Re: [PATCH v5 3.1.0-rc4-tip 3/26] Uprobes: register/unregister probes.

[Srikar Dronamraju <srikar@linux.vnet.ibm.com>]

* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> [2011-09-20 17:50:19]:

> On Tue, Sep 20, 2011 at 05:30:22PM +0530, Srikar Dronamraju wrote:
> > +int register_uprobe(struct inode *inode, loff_t offset,
> > +				struct uprobe_consumer *consumer)
> > +{
> > +	struct uprobe *uprobe;
> > +	int ret = 0;
> > +
> > +	inode = igrab(inode);
> > +	if (!inode || !consumer || consumer->next)
> > +		return -EINVAL;
> > +
> > +	if (offset > inode->i_size)
> > +		return -EINVAL;
> > +
> > +	mutex_lock(&inode->i_mutex);
> > +	uprobe = alloc_uprobe(inode, offset);
> > +	if (!uprobe)
> > +		return -ENOMEM;
> 
> The error returns above don't iput(inode).  And inode->i_mutex stays
> locked on this return.

Yes will fix this .. by clubbing the !uprobe with the next condition.
Thanks for pointing this.

> 
> > +void unregister_uprobe(struct inode *inode, loff_t offset,
> > +				struct uprobe_consumer *consumer)
> > +{
> > +	struct uprobe *uprobe;
> > +
> > +	inode = igrab(inode);
> > +	if (!inode || !consumer)
> > +		return;
> > +
> > +	if (offset > inode->i_size)
> > +		return;
> > +
> > +	uprobe = find_uprobe(inode, offset);
> > +	if (!uprobe)
> > +		return;
> > +
> > +	if (!del_consumer(uprobe, consumer)) {
> > +		put_uprobe(uprobe);
> > +		return;
> > +	}
> 
> More returns that do not iput(inode).

Yes. will fix these too.

-- 
Thanks and Regards
Srikar

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