Re: [PATCH 4.19 185/306] net: hns3: bugfix for buffer not free problem during resetting

[Pavel Machek]

Hi!

> > > From: Huazhong Tan <tanhuazhong@xxxxxxxxxx>
> > > 
> > > [ Upstream commit 73b907a083b8a8c1c62cb494bc9fbe6ae086c460 ]
> > > 
> > > When hns3_get_ring_config()/hns3_queue_to_ring()/
> > > hns3_get_vector_ring_chain() failed during resetting, the allocated
> > > memory has not been freed before these three functions return. So
> > > this patch adds error handler in these functions to fix it.
> > 
> > Correct me if I'm wrong, but... this introduces use-after-free:
> > Should it do devm_kfree(&pdev->dev, cur_chain); ?
> 
> I think Sasha tried to backport a fix for this patch, but that fix broke
> the build :(
> 
> If you want to provide a working backport, I'll be glad to take it.

Actually it looks like problem originated in mainline, and there was
more than one problem with this patch.

cda69d244585bc4497d3bb878c22fe2b6ad647c1 should fix it; it needs to be
back-ported, too.

Best regards,
								Pavel
								
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