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Alan Coopersmith cec3e55ec9 Xi: avoid NULL pointer dereference if GetXTestDevice returns NULL 
The comments in that function say "This only happens if master is a
slave device. don't do that" but static analysis doesn't respect that.

Found by Oracle Parfait 13.3:
   Null pointer dereference [null-pointer-deref]:
      Read from null pointer XTestptr
        at line 274 of Xi/xichangehierarchy.c in function 'remove_master'.
          Null pointer introduced at line 691 of Xext/xtest.c in function
	   'GetXTestDevice'.
          Function GetXTestDevice may return constant 'NULL' at line 691,
	   called at line 273 of Xi/xichangehierarchy.c in function
	   'remove_master'.
   Null pointer dereference [null-pointer-deref]:
      Read from null pointer XTestkeybd
        at line 279 of Xi/xichangehierarchy.c in function 'remove_master'.
          Null pointer introduced at line 691 of Xext/xtest.c in function
	   'GetXTestDevice'.
          Function GetXTestDevice may return constant 'NULL' at line 691,
	   called at line 278 of Xi/xichangehierarchy.c in function
	   'remove_master'.

Fixes: 0814f511d ("input: store the master device's ID in the devPrivate for XTest devices.")
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
(cherry picked from commit d10589cc09)

Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1767>
2025-02-05 15:02:23 +01:00
.gitlab-ci ci: Install libxcvt from git 2021-08-06 11:29:29 +00:00
composite composite: Fix use-after-free of the COW 2023-03-29 14:20:26 +02:00
config config: add a quirk for Apple Silicon appledrm 2024-12-02 16:11:51 +00:00
damageext More missing version checks in SProcs 2021-08-08 12:43:01 +00:00
dbe meson: hide C API if Xorg is disabled (like autotools) 2021-03-11 00:22:36 +00:00
dix dix: don't push the XKB state to a non-existing master keyboard 2025-02-05 15:02:23 +01:00
doc meson: Implement developer documentation build 2021-08-20 10:26:07 +00:00
dri3 meson: hide C API if Xorg is disabled (like autotools) 2021-03-11 00:22:36 +00:00
exa exa: rename some badly named variables 2020-07-10 06:17:40 +10:00
fb meson: hide C API if Xorg is disabled (like autotools) 2021-03-11 00:22:36 +00:00
glamor glamor: Fix possible double-free 2025-02-05 15:02:23 +01:00
glx glx: Call XACE hooks on the GLX buffer 2024-01-16 09:58:09 +01:00
hw xfree86: avoid memory leak on realloc failure 2025-02-05 15:02:23 +01:00
include dix-config.h: add HAVE_SOCKLEN_T definition 2024-10-30 17:12:06 -07:00
m4 Add ax_pthread.m4 to m4/ 2016-05-29 19:20:51 -07:00
man Allow disabling byte-swapped clients 2024-03-23 14:42:15 -07:00
mi mi: fix rounding issues around zero in miPointerSetPosition 2024-04-05 13:46:40 +10:00
miext rootless: Add additional debug logging to help triage XQuartz fb/rootless/damage crashes 2022-12-21 01:23:50 -08:00
os os: NextDPMSTimeout: mark intentional fallthroughs in switch 2025-02-05 15:02:23 +01:00
present present: Send a PresentConfigureNotify event for destroyed windows 2023-04-24 10:13:27 +02:00
pseudoramiX Unvalidated lengths 2017-10-10 23:33:34 +02:00
randr Removing the code that deletes an existing monitor in RRMonitorAdd 2024-01-03 08:42:34 +01:00
record record: Fix out of bounds access in SwapCreateRegister() 2021-12-15 10:41:18 +02:00
render render: Avoid possible double-free in ProcRenderAddGlyphs() 2024-04-09 09:26:21 +02:00
test tests: Fix build failure from missing micmap.c 2022-06-26 03:03:26 -07:00
Xext Xext: SProcSyncCreateFence needs to swap drawable id too 2024-03-27 19:39:19 +00:00
xfixes xfixes: Fix out of bounds access in *ProcXFixesCreatePointerBarrier() 2021-12-15 10:41:19 +02:00
Xi Xi: avoid NULL pointer dereference if GetXTestDevice returns NULL 2025-02-05 15:02:23 +01:00
xkb xkb: Fix buffer overflow in _XkbSetCompatMap() 2024-10-29 16:24:59 +01:00
.appveyor.yml Drop DMX DDX 2021-09-07 09:34:31 +00:00
.dir-locals.el .dir-locals.el: Add missing final newline 2019-10-01 17:05:28 +00:00
.gitignore .gitignore: Add new autotools file 'test-driver' 2014-04-21 13:41:42 -07:00
.gitlab-ci.yml ci: Install libxcvt from git 2021-08-06 11:29:29 +00:00
.travis.yml travis: Add OSX meson build to matrix 2019-05-02 15:42:58 +00:00
autogen.sh autogen: Set a default subject prefix for patches 2016-02-08 17:41:38 -05:00
configure.ac xserver 21.1.15 2024-12-17 12:39:36 -05:00
COPYING modesetting: Merge modesetting's COPYING into the xserver's. 2014-09-15 12:46:02 -07:00
devbook.am doc: Create a script to filter xmlto output 2015-01-05 14:24:06 -08:00
docbook.am docbook.am: embed css styles inside the HTML HEAD element 2011-09-21 14:07:49 -07:00
Makefile.am Makefile.am: Add missing meson build files to release tarball 2021-11-06 21:22:23 +02:00
manpages.am man: Fix automake seddery 2018-05-08 12:15:30 -04:00
meson.build xserver 21.1.15 2024-12-17 12:39:36 -05:00
meson_options.txt meson: Provide options to set CFBundleVersion and CFBundleVersionString in XQuartz 2022-06-19 23:10:48 -07:00
README.md Fix spelling/wording issues 2020-07-05 13:07:33 -07:00
xorg-server.m4 xorg-server.m4: just all cflags instead of just sdkdir 2018-09-20 20:12:24 +01:00
xorg-server.pc.in xfree86: link modules against Xorg symbols on Cygwin 2012-04-05 21:57:07 -05:00
xserver.ent.in doc: relocate xserver.ent in the package root directory 2011-05-14 11:22:26 -07:00

README.md

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: https://en.wikipedia.org/wiki/X_server

All questions regarding this software should be directed at the Xorg mailing list:

https://lists.freedesktop.org/mailman/listinfo/xorg

The primary development code repository can be found at:

https://gitlab.freedesktop.org/xorg/xserver

For patch submission instructions, see:

https://www.x.org/wiki/Development/Documentation/SubmittingPatches

As with other projects hosted on freedesktop.org, X.Org follows its Code of Conduct, based on the Contributor Covenant. Please conduct yourself in a respectful and civilized manner when using the above mailing lists, bug trackers, etc:

https://www.freedesktop.org/wiki/CodeOfConduct