[-fixes,1/9] drm/vmwgfx: limit the number of mip levels in vmw_gb_surface_define_ioctl()
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Message ID 1496841865-2349-1-git-send-email-thellstrom@vmware.com
State New
Headers show

Commit Message

Thomas Hellstrom June 7, 2017, 1:24 p.m. UTC
From: Vladis Dronov <vdronov@redhat.com>

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

Cc: <stable@vger.kernel.org>
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 3 +++
 1 file changed, 3 insertions(+)

Patch
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diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index 7681341..baf03d4 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -1279,6 +1279,9 @@  int vmw_gb_surface_define_ioctl(struct drm_device *dev, void *data,
 	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;