GNU bug report logs - #78762
[PATCH] Fix segfault in profiler-cpu-log and profiler-memory-log

Previous Next

Full log

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Zach Shaftel <zach <at> shaf.tel>
To: bug-gnu-emacs <at> gnu.org
Subject: [PATCH] Fix segfault in profiler-cpu-log and profiler-memory-log
Date: Wed, 11 Jun 2025 16:03:12 -0400

[Message part 1 (text/plain, inline)]

Tags: patch

a simple NULL dereference fix. the profiler log would be null if
profiler-*-log is called without a profiler-*-start before it, or if a
previous profiler-*-log call had flushed the log and the profiler wasn't
restarted since then. then export_log would try to read the NULL log and
segfault.

to reproduce the bug:
emacs --batch -f profiler-cpu-log

this patch causes profiler-cpu-log and profiler-memory-log to just
return nil if the log is null.


In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.49, cairo version 1.18.4) of 2025-06-04 built on bigbox
Repository revision: 680fa61b5989b84c0e19ac568be012afd8345f0c
Repository branch: master
System Description: Arch Linux

Configured using:
 'configure --with-modules --without-xwidgets --with-native-compilation
 --with-tree-sitter --without-gsettings --without-gconf --without-gpm
 --with-pgtk --without-compress-install 'CFLAGS=-mtune=native
 -march=native -O2 -g -fuse-ld=mold''

[0001-Fix-segfault-in-profiler-cpu-log-and-profiler-memory.patch (text/patch, attachment)]

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.