[PATCH 2/3] vgacon: Fix sanity checking in vgacon_resize

[PATCH 2/3] vgacon: Fix sanity checking in vgacon_resize

[Antonino A. Daplas]

Reported by: walt <wa1ter@myrealbox.com>

"I routinely switch the console font during bootup to
8x8 so I can get 50 lines per screen.  Until 09 Sept,
just changing to the small font automatically gave me
all 50 lines -- but now I'm only getting 25 lines even
with the small font.  The bottom half of the screen
displays the text that already scrolled off the top."

This bug is due to an erroneous check in the recently added hook,
vgacon_resize(). It checks the new height against the original number of
rows of the console. Because the original number of rows depends on both
the scanline and the font height, check it instead against the
scanline/fontheight.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
---
 vgacon.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletion(-)


diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -1020,7 +1020,9 @@ static int vgacon_font_get(struct vc_dat
 static int vgacon_resize(struct vc_data *c, unsigned int width,
 				unsigned int height)
 {
-	if (width % 2 || width > ORIG_VIDEO_COLS || height > ORIG_VIDEO_LINES)
+	if (width % 2 || width > ORIG_VIDEO_COLS ||
+	    height > (ORIG_VIDEO_LINES * vga_default_font_height)/
+	    c->vc_font.height)
 		return -EINVAL;
 
 	if (CON_IS_VISIBLE(c) && !vga_is_gfx) /* who knows */



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