863d528a9f
When fbBresSolid draws a line, it can happen that after the last pixel, the Bresenham error term overflows, and fbBresSolid paints another pixel before adjusting the error term. However, if this happens on the last pixel (len=0), this extra pixel might overshoot the boundary, and, in rare cases, lead to a segfault. Fix this issue by adjusting for the Bresenham error term before drawing the main pixel, not after. Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=24274 Signed-off-by: Simon Schubert <2@0x2c.or> Tested-by: Mitch Davis <mjd+freedesktop.org@afork.com> Signed-off-by: Matt Turner <mattst88@gmail.com> Signed-off-by: Keith Packard <keithp@keithp.com>
X Server
The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.
Windows are then composed on the actual screen by the X server
(or by a separate composite manager) as directed by the window manager,
which usually communicates with the user via graphical controls such as buttons
and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the
following article:
http://en.wikipedia.org/wiki/X_server
All questions regarding this software should be directed at the
Xorg mailing list:
http://lists.freedesktop.org/mailman/listinfo/xorg
Please submit bug reports to the Xorg bugzilla:
https://bugs.freedesktop.org/enter_bug.cgi?product=xorg
The master development code repository can be found at:
git://anongit.freedesktop.org/git/xorg/xserver
http://cgit.freedesktop.org/xorg/xserver
For patch submission instructions, see:
http://www.x.org/wiki/Development/Documentation/SubmittingPatches
For more information on the git code manager, see:
http://wiki.x.org/wiki/GitPage