NULL() to check if the 'hcon->amp_mgr' is a valid pointer or not, 
and unregister the 'hcon' and signal error, but will make changes in v2 with only
NULL check included, if you think it's incorrect to use IS_ERR check here along with
NULL.


Thanks,
Anmol Karn
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Re: [Linux-kernel-mentees] [PATCH] net: bluetooth: Fix null pointer dereference in hci_event_packet()

[Dan Carpenter]

On Thu, Sep 10, 2020 at 10:04:24AM +0530, Anmol Karn wrote:
> Prevent hci_phy_link_complete_evt() from dereferencing 'hcon->amp_mgr'
> as NULL. Fix it by adding pointer check for it.
> 
> Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com
> Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f
> Signed-off-by: Anmol Karn <anmol.karan123@gmail.com>
> ---
>  net/bluetooth/hci_event.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> index 4b7fc430793c..871e16804433 100644
> --- a/net/bluetooth/hci_event.c
> +++ b/net/bluetooth/hci_event.c
> @@ -4936,6 +4936,11 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
>  		return;
>  	}
>  
> +	if (IS_ERR_OR_NULL(hcon->amp_mgr)) {

It can't be an error pointer.  Shouldn't we call hci_conn_del() on this
path?  Try to find the Fixes tag to explain how this bug was introduced.

(Don't rush to send a v2.  The patch requires quite a bit more digging
and detective work before it is ready).

> +		hci_dev_unlock(hdev);
> +		return;
> +	}
> +
>  	if (ev->status) {
>  		hci_conn_del(hcon);
>  		hci_dev_unlock(hdev);

regards,
dan carpenter

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Re: [Linux-kernel-mentees] [PATCH] net: bluetooth: Fix null pointer dereference in hci_event_packet()

[Anmol Karn]

On Thu, Sep 10, 2020 at 01:49:18PM +0300, Dan Carpenter wrote:
> On Thu, Sep 10, 2020 at 10:04:24AM +0530, Anmol Karn wrote:
> > Prevent hci_phy_link_complete_evt() from dereferencing 'hcon->amp_mgr'
> > as NULL. Fix it by adding pointer check for it.
> > 
> > Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com
> > Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f
> > Signed-off-by: Anmol Karn <anmol.karan123@gmail.com>
> > ---
> >  net/bluetooth/hci_event.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> > index 4b7fc430793c..871e16804433 100644
> > --- a/net/bluetooth/hci_event.c
> > +++ b/net/bluetooth/hci_event.c
> > @@ -4936,6 +4936,11 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
> >  		return;
> >  	}
> >  
> > +	if (IS_ERR_OR_NULL(hcon->amp_mgr)) {
> 
> It can't be an error pointer.  Shouldn't we call hci_conn_del() on this
> path?  Try to find the Fixes tag to explain how this bug was introduced.
> 
> (Don't rush to send a v2.  The patch requires quite a bit more digging
> and detective work before it is ready).
> 
> > +		hci_dev_unlock(hdev);
> > +		return;
> > +	}
> > +
> >  	if (ev->status) {
> >  		hci_conn_del(hcon);
> >  		hci_dev_unlock(hdev);
> 
> regards,
> dan carpenter
> 

Sure sir, will  work on it, thanks for your review.

Anmol Karn
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Re: [Linux-kernel-mentees] [PATCH] net: bluetooth: Fix null pointer dereference in hci_event_packet()

[Anmol Karn]

On Thu, Sep 10, 2020 at 01:49:18PM +0300, Dan Carpenter wrote:
> On Thu, Sep 10, 2020 at 10:04:24AM +0530, Anmol Karn wrote:
> > Prevent hci_phy_link_complete_evt() from dereferencing 'hcon->amp_mgr'
> > as NULL. Fix it by adding pointer check for it.
> > 
> > Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com
> > Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f
> > Signed-off-by: Anmol Karn <anmol.karan123@gmail.com>
> > ---
> >  net/bluetooth/hci_event.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> > index 4b7fc430793c..871e16804433 100644
> > --- a/net/bluetooth/hci_event.c
> > +++ b/net/bluetooth/hci_event.c
> > @@ -4936,6 +4936,11 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
> >  		return;
> >  	}
> >  
> > +	if (IS_ERR_OR_NULL(hcon->amp_mgr)) {
> 
> It can't be an error pointer.  Shouldn't we call hci_conn_del() on this
> path?  Try to find the Fixes tag to explain how this bug was introduced.
> 
> (Don't rush to send a v2.  The patch requires quite a bit more digging
> and detective work before it is ready).
> 
> > +		hci_dev_unlock(hdev);
> > +		return;
> > +	}
> > +
> >  	if (ev->status) {
> >  		hci_conn_del(hcon);
> >  		hci_dev_unlock(hdev);
> 
> regards,
> dan carpenter
> 

Sir,

I need little advice in continuing with this Patch,

I have looked into the Bisected logs and the problem occurs from this commit:

941992d29447 ("ethernet: amd: use IS_ENABLED() instead of checking for built-in or module")


Here is a diff of patch which i modified from last patch,

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 4b7fc430793c..6ce435064e0b 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -4936,6 +4936,12 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
                return;
        }

+       if (!hcon->amp_mgr) {
+               hci_conn_del(hcon);
+               hci_dev_unlock(hdev);
+               return;
+       }
+
        if (ev->status) {
                hci_conn_del(hcon);
                hci_dev_unlock(hdev);


The value of 'hcon->amp_mgr' getting NULL due to hci_conn_hash_lookup_handle call
, and there is not any checks there for the members of hcon, which enables 
hci_phy_link_complete_evt() to dereference 'hcon->amp_mgr' as NULL.

please suggest improvements to this patch.

Regards,
Anmol  
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Re: [Linux-kernel-mentees] [PATCH] net: bluetooth: Fix null pointer dereference in hci_event_packet()

[Dan Carpenter]

On Sat, Sep 12, 2020 at 02:40:28PM +0530, Anmol Karn wrote:
> On Thu, Sep 10, 2020 at 01:49:18PM +0300, Dan Carpenter wrote:
> > On Thu, Sep 10, 2020 at 10:04:24AM +0530, Anmol Karn wrote:
> > > Prevent hci_phy_link_complete_evt() from dereferencing 'hcon->amp_mgr'
> > > as NULL. Fix it by adding pointer check for it.
> > > 
> > > Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com
> > > Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f 
> > > Signed-off-by: Anmol Karn <anmol.karan123@gmail.com>
> > > ---
> > >  net/bluetooth/hci_event.c | 5 +++++
> > >  1 file changed, 5 insertions(+)
> > > 
> > > diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> > > index 4b7fc430793c..871e16804433 100644
> > > --- a/net/bluetooth/hci_event.c
> > > +++ b/net/bluetooth/hci_event.c
> > > @@ -4936,6 +4936,11 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
> > >  		return;
> > >  	}
> > >  
> > > +	if (IS_ERR_OR_NULL(hcon->amp_mgr)) {
> > 
> > It can't be an error pointer.  Shouldn't we call hci_conn_del() on this
> > path?  Try to find the Fixes tag to explain how this bug was introduced.
> > 
> > (Don't rush to send a v2.  The patch requires quite a bit more digging
> > and detective work before it is ready).
> > 
> > > +		hci_dev_unlock(hdev);
> > > +		return;
> > > +	}
> > > +
> > >  	if (ev->status) {
> > >  		hci_conn_del(hcon);
> > >  		hci_dev_unlock(hdev);
> > 
> > regards,
> > dan carpenter
> > 
> 
> Sir,
> 
> I need little advice in continuing with this Patch,
> 
> I have looked into the Bisected logs and the problem occurs from this commit:
> 
> 941992d29447 ("ethernet: amd: use IS_ENABLED() instead of checking for built-in or module")
> 

That's just the patch which made the code testable by syzbot.  It didn't
introduce the bug.

> 
> Here is a diff of patch which i modified from last patch,
> 
> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> index 4b7fc430793c..6ce435064e0b 100644
> --- a/net/bluetooth/hci_event.c
> +++ b/net/bluetooth/hci_event.c
> @@ -4936,6 +4936,12 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
>                 return;
>         }
> 
> +       if (!hcon->amp_mgr) {
> +               hci_conn_del(hcon);
> +               hci_dev_unlock(hdev);

I have no idea if calling hci_conn_del() is really the correct, thing.
I don't know the code at all.  Anyway, do some research and figure out
for sure what the correct thing is.

Also look for similar bugs in other places where hcon->amp_mgr is
dereferenced.  For example, amp_read_loc_assoc_final_data() seems to
have a similar bug.

regards,
dan carpenter

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Re: [Linux-kernel-mentees] [PATCH] net: bluetooth: Fix null pointer dereference in hci_event_packet()

[Anmol Karn]

Hello Sir,
 
> > I have looked into the Bisected logs and the problem occurs from this commit:
> > 
> > 941992d29447 ("ethernet: amd: use IS_ENABLED() instead of checking for built-in or module")
> > 
> 
> That's just the patch which made the code testable by syzbot.  It didn't
> introduce the bug.
> 
> > 
> > Here is a diff of patch which i modified from last patch,
> > 
> > diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> > index 4b7fc430793c..6ce435064e0b 100644
> > --- a/net/bluetooth/hci_event.c
> > +++ b/net/bluetooth/hci_event.c
> > @@ -4936,6 +4936,12 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
> >                 return;
> >         }
> > 
> > +       if (!hcon->amp_mgr) {
> > +               hci_conn_del(hcon);
> > +               hci_dev_unlock(hdev);
> 
> I have no idea if calling hci_conn_del() is really the correct, thing.
> I don't know the code at all.  Anyway, do some research and figure out
> for sure what the correct thing is.

I have created my patch on the basis of the already applied conditions handling
in this function, i.e whenever NULL dereference occurs, connection cleanup is 
required hence, hci_conn_del() is used here. Will see if anything else could be
done.

> 
> Also look for similar bugs in other places where hcon->amp_mgr is
> dereferenced.  For example, amp_read_loc_assoc_final_data() seems to
> have a similar bug.
> 

Sure sir will look into it.

> regards,
> dan carpenter
> 

Thanks,
Anmol
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[Linux-kernel-mentees] [PATCH] net: bluetooth: Fix null pointer dereference in hci_event_packet()

[Anmol Karn]

AMP_MGR is getting derefernced in hci_phy_link_complete_evt(), when called from hci_event_packet() and there is a possibility, that hcon->amp_mgr may not be found when accessing after initialization of hcon.

- net/bluetooth/hci_event.c:4945
The bug seems to get triggered in this line:

bredr_hcon = hcon->amp_mgr->l2cap_conn->hcon;

Fix it by adding a NULL check for the hcon->amp_mgr before checking the ev-status.

Fixes: d5e911928bd8 ("Bluetooth: AMP: Process Physical Link Complete evt") 
Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com 
Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f 
Signed-off-by: Anmol Karn <anmol.karan123@gmail.com>
---
Cahnge in v2:
  - Replaced IS_ERR_OR_NULL check with NULL check only (Suggested by: Dan Carpenter <dan.carpenter@oracle.com>)
  - Added "Fixes:" tag (Suggested by: Dan Carpenter <dan.carpenter@oracle.com>)


 net/bluetooth/hci_event.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 4b7fc430793c..b084142c578e 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -4936,6 +4936,11 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
 		return;
 	}
 
+	if (!hcon->amp_mgr) {
+		hci_dev_unlock(hdev);
+		return 0;
+	}
+
 	if (ev->status) {
 		hci_conn_del(hcon);
 		hci_dev_unlock(hdev);
-- 
2.28.0

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[Linux-kernel-mentees] [PATCH] net: bluetooth: Fix null pointer dereference in hci_event_packet()

[Anmol Karn]

AMP_MGR is getting derefernced in hci_phy_link_complete_evt(), when called from hci_event_packet() and there is a possibility, that hcon->amp_mgr may not be found when accessing after initialization of hcon.

- net/bluetooth/hci_event.c:4945
The bug seems to get triggered in this line:

bredr_hcon = hcon->amp_mgr->l2cap_conn->hcon;

Fix it by adding a NULL check for the hcon->amp_mgr before checking the ev-status.

Fixes: d5e911928bd8 ("Bluetooth: AMP: Process Physical Link Complete evt")
Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com 
Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f 
Signed-off-by: Anmol Karn <anmol.karan123@gmail.com>
---
Change in v3:
  - changed return o; to return; (Reported-by: kernel test robot <lkp@intel.com>
)

 net/bluetooth/hci_event.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 4b7fc430793c..bbe0ca42cad2 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -4936,6 +4936,11 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
 		return;
 	}
 
+	if (!hcon->amp_mgr) {
+		hci_dev_unlock(hdev);
+		return;
+	}
+
 	if (ev->status) {
 		hci_conn_del(hcon);
 		hci_dev_unlock(hdev);
-- 
2.28.0

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Re: [Linux-kernel-mentees] [PATCH] net: bluetooth: Fix null pointer dereference in hci_event_packet()

[Marcel Holtmann]

Hi Anmol,

> AMP_MGR is getting derefernced in hci_phy_link_complete_evt(), when called from hci_event_packet() and there is a possibility, that hcon->amp_mgr may not be found when accessing after initialization of hcon.
> 
> - net/bluetooth/hci_event.c:4945
> The bug seems to get triggered in this line:
> 
> bredr_hcon = hcon->amp_mgr->l2cap_conn->hcon;
> 
> Fix it by adding a NULL check for the hcon->amp_mgr before checking the ev-status.
> 
> Fixes: d5e911928bd8 ("Bluetooth: AMP: Process Physical Link Complete evt")
> Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com 
> Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f 
> Signed-off-by: Anmol Karn <anmol.karan123@gmail.com>
> ---
> Change in v3:
>  - changed return o; to return; (Reported-by: kernel test robot <lkp@intel.com>
> )
> 
> net/bluetooth/hci_event.c | 5 +++++
> 1 file changed, 5 insertions(+)

patch has been applied to bluetooth-next tree.

Regards

Marcel

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Re: [Linux-kernel-mentees] [PATCH] net: bluetooth: Fix null pointer dereference in hci_event_packet()

[Anmol Karn]

On Thu, Oct 01, 2020 at 09:06:42AM +0200, Marcel Holtmann wrote:
> Hi Anmol,
> 
> > AMP_MGR is getting derefernced in hci_phy_link_complete_evt(), when called from hci_event_packet() and there is a possibility, that hcon->amp_mgr may not be found when accessing after initialization of hcon.
> > 
> > - net/bluetooth/hci_event.c:4945
> > The bug seems to get triggered in this line:
> > 
> > bredr_hcon = hcon->amp_mgr->l2cap_conn->hcon;
> > 
> > Fix it by adding a NULL check for the hcon->amp_mgr before checking the ev-status.
> > 
> > Fixes: d5e911928bd8 ("Bluetooth: AMP: Process Physical Link Complete evt")
> > Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com 
> > Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f 
> > Signed-off-by: Anmol Karn <anmol.karan123@gmail.com>
> > ---
> > Change in v3:
> >  - changed return o; to return; (Reported-by: kernel test robot <lkp@intel.com>
> > )
> > 
> > net/bluetooth/hci_event.c | 5 +++++
> > 1 file changed, 5 insertions(+)
> 
> patch has been applied to bluetooth-next tree.
> 
> Regards
> 
> Marcel
> 

Thank you :)

Best,
Anmol
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