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Alan Coopersmith 4a91a2f1be 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>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1730>
(cherry picked from commit d10589cc09)
2026-01-25 10:39:58 -08:00
.gitlab-ci CI: update meson from 0.56.2 (bullseye) to 1.0.0 (bullseye-backports) 2026-01-25 10:39:57 -08:00
composite dix: unexport Ones() 2026-01-25 10:39:57 -08:00
config treewide: replace xnfcalloc() calls by XNFcallocarray() 2026-01-25 10:39:55 -08:00
damageext prevent name clash on Windows w/ RT_* defines 2026-01-19 12:48:30 -08:00
dbe treewide: fix indentions got broke by recent commit 2026-01-25 10:39:56 -08:00
dix dix: Use __builtin_popcountl if available to replace Ones() 2026-01-25 10:39:57 -08:00
doc doc: drop removed functions from the Xserver spec 2026-01-25 10:39:56 -08:00
dri3 treewide: replace xnfalloc() calls to XNFalloc() 2026-01-25 10:39:55 -08:00
exa Move sizeof to second argument in calloc calls 2026-01-25 10:39:55 -08:00
fb dix: unexport Ones() 2026-01-25 10:39:57 -08:00
glamor include: dixfontstr.h: drop silent dependency on libxfont2 2026-01-25 10:39:56 -08:00
glx treewide: replace xnfstrdup() calls by XNFstrdup() 2026-01-25 10:39:55 -08:00
hw xfree86: avoid memory leak on realloc failure 2026-01-25 10:39:57 -08:00
include dix: unexport Ones() 2026-01-25 10:39:57 -08:00
man Xserver.man: Note that -byteswappedclients is the default in this release 2026-01-19 12:32:23 -08:00
mi mi: drop obsolete mibitblt.c 2026-01-25 10:39:56 -08:00
miext os: move os_move_fd() out of public API 2026-01-19 12:32:20 -08:00
os dix: Use __builtin_popcountl if available to replace Ones() 2026-01-25 10:39:57 -08:00
present build: Move epoll dependency check 2026-01-25 10:39:56 -08:00
pseudoramiX pseudoramix: replace PseudoramiXTrace & PseudoramiXDebug by LogMessageVerb 2026-01-25 10:39:57 -08:00
randr randr: fix wrong call to RRGetScreenResources() in swapped case 2026-01-25 10:39:57 -08:00
record record: clean up Sun/Solaris specific hack 2026-01-25 10:39:53 -08:00
render dix: unexport Ones() 2026-01-25 10:39:57 -08:00
test test: dix_input_valuator_masks(): use fixed array instead of VLA 2026-01-25 10:39:56 -08:00
Xext dix: unexport Ones() 2026-01-25 10:39:57 -08:00
xfixes Move sizeof to second argument in calloc calls 2026-01-25 10:39:55 -08:00
Xi Xi: avoid NULL pointer dereference if GetXTestDevice returns NULL 2026-01-25 10:39:58 -08:00
xkb dix: unexport Ones() 2026-01-25 10:39:57 -08:00
.appveyor.yml appveyor: Add libxcvt build dep 2021-11-04 13:03:25 +00:00
.dir-locals.el .dir-locals.el: Add missing final newline 2019-10-01 17:05:28 +00:00
.gitignore Clean up the .gitignore file 2024-01-12 00:50:24 +00:00
.gitlab-ci.yml ci: reduce nolibdecor build to xwayland only 2026-01-25 10:39:57 -08:00
.mailmap Add a .mailmap file to canonicalize author names and emails 2023-03-15 18:10:51 +00:00
.travis.yml travis: Add OSX meson build to matrix 2019-05-02 15:42:58 +00:00
COPYING modesetting: Merge modesetting's COPYING into the xserver's. 2014-09-15 12:46:02 -07:00
meson.build meson: list required version of xproto headers in xorg-server.pc 2026-01-25 10:39:57 -08:00
meson_options.txt os: drop SUN-DES-1 authentication 2026-01-25 10:39:53 -08:00
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