public inbox for gdb-cvs@sourceware.org
help / color / mirror / Atom feed
* [binutils-gdb] fix leak in gdb_environ
@ 2022-11-27 20:08 Philippe Waroquiers
0 siblings, 0 replies; only message in thread
From: Philippe Waroquiers @ 2022-11-27 20:08 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=c801f8f138c03cde994db597d11953c21ed892de
commit c801f8f138c03cde994db597d11953c21ed892de
Author: Philippe Waroquiers <philippe.waroquiers@skynet.be>
Date: Sun Nov 27 19:20:58 2022 +0100
fix leak in gdb_environ
valgrind reports a leak when assigning a gdb_environ to another gdb_environ.
The memory allocated for the target gdb_environ env variables is not released.
The gdb_environ selftest reproduces the leak (see below).
Fix the leak by clearing the target gdb_environ before std::move-ing the
members.
Tested natively and re-running all tests under valgrind.
==3261873== 4,842 bytes in 69 blocks are definitely lost in loss record 6,772 of 6,839
==3261873== at 0x483979B: malloc (vg_replace_malloc.c:393)
==3261873== by 0x25A454: xmalloc (alloc.c:57)
==3261873== by 0x7D1E4E: xstrdup (xstrdup.c:34)
==3261873== by 0x7E2A51: gdb_environ::from_host_environ() (environ.cc:56)
==3261873== by 0x66F1C8: test_reinit_from_host_environ (environ-selftests.c:78)
==3261873== by 0x66F1C8: selftests::gdb_environ_tests::run_tests() (environ-selftests.c:285)
==3261873== by 0x7EFC43: operator() (std_function.h:622)
=
Approved-By: Simon Marchi <simon.marchi@efficios.com>
Diff:
---
gdbsupport/environ.cc | 2 ++
1 file changed, 2 insertions(+)
diff --git a/gdbsupport/environ.cc b/gdbsupport/environ.cc
index f5f6b38e19c..2d8e3ea6e92 100644
--- a/gdbsupport/environ.cc
+++ b/gdbsupport/environ.cc
@@ -29,6 +29,8 @@ gdb_environ::operator= (gdb_environ &&e)
if (&e == this)
return *this;
+ this->clear ();
+
m_environ_vector = std::move (e.m_environ_vector);
m_user_set_env = std::move (e.m_user_set_env);
m_user_unset_env = std::move (e.m_user_unset_env);
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2022-11-27 20:08 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-11-27 20:08 [binutils-gdb] fix leak in gdb_environ Philippe Waroquiers
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).