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drm/vmwgfx: integer underflow in vmw_cmd_dx_set_shader() leading to an invalid read

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commit 5ed7f4b5ec 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: d80efd5cb3 ("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>
This commit is contained in:
Murray McAllister
2019-05-20 21:57:34 +12:00
committed by Greg Kroah-Hartman
parent 4739012890
commit 956916b542
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
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@@ -2495,7 +2495,8 @@ static int vmw_cmd_dx_set_shader(struct vmw_private *dev_priv,
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;