linux-kernel - [PATCH 3.12 01/86] drm/vmwgfx: NULL pointer dereference in vmw_surface_define

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Message-Id: <13a6a971c9165237531c2870da03084a6becc905.1493888632.git.jslaby@suse.cz>
Date:   Thu,  4 May 2017 11:03:26 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Murray McAllister <murray.mcallister@...omniasec.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 01/86] drm/vmwgfx: NULL pointer dereference in vmw_surface_define_ioctl()

From: Murray McAllister <murray.mcallister@...omniasec.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 36274ab8c596f1240c606bb514da329add2a1bcd upstream.

Before memory allocations vmw_surface_define_ioctl() checks the
upper-bounds of a user-supplied size, but does not check if the
supplied size is 0.

Add check to avoid NULL pointer dereferences.

Signed-off-by: Murray McAllister <murray.mcallister@...omniasec.com>
Reviewed-by: Sinclair Yeh <syeh@...are.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index 582814339748..a518493836a0 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -680,8 +680,8 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
 	for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i)
 		num_sizes += req->mip_levels[i];
 
-	if (num_sizes > DRM_VMW_MAX_SURFACE_FACES *
-	    DRM_VMW_MAX_MIP_LEVELS)
+	if (num_sizes > DRM_VMW_MAX_SURFACE_FACES * DRM_VMW_MAX_MIP_LEVELS ||
+	    num_sizes == 0)
 		return -EINVAL;
 
 	size = vmw_user_surface_size + 128 +
-- 
2.12.2