[Qemu-devel] [PATCH stable-0.15 24/36] console: Fix rendering of VGA underline

["Andreas Färber" <afaerber@suse.de>]

From: Markus Armbruster <armbru@redhat.com>

vga_putcharxy()'s underline code sets font_data to 0xffff instead of
0xff.  vga_putcharxy() then reads dmask16[0xffff >> 4] and
dmask4[0xffff >> 6].  In practice, these out-of-bounds subscripts
"only" put a few crap bits into the display surface.

For 32 bit pixels, there's no array access.  font_data's extra bits go
straight into the display surface.

Broken when commit 6d6f7c28 implemented underline.

Spotted by Coverity.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
(cherry picked from commit 439229c7cb97f6c4cddd3965c3e9d2b8319fe83c)

Signed-off-by: Bruce Rogers <brogers@suse.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
---
 console.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/console.c b/console.c
index 242086c..07c82b8 100644
--- a/console.c
+++ b/console.c
@@ -461,7 +461,7 @@ static void vga_putcharxy(DisplayState *ds, int x, int y, int ch,
             font_data = *font_ptr++;
             if (t_attrib->uline
                 && ((i == FONT_HEIGHT - 2) || (i == FONT_HEIGHT - 3))) {
-                font_data = 0xFFFF;
+                font_data = 0xFF;
             }
             ((uint32_t *)d)[0] = (dmask16[(font_data >> 4)] & xorcol) ^ bgcol;
             ((uint32_t *)d)[1] = (dmask16[(font_data >> 0) & 0xf] & xorcol) ^ bgcol;
@@ -474,7 +474,7 @@ static void vga_putcharxy(DisplayState *ds, int x, int y, int ch,
             font_data = *font_ptr++;
             if (t_attrib->uline
                 && ((i == FONT_HEIGHT - 2) || (i == FONT_HEIGHT - 3))) {
-                font_data = 0xFFFF;
+                font_data = 0xFF;
             }
             ((uint32_t *)d)[0] = (dmask4[(font_data >> 6)] & xorcol) ^ bgcol;
             ((uint32_t *)d)[1] = (dmask4[(font_data >> 4) & 3] & xorcol) ^ bgcol;
@@ -487,7 +487,7 @@ static void vga_putcharxy(DisplayState *ds, int x, int y, int ch,
         for(i = 0; i < FONT_HEIGHT; i++) {
             font_data = *font_ptr++;
             if (t_attrib->uline && ((i == FONT_HEIGHT - 2) || (i == FONT_HEIGHT - 3))) {
-                font_data = 0xFFFF;
+                font_data = 0xFF;
             }
             ((uint32_t *)d)[0] = (-((font_data >> 7)) & xorcol) ^ bgcol;
             ((uint32_t *)d)[1] = (-((font_data >> 6) & 1) & xorcol) ^ bgcol;
-- 
1.7.7