linux-kernel - [PATCH 3.16 5/7] drm/vmwgfx: limit the number of mip levels in vmw_gb_surface_define

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Date:   Tue, 27 Jun 2017 12:10:34 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Sinclair Yeh" <syeh@...are.com>,
        "Vladis Dronov" <vdronov@...hat.com>
Subject: [PATCH 3.16 5/7] drm/vmwgfx: limit the number of mip levels in
 vmw_gb_surface_define_ioctl()

3.16.45-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Vladis Dronov <vdronov@...hat.com>

commit ee9c4e681ec4f58e42a83cb0c22a0289ade1aacf upstream.

The 'req->mip_levels' parameter in vmw_gb_surface_define_ioctl() is
a user-controlled 'uint32_t' value which is used as a loop count limit.
This can lead to a kernel lockup and DoS. Add check for 'req->mip_levels'.

References:
https://bugzilla.redhat.com/show_bug.cgi?id=1437431

Signed-off-by: Vladis Dronov <vdronov@...hat.com>
Reviewed-by: Sinclair Yeh <syeh@...are.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -1251,6 +1251,9 @@ int vmw_gb_surface_define_ioctl(struct d
 	const struct svga3d_surface_desc *desc;
 	uint32_t backup_handle;
 
+	if (req->mip_levels > DRM_VMW_MAX_MIP_LEVELS)
+		return -EINVAL;
+
 	if (unlikely(vmw_user_surface_size == 0))
 		vmw_user_surface_size = ttm_round_pot(sizeof(*user_srf)) +
 			128;