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Subject[PATCH 4.14 41/53] drm/vmwgfx: integer underflow in vmw_cmd_dx_set_shader() leading to an invalid read
Date
From: Murray McAllister <murray.mcallister@gmail.com>

commit 5ed7f4b5eca11c3c69e7c8b53e4321812bc1ee1e upstream.

If SVGA_3D_CMD_DX_SET_SHADER is called with a shader ID
of SVGA3D_INVALID_ID, and a shader type of
SVGA3D_SHADERTYPE_INVALID, the calculated binding.shader_slot
will be 4294967295, leading to an out-of-bounds read in vmw_binding_loc()
when the offset is calculated.

Cc: <stable@vger.kernel.org>
Fixes: d80efd5cb3de ("drm/vmwgfx: Initial DX support")
Signed-off-by: Murray McAllister <murray.mcallister@gmail.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>


---
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -2495,7 +2495,8 @@ static int vmw_cmd_dx_set_shader(struct

cmd = container_of(header, typeof(*cmd), header);

- if (cmd->body.type >= SVGA3D_SHADERTYPE_DX10_MAX) {
+ if (cmd->body.type >= SVGA3D_SHADERTYPE_DX10_MAX ||
+ cmd->body.type < SVGA3D_SHADERTYPE_MIN) {
DRM_ERROR("Illegal shader type %u.\n",
(unsigned) cmd->body.type);
return -EINVAL;

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