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greybus: es1/2: fix use-after-free in completion callback

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Reset the hcpriv field before returning the message to greybus core in
the OUT-URB completion callback.

This fixes a use-after-free bug when sending responses to incoming
requests as the final reference is then dropped when the message is
returned.

Reported-by: Michael Scott <michael.scott@linaro.org>
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Johan Hovold 2015-09-26 14:37:59 -07:00 committed by Greg Kroah-Hartman
parent 336dfeaba1
commit 58c85123d9
2 changed files with 8 additions and 8 deletions
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8
drivers/staging/greybus/es1.c
View file

@ -397,16 +397,16 @@ static void cport_out_callback(struct urb *urb)
gb_message_cport_clear(message->header);
spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
message->hcpriv = NULL;
spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
/*
* Tell the submitter that the message send (attempt) is
* complete, and report the status.
*/
greybus_message_sent(hd, message, status);
spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
message->hcpriv = NULL;
spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
free_urb(es1, urb);
}

8
drivers/staging/greybus/es2.c
View file

@ -506,16 +506,16 @@ static void cport_out_callback(struct urb *urb)
gb_message_cport_clear(message->header);
spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
message->hcpriv = NULL;
spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
/*
* Tell the submitter that the message send (attempt) is
* complete, and report the status.
*/
greybus_message_sent(hd, message, status);
spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
message->hcpriv = NULL;
spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
free_urb(es1, urb);
}