GNU bug report logs - #42673
26.3; Return value of XGetIMValues not checked in xim_open_dpy (src/xterm.c)

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Package: emacs;

Reported by: Yichao Yu <yyc1992 <at> gmail.com>

Date: Sun, 2 Aug 2020 13:24:01 UTC

Severity: normal

Merged with 42676, 42677

Found in versions 26.3, 27.1

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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From: Yichao Yu <yyc1992 <at> gmail.com>
To: 42673 <at> debbugs.gnu.org
Cc: Yichao Yu <yyc1992 <at> gmail.com>
Subject: bug#42673: 26.3; Return value of XGetIMValues not checked in xim_open_dpy (src/xterm.c)
Date: Sun, 2 Aug 2020 09:22:53 -0400

The call in question is at
https://git.savannah.gnu.org/cgit/emacs.git/tree/src/xterm.c?id=9fe2bdb88a4ebd4b2286c1c2a2a2ba7411af01b6#n10316
Since the return value isn't checked, a failure to initialize here can
cause `dpyinfo->xim_styles` to be `NULL` which intern cause readers
like https://git.savannah.gnu.org/cgit/emacs.git/tree/src/xfns.c?id=9fe2bdb88a4ebd4b2286c1c2a2a2ba7411af01b6#n2659
to pass a `NULL` pointer to `best_xim_style` and crash.

The fix is to check if the return value of `XGetIMValues` is not
`NULL` and if it is not `NULL`, disable XIM.

It currently triggers due to
https://gitlab.freedesktop.org/xorg/lib/libx11/-/issues/116 but this
function can also fail for other reasons including bugs on the input
method side. It's not guaranteed to success and a failure in this
function should not cause emacs itself to crash...

In GNU Emacs 26.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.21)

of 2020-07-29 built on yyc.yyc-arch.org

Repository revision: d9eea1ad1bca16406a6d4c9bd0daa57a9d0a531f

System Description: Arch Linux


Recent messages:

For information about GNU Emacs and the GNU system, type C-h C-a.

user-error: Beginning of history; no preceding item [2 times]

Making completion list...

Quit

C-x C-g is undefined


Configured using:

'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib

--localstatedir=/var --with-x-toolkit=gtk3 --with-xft --with-wide-int

--with-modules 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt

-g -fvar-tracking-assignments

-fdebug-prefix-map=/home/yuyichao/projects/arch-pkg/pkg/tmp/emacs/repos/extra-x86_64/src=/usr/src/debug

-ggdb3 -O0 -DDEBUG_XIC_FONTSET=1' CPPFLAGS=-D_FORTIFY_SOURCE=2

LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'


Configured features:

XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS GLIB

NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB

TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD LCMS2


Important settings:

value of $LANG: zh_CN.UTF-8

value of $XMODIFIERS: @im=fcitx

locale-coding-system: utf-8-unix


Major mode: Fundamental


Minor modes in effect:

tooltip-mode: t

global-eldoc-mode: t

electric-indent-mode: t

mouse-wheel-mode: t

tool-bar-mode: t

menu-bar-mode: t

file-name-shadow-mode: t

global-font-lock-mode: t

auto-composition-mode: t

auto-encryption-mode: t

auto-compression-mode: t

buffer-read-only: t

line-number-mode: t

transient-mark-mode: t


Load-path shadows:

/usr/share/emacs/site-lisp/org/ox hides /usr/share/emacs/26.3/lisp/org/ox

/usr/share/emacs/site-lisp/org/ox-texinfo hides
/usr/share/emacs/26.3/lisp/org/ox-texinfo

/usr/share/emacs/site-lisp/org/ox-publish hides
/usr/share/emacs/26.3/lisp/org/ox-publish

/usr/share/emacs/site-lisp/org/ox-org hides
/usr/share/emacs/26.3/lisp/org/ox-org

/usr/share/emacs/site-lisp/org/ox-odt hides
/usr/share/emacs/26.3/lisp/org/ox-odt

/usr/share/emacs/site-lisp/org/ox-md hides /usr/share/emacs/26.3/lisp/org/ox-md

/usr/share/emacs/site-lisp/org/ox-man hides
/usr/share/emacs/26.3/lisp/org/ox-man

/usr/share/emacs/site-lisp/org/ox-latex hides
/usr/share/emacs/26.3/lisp/org/ox-latex

/usr/share/emacs/site-lisp/org/ox-icalendar hides
/usr/share/emacs/26.3/lisp/org/ox-icalendar

/usr/share/emacs/site-lisp/org/ox-html hides
/usr/share/emacs/26.3/lisp/org/ox-html

/usr/share/emacs/site-lisp/org/ox-beamer hides
/usr/share/emacs/26.3/lisp/org/ox-beamer

/usr/share/emacs/site-lisp/org/ox-ascii hides
/usr/share/emacs/26.3/lisp/org/ox-ascii

/usr/share/emacs/site-lisp/org/org hides /usr/share/emacs/26.3/lisp/org/org

/usr/share/emacs/site-lisp/org/org-version hides
/usr/share/emacs/26.3/lisp/org/org-version

/usr/share/emacs/site-lisp/org/org-timer hides
/usr/share/emacs/26.3/lisp/org/org-timer

/usr/share/emacs/site-lisp/org/org-table hides
/usr/share/emacs/26.3/lisp/org/org-table

/usr/share/emacs/site-lisp/org/org-src hides
/usr/share/emacs/26.3/lisp/org/org-src

/usr/share/emacs/site-lisp/org/org-protocol hides
/usr/share/emacs/26.3/lisp/org/org-protocol

/usr/share/emacs/site-lisp/org/org-plot hides
/usr/share/emacs/26.3/lisp/org/org-plot

/usr/share/emacs/site-lisp/org/org-pcomplete hides
/usr/share/emacs/26.3/lisp/org/org-pcomplete

/usr/share/emacs/site-lisp/org/org-mouse hides
/usr/share/emacs/26.3/lisp/org/org-mouse

/usr/share/emacs/site-lisp/org/org-mobile hides
/usr/share/emacs/26.3/lisp/org/org-mobile

/usr/share/emacs/site-lisp/org/org-macs hides
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/usr/share/emacs/site-lisp/org/org-macro hides
/usr/share/emacs/26.3/lisp/org/org-macro

/usr/share/emacs/site-lisp/org/org-loaddefs hides
/usr/share/emacs/26.3/lisp/org/org-loaddefs

/usr/share/emacs/site-lisp/org/org-list hides
/usr/share/emacs/26.3/lisp/org/org-list

/usr/share/emacs/site-lisp/org/org-lint hides
/usr/share/emacs/26.3/lisp/org/org-lint

/usr/share/emacs/site-lisp/org/org-install hides
/usr/share/emacs/26.3/lisp/org/org-install

/usr/share/emacs/site-lisp/org/org-inlinetask hides
/usr/share/emacs/26.3/lisp/org/org-inlinetask

/usr/share/emacs/site-lisp/org/org-indent hides
/usr/share/emacs/26.3/lisp/org/org-indent

/usr/share/emacs/site-lisp/org/org-id hides
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/usr/share/emacs/site-lisp/org/org-habit hides
/usr/share/emacs/26.3/lisp/org/org-habit

/usr/share/emacs/site-lisp/org/org-footnote hides
/usr/share/emacs/26.3/lisp/org/org-footnote

/usr/share/emacs/site-lisp/org/org-feed hides
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/usr/share/emacs/site-lisp/org/org-faces hides
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/usr/share/emacs/site-lisp/org/org-entities hides
/usr/share/emacs/26.3/lisp/org/org-entities

/usr/share/emacs/site-lisp/org/org-element hides
/usr/share/emacs/26.3/lisp/org/org-element

/usr/share/emacs/site-lisp/org/org-duration hides
/usr/share/emacs/26.3/lisp/org/org-duration

/usr/share/emacs/site-lisp/org/org-datetree hides
/usr/share/emacs/26.3/lisp/org/org-datetree

/usr/share/emacs/site-lisp/org/org-ctags hides
/usr/share/emacs/26.3/lisp/org/org-ctags

/usr/share/emacs/site-lisp/org/org-crypt hides
/usr/share/emacs/26.3/lisp/org/org-crypt

/usr/share/emacs/site-lisp/org/org-compat hides
/usr/share/emacs/26.3/lisp/org/org-compat

/usr/share/emacs/site-lisp/org/org-colview hides
/usr/share/emacs/26.3/lisp/org/org-colview

/usr/share/emacs/site-lisp/org/org-clock hides
/usr/share/emacs/26.3/lisp/org/org-clock

/usr/share/emacs/site-lisp/org/org-capture hides
/usr/share/emacs/26.3/lisp/org/org-capture

/usr/share/emacs/site-lisp/org/org-attach hides
/usr/share/emacs/26.3/lisp/org/org-attach

/usr/share/emacs/site-lisp/org/org-archive hides
/usr/share/emacs/26.3/lisp/org/org-archive

/usr/share/emacs/site-lisp/org/org-agenda hides
/usr/share/emacs/26.3/lisp/org/org-agenda

/usr/share/emacs/site-lisp/org/ob hides /usr/share/emacs/26.3/lisp/org/ob

/usr/share/emacs/site-lisp/org/ob-vala hides
/usr/share/emacs/26.3/lisp/org/ob-vala

/usr/share/emacs/site-lisp/org/ob-tangle hides
/usr/share/emacs/26.3/lisp/org/ob-tangle

/usr/share/emacs/site-lisp/org/ob-table hides
/usr/share/emacs/26.3/lisp/org/ob-table

/usr/share/emacs/site-lisp/org/ob-stan hides
/usr/share/emacs/26.3/lisp/org/ob-stan

/usr/share/emacs/site-lisp/org/ob-sqlite hides
/usr/share/emacs/26.3/lisp/org/ob-sqlite

/usr/share/emacs/site-lisp/org/ob-sql hides
/usr/share/emacs/26.3/lisp/org/ob-sql

/usr/share/emacs/site-lisp/org/ob-shen hides
/usr/share/emacs/26.3/lisp/org/ob-shen

/usr/share/emacs/site-lisp/org/ob-shell hides
/usr/share/emacs/26.3/lisp/org/ob-shell

/usr/share/emacs/site-lisp/org/ob-sed hides
/usr/share/emacs/26.3/lisp/org/ob-sed

/usr/share/emacs/site-lisp/org/ob-screen hides
/usr/share/emacs/26.3/lisp/org/ob-screen

/usr/share/emacs/site-lisp/org/ob-scheme hides
/usr/share/emacs/26.3/lisp/org/ob-scheme

/usr/share/emacs/site-lisp/org/ob-sass hides
/usr/share/emacs/26.3/lisp/org/ob-sass

/usr/share/emacs/site-lisp/org/ob-ruby hides
/usr/share/emacs/26.3/lisp/org/ob-ruby

/usr/share/emacs/site-lisp/org/ob-ref hides
/usr/share/emacs/26.3/lisp/org/ob-ref

/usr/share/emacs/site-lisp/org/ob-python hides
/usr/share/emacs/26.3/lisp/org/ob-python

/usr/share/emacs/site-lisp/org/ob-processing hides
/usr/share/emacs/26.3/lisp/org/ob-processing

/usr/share/emacs/site-lisp/org/ob-plantuml hides
/usr/share/emacs/26.3/lisp/org/ob-plantuml

/usr/share/emacs/site-lisp/org/ob-picolisp hides
/usr/share/emacs/26.3/lisp/org/ob-picolisp

/usr/share/emacs/site-lisp/org/ob-perl hides
/usr/share/emacs/26.3/lisp/org/ob-perl

/usr/share/emacs/site-lisp/org/ob-org hides
/usr/share/emacs/26.3/lisp/org/ob-org

/usr/share/emacs/site-lisp/org/ob-octave hides
/usr/share/emacs/26.3/lisp/org/ob-octave

/usr/share/emacs/site-lisp/org/ob-ocaml hides
/usr/share/emacs/26.3/lisp/org/ob-ocaml

/usr/share/emacs/site-lisp/org/ob-mscgen hides
/usr/share/emacs/26.3/lisp/org/ob-mscgen

/usr/share/emacs/site-lisp/org/ob-maxima hides
/usr/share/emacs/26.3/lisp/org/ob-maxima

/usr/share/emacs/site-lisp/org/ob-matlab hides
/usr/share/emacs/26.3/lisp/org/ob-matlab

/usr/share/emacs/site-lisp/org/ob-makefile hides
/usr/share/emacs/26.3/lisp/org/ob-makefile

/usr/share/emacs/site-lisp/org/ob-lua hides
/usr/share/emacs/26.3/lisp/org/ob-lua

/usr/share/emacs/site-lisp/org/ob-lob hides
/usr/share/emacs/26.3/lisp/org/ob-lob

/usr/share/emacs/site-lisp/org/ob-lisp hides
/usr/share/emacs/26.3/lisp/org/ob-lisp

/usr/share/emacs/site-lisp/org/ob-lilypond hides
/usr/share/emacs/26.3/lisp/org/ob-lilypond

/usr/share/emacs/site-lisp/org/ob-ledger hides
/usr/share/emacs/26.3/lisp/org/ob-ledger

/usr/share/emacs/site-lisp/org/ob-latex hides
/usr/share/emacs/26.3/lisp/org/ob-latex

/usr/share/emacs/site-lisp/org/ob-js hides /usr/share/emacs/26.3/lisp/org/ob-js

/usr/share/emacs/site-lisp/org/ob-java hides
/usr/share/emacs/26.3/lisp/org/ob-java

/usr/share/emacs/site-lisp/org/ob-io hides /usr/share/emacs/26.3/lisp/org/ob-io

/usr/share/emacs/site-lisp/org/ob-hledger hides
/usr/share/emacs/26.3/lisp/org/ob-hledger

/usr/share/emacs/site-lisp/org/ob-haskell hides
/usr/share/emacs/26.3/lisp/org/ob-haskell

/usr/share/emacs/site-lisp/org/ob-groovy hides
/usr/share/emacs/26.3/lisp/org/ob-groovy

/usr/share/emacs/site-lisp/org/ob-gnuplot hides
/usr/share/emacs/26.3/lisp/org/ob-gnuplot

/usr/share/emacs/site-lisp/org/ob-fortran hides
/usr/share/emacs/26.3/lisp/org/ob-fortran

/usr/share/emacs/site-lisp/org/ob-forth hides
/usr/share/emacs/26.3/lisp/org/ob-forth

/usr/share/emacs/site-lisp/org/ob-exp hides
/usr/share/emacs/26.3/lisp/org/ob-exp

/usr/share/emacs/site-lisp/org/ob-eval hides
/usr/share/emacs/26.3/lisp/org/ob-eval

/usr/share/emacs/site-lisp/org/ob-emacs-lisp hides
/usr/share/emacs/26.3/lisp/org/ob-emacs-lisp

/usr/share/emacs/site-lisp/org/ob-ebnf hides
/usr/share/emacs/26.3/lisp/org/ob-ebnf

/usr/share/emacs/site-lisp/org/ob-dot hides
/usr/share/emacs/26.3/lisp/org/ob-dot

/usr/share/emacs/site-lisp/org/ob-ditaa hides
/usr/share/emacs/26.3/lisp/org/ob-ditaa

/usr/share/emacs/site-lisp/org/ob-css hides
/usr/share/emacs/26.3/lisp/org/ob-css

/usr/share/emacs/site-lisp/org/ob-core hides
/usr/share/emacs/26.3/lisp/org/ob-core

/usr/share/emacs/site-lisp/org/ob-coq hides
/usr/share/emacs/26.3/lisp/org/ob-coq

/usr/share/emacs/site-lisp/org/ob-comint hides
/usr/share/emacs/26.3/lisp/org/ob-comint

/usr/share/emacs/site-lisp/org/ob-clojure hides
/usr/share/emacs/26.3/lisp/org/ob-clojure

/usr/share/emacs/site-lisp/org/ob-calc hides
/usr/share/emacs/26.3/lisp/org/ob-calc

/usr/share/emacs/site-lisp/org/ob-awk hides
/usr/share/emacs/26.3/lisp/org/ob-awk

/usr/share/emacs/site-lisp/org/ob-asymptote hides
/usr/share/emacs/26.3/lisp/org/ob-asymptote

/usr/share/emacs/site-lisp/org/ob-abc hides
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/usr/share/emacs/site-lisp/org/ob-R hides /usr/share/emacs/26.3/lisp/org/ob-R

/usr/share/emacs/site-lisp/org/ob-J hides /usr/share/emacs/26.3/lisp/org/ob-J

/usr/share/emacs/site-lisp/org/ob-C hides /usr/share/emacs/26.3/lisp/org/ob-C


Features:

(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv

bytecomp byte-compile cconv cl-loaddefs cl-lib dired dired-loaddefs

format-spec rfc822 mml easymenu mml-sec password-cache epa derived epg

epg-config gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode

mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047

rfc2045 ietf-drums mm-util mail-prsvr mail-utils term/xterm xterm

time-date elec-pair mule-util china-util tooltip eldoc electric uniquify

ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win

term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe

tabulated-list replace newcomment text-mode elisp-mode lisp-mode

prog-mode register page menu-bar rfn-eshadow isearch timer select

scroll-bar mouse jit-lock font-lock syntax facemenu font-core

term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang

vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932

hebrew greek romanian slovak czech european ethiopic indian cyrillic

chinese composite charscript charprop case-table epa-hook jka-cmpr-hook

help simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs

button faces cus-face macroexp files text-properties overlay sha1 md5

base64 format env code-pages mule custom widget hashtable-print-readable

backquote threads dbusbind inotify lcms2 dynamic-setting

system-font-setting font-render-setting move-toolbar gtk x-toolkit x

multi-tty make-network-process emacs)


Memory information:

((conses 16 100499 7255)

(symbols 48 20515 1)

(miscs 40 76 80)

(strings 32 28738 1115)

(string-bytes 1 750466)

(vectors 16 13058)

(vector-slots 8 514211 18624)

(floats 8 54 337)

(intervals 56 232 0)

(buffers 992 13))
This bug report was last modified 4 years and 288 days ago.

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