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From 5fe7795d5fa5061f0ba615472f9351f9d29abf48 Mon Sep 17 00:00:00 2001
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Message-Id: <5fe7795d5fa5061f0ba615472f9351f9d29abf48@dist-git>
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From: =?UTF-8?q?J=C3=A1n=20Tomko?= <jtomko@redhat.com>
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Date: Fri, 2 Oct 2020 13:44:44 +0200
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Subject: [PATCH] check for NULL before calling g_regex_unref
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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g_regex_unref reports an error if called with a NULL argument.
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We have two cases in the code where we (possibly) call it on a NULL
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argument. The interesting one is in virDomainQemuMonitorEventCleanup.
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Based on VIR_CONNECT_DOMAIN_QEMU_MONITOR_EVENT_REGISTER_REGEX, we unref
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data->regex, which has two problems:
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* On the client side, flags is -1 so the comparison is true even if no
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regex was used, reproducible by:
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$ virsh qemu-monitor-event --timeout 1
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which results in an ugly error:
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(process:1289846): GLib-CRITICAL **: 14:58:42.631: g_regex_unref: assertion 'regex != NULL' failed
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* On the server side, we only create the regex if both the flag and the
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string are present, so it's possible to trigger this message by:
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$ virsh qemu-monitor-event --regex --timeout 1
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Use a non-NULL comparison instead of the flag to decide whether we need
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to unref the regex. And add a non-NULL check to the unref in the
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VirtualBox test too.
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Signed-off-by: Ján Tomko <jtomko@redhat.com>
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Fixes: 71efb59a4de7c51b1bc889a316f1796ebf55738f
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https://bugzilla.redhat.com/show_bug.cgi?id=1876907
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Reviewed-by: Peter Krempa <pkrempa@redhat.com>
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Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
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(cherry picked from commit 92b252456ee6d6ffc6e39e62ce1ce6c50113e00e)
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https://bugzilla.redhat.com/show_bug.cgi?id=1861176
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Signed-off-by: Ján Tomko <jtomko@redhat.com>
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Message-Id: <7d3c84f6556d0d46ada037d5e56c831babba609f.1601639064.git.jtomko@redhat.com>
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Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
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---
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src/conf/domain_event.c | 2 +-
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tests/vboxsnapshotxmltest.c | 3 ++-
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2 files changed, 3 insertions(+), 2 deletions(-)
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diff --git a/src/conf/domain_event.c b/src/conf/domain_event.c
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index 33fbf10406..d3acde0236 100644
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--- a/src/conf/domain_event.c
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+++ b/src/conf/domain_event.c
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@@ -2194,7 +2194,7 @@ virDomainQemuMonitorEventCleanup(void *opaque)
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virDomainQemuMonitorEventData *data = opaque;
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VIR_FREE(data->event);
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- if (data->flags & VIR_CONNECT_DOMAIN_QEMU_MONITOR_EVENT_REGISTER_REGEX)
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+ if (data->regex)
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g_regex_unref(data->regex);
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if (data->freecb)
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(data->freecb)(data->opaque);
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diff --git a/tests/vboxsnapshotxmltest.c b/tests/vboxsnapshotxmltest.c
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index d1a7522931..8577157020 100644
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--- a/tests/vboxsnapshotxmltest.c
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+++ b/tests/vboxsnapshotxmltest.c
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@@ -134,7 +134,8 @@ mymain(void)
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DO_TEST("2disks-3snap-brother");
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cleanup:
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- g_regex_unref(testSnapshotXMLVariableLineRegex);
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+ if (testSnapshotXMLVariableLineRegex)
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+ g_regex_unref(testSnapshotXMLVariableLineRegex);
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return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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--
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2.28.0
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