CSI H can be used to position the cursor. The calling application may specify a location that is beyond the limits of the screen. This may lead to an illegal memory access.
Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de --- drivers/video/vidconsole-uclass.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/video/vidconsole-uclass.c b/drivers/video/vidconsole-uclass.c index f1d3ad3611..0c36a5de0a 100644 --- a/drivers/video/vidconsole-uclass.c +++ b/drivers/video/vidconsole-uclass.c @@ -213,6 +213,14 @@ static void vidconsole_escape_char(struct udevice *dev, char ch) s++; /* ; */ s = parsenum(s, &col);
+ /* + * Ensure we stay in the bounds of the screen. + */ + if (row >= priv->rows) + row = priv->rows - 1; + if (col >= priv->cols) + col = priv->cols - 1; + priv->ycur = row * priv->y_charsize; priv->xcur_frac = priv->xstart_frac + VID_TO_POS(col * priv->x_charsize);