[PATCH 33/41] fbcon: Check if the character count can be handled

[PATCH 33/41] fbcon: Check if the character count can be handled

[Antonino A. Daplas]

Fontmaps can be 256 or 512 in length. The only driver that can do tileblitting
can only handle 256 characters.  Check for this when setting the font.

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
---

 drivers/video/console/fbcon.c |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index c71a88d..6fc3501 100644
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -685,6 +685,17 @@ static void set_blitting_type(struct vc_
 		fbcon_set_bitops(ops);
 	}
 }
+
+static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
+{
+	int err = 0;
+
+	if (info->flags & FBINFO_MISC_TILEBLITTING &&
+	    info->tileops->fb_get_tilemax(info) < charcount)
+		err = 1;
+
+	return err;
+}
 #else
 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
 {
@@ -695,6 +706,12 @@ static void set_blitting_type(struct vc_
 	fbcon_set_rotation(info);
 	fbcon_set_bitops(ops);
 }
+
+static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)
+{
+	return 0;
+}
+
 #endif /* CONFIG_MISC_TILEBLITTING */
 
 
@@ -2518,6 +2535,10 @@ static int fbcon_set_font(struct vc_data
 	    !(info->pixmap.blit_y & (1 << (font->height - 1))))
 		return -EINVAL;
 
+	/* Make sure driver can handle the font length */
+	if (fbcon_invalid_charcount(info, charcount))
+		return -EINVAL;
+
 	size = h * pitch * charcount;
 
 	new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, GFP_USER);


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