We check that "byte" isn't writing beyond the end of the array but we
also need to prevent array underflow.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/qxl/qxl_ioctl.c b/drivers/gpu/drm/qxl/qxl_ioctl.c
index b2db482..552dc06 100644
--- a/drivers/gpu/drm/qxl/qxl_ioctl.c
+++ b/drivers/gpu/drm/qxl/qxl_ioctl.c
@@ -372,7 +372,7 @@ static int qxl_clientcap_ioctl(struct drm_device *dev, void *data,
{
struct qxl_device *qdev = dev->dev_private;
struct drm_qxl_clientcap *param = data;
- int byte, idx;
+ unsigned int byte, idx;
byte = param->index / 8;
idx = param->index % 8;
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