linux-kernel - [PATCH 4.4 70/90] drm/vmwgfx: limit the number of mip levels in vmw_gb_surface_define

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Message-Id: <20170612152601.201489417@linuxfoundation.org>
Date:   Mon, 12 Jun 2017 17:26:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vladis Dronov <vdronov@...hat.com>,
        Sinclair Yeh <syeh@...are.com>
Subject: [PATCH 4.4 70/90] drm/vmwgfx: limit the number of mip levels in vmw_gb_surface_define_ioctl()

4.4-stable 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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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
@@ -1293,6 +1293,9 @@ int vmw_gb_surface_define_ioctl(struct d
 	if (req->multisample_count != 0)
 		return -EINVAL;
 
+	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;