[PATCH AUTOSEL 4.14 092/371] drm/etnaviv: potential NULL dereference

From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Dan Carpenter <dan.carpenter@oracle.com>,
	Christian Gmeiner <christian.gmeiner@gmail.com>,
	Lucas Stach <l.stach@pengutronix.de>,
	Sasha Levin <sashal@kernel.org>,
	etnaviv@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org
Subject: [PATCH AUTOSEL 4.14 092/371] drm/etnaviv: potential NULL dereference
Date: Thu, 16 Jan 2020 12:19:24 -0500	[thread overview]
Message-ID: <20200116172403.18149-35-sashal@kernel.org> (raw)
In-Reply-To: <20200116172403.18149-1-sashal@kernel.org>

From: Dan Carpenter <dan.carpenter@oracle.com>

[ Upstream commit 9e05352340d3a3e68c144136db9810b26ebb88c3 ]

The etnaviv_gem_prime_get_sg_table() is supposed to return error
pointers.  Otherwise it can lead to a NULL dereference when it's called
from drm_gem_map_dma_buf().

Fixes: 5f4a4a73f437 ("drm/etnaviv: fix gem_prime_get_sg_table to return new SG table")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
index ae884723e9b1..880b95511b98 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
@@ -26,7 +26,7 @@ struct sg_table *etnaviv_gem_prime_get_sg_table(struct drm_gem_object *obj)
 	int npages = obj->size >> PAGE_SHIFT;
 
 	if (WARN_ON(!etnaviv_obj->pages))  /* should have already pinned! */
-		return NULL;
+		return ERR_PTR(-EINVAL);
 
 	return drm_prime_pages_to_sg(etnaviv_obj->pages, npages);
 }
-- 
2.20.1

