linux-kernel - [075/244] drm/nouveau: properly handle allocation failure in nouveau_sgdma

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Date:	Wed, 28 Sep 2011 15:00:39 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Marcin Slusarz <marcin.slusarz@...il.com>,
	Ben Skeggs <bskeggs@...hat.com>
Subject: [075/244] drm/nouveau: properly handle allocation failure in nouveau_sgdma_populate

3.0-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Marcin Slusarz <marcin.slusarz@...il.com>

commit 17c8b960930da3599e47801a54ac0ea1070545d2 upstream.

Not cleaning after alloc failure would result in crash on destroy,
because nouveau_sgdma_clear assumes "ttm_alloced" to be not null when
"pages" is not null.

Signed-off-by: Marcin Slusarz <marcin.slusarz@...il.com>
Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/nouveau/nouveau_sgdma.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/nouveau/nouveau_sgdma.c
+++ b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
@@ -37,8 +37,11 @@ nouveau_sgdma_populate(struct ttm_backen
 		return -ENOMEM;
 
 	nvbe->ttm_alloced = kmalloc(sizeof(bool) * num_pages, GFP_KERNEL);
-	if (!nvbe->ttm_alloced)
+	if (!nvbe->ttm_alloced) {
+		kfree(nvbe->pages);
+		nvbe->pages = NULL;
 		return -ENOMEM;
+	}
 
 	nvbe->nr_pages = 0;
 	while (num_pages--) {


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