linux-kernel - Re: [PATCH] nouveau: Do not leak in nv20_graph

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Date:	Sun, 3 Jul 2011 13:21:55 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	Paul Menzel <paulepanter@...rs.sourceforge.net>
cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nouveau: Do not leak in nv20_graph_create

On Sun, 3 Jul 2011, Jesper Juhl wrote:

> On Sun, 3 Jul 2011, Paul Menzel wrote:
> 
> > Dear Jesper,
> > 
> > 
> > Am Sonntag, den 03.07.2011, 12:25 +0200 schrieb Jesper Juhl:
> > > If we return due to an unknown chipset in 
> > > drivers/gpu/drm/nouveau/nv20_graph.c:nv20_graph_create() we'll leak the 
> > > memory allocated to 'pgraph'.
> > > 
> > > This patch should fix the leak and it also disambiguates the "PGRAPH:
> > > unknown chipset\n" error message - it's nice to be able to tell which
> > > branch created the error which is impossible if the error messages are
> > > 100% identical.
> > > 
> > > Signed-off-by: Jesper Juhl <jj@...osbits.net>
> > > ---
> > >  drivers/gpu/drm/nouveau/nv20_graph.c |    4 +++-
> > >  1 files changed, 3 insertions(+), 1 deletions(-)
> > > 
> > >   Don't have the hardware, so compile tested only.
> > > 
> > > diff --git a/drivers/gpu/drm/nouveau/nv20_graph.c b/drivers/gpu/drm/nouveau/nv20_graph.c
> > > index affc7d7..059ad65 100644
> > > --- a/drivers/gpu/drm/nouveau/nv20_graph.c
> > > +++ b/drivers/gpu/drm/nouveau/nv20_graph.c
> > > @@ -752,6 +752,7 @@ nv20_graph_create(struct drm_device *dev)
> > >  			pgraph->grctx_user = 0x0000;
> > >  			break;
> > >  		default:
> > > +			kfree(pgraph);
> > >  			NV_ERROR(dev, "PGRAPH: unknown chipset\n");
> > >  			return 0;
> > >  		}
> > > @@ -773,7 +774,8 @@ nv20_graph_create(struct drm_device *dev)
> > >  			pgraph->grctx_size = NV35_36_GRCTX_SIZE;
> > >  			break;
> > >  		default:
> > > -			NV_ERROR(dev, "PGRAPH: unknown chipset\n");
> > > +			kfree(pgraph);
> > > +			NV_ERROR(dev, "PGRAPH: unknown chipset.\n");
> > 
> > so the only disambiguation is the full stop at the end?
> > 
> Yeah. I guess I could have reworded the text, but I settled on just adding 
> that "."...
> 
I guess this is better : 


From: Jesper Juhl <jj@...osbits.net>
Subject: [PATCH] nouveau: Do not leak in nv20_graph_create

If we return due to an unknown chipset in drivers/gpu/drm/nouveau/nv20_graph.c:nv20_graph_create() we'll leak the memory allocated to 'pgraph'.

This patch should fix the leak and it also disambiguates the "PGRAPH:
unknown chipset\n" error message - it's nice to be able to tell which
branch created the error which is impossible if the error messages are
100% identical.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 drivers/gpu/drm/nouveau/nv20_graph.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nv20_graph.c b/drivers/gpu/drm/nouveau/nv20_graph.c
index affc7d7..53cbe84 100644
--- a/drivers/gpu/drm/nouveau/nv20_graph.c
+++ b/drivers/gpu/drm/nouveau/nv20_graph.c
@@ -752,6 +752,7 @@ nv20_graph_create(struct drm_device *dev)
 			pgraph->grctx_user = 0x0000;
 			break;
 		default:
+			kfree(pgraph);
 			NV_ERROR(dev, "PGRAPH: unknown chipset\n");
 			return 0;
 		}
@@ -773,7 +774,8 @@ nv20_graph_create(struct drm_device *dev)
 			pgraph->grctx_size = NV35_36_GRCTX_SIZE;
 			break;
 		default:
-			NV_ERROR(dev, "PGRAPH: unknown chipset\n");
+			kfree(pgraph);
+			NV_ERROR(dev, "PGRAPH: chipset unknown.\n");
 			return 0;
 		}
 	}
-- 
1.7.6



-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
Don't top-post http://www.catb.org/jargon/html/T/top-post.html
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