[PATCH] drm/i915: fix task reference leak in i915_debugfs.c

[Daniel Vetter]

On Fri, Sep 25, 2015 at 02:16:07PM +0300, Jani Nikula wrote:
> On Fri, 25 Sep 2015, Geliang Tang <geliangtang at 163.com> wrote:
> > Leak a task reference in i915_ppgtt_info(), add put_task_struct()
> > to fix it.
> 
> Introduced by
> 
> commit 1c60fef535d143860d5bf6593e24ab6417f5227c
> Author: Ben Widawsky <ben at bwidawsk.net>
> Date:   Fri Dec 6 14:11:30 2013 -0800
> 
>     drm/i915: Dump all ppgtt

Queued for -next, thanks for the patch.
-Daniel

> 
> 
> >
> > Signed-off-by: Geliang Tang <geliangtang at 163.com>
> > ---
> >  drivers/gpu/drm/i915/i915_debugfs.c | 8 ++++++--
> >  1 file changed, 6 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> > index 5615d3d..8797717 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -2288,9 +2288,13 @@ static int i915_ppgtt_info(struct seq_file *m, void *data)
> >  
> >  	list_for_each_entry_reverse(file, &dev->filelist, lhead) {
> >  		struct drm_i915_file_private *file_priv = file->driver_priv;
> > +		struct task_struct *task;
> >  
> > -		seq_printf(m, "\nproc: %s\n",
> > -			   get_pid_task(file->pid, PIDTYPE_PID)->comm);
> > +		task = get_pid_task(file->pid, PIDTYPE_PID);
> > +		if (!task)
> > +			return -ESRCH;
> > +		seq_printf(m, "\nproc: %s\n", task->comm);
> > +		put_task_struct(task);
> >  		idr_for_each(&file_priv->context_idr, per_file_ctx,
> >  			     (void *)(unsigned long)m);
> >  	}
> > -- 
> > 1.9.1
> >
> >
> 
> -- 
> Jani Nikula, Intel Open Source Technology Center
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> dri-devel at lists.freedesktop.org
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch