From a9da0092198ba2f278cea370f8251f2e29f57c7d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A1n=20Tomko?= <jtomko@redhat.com>
Date: Tue, 5 Mar 2024 14:55:26 +0100
Subject: [PATCH] qemu: virtiofs: do not crash if cgroups are missing
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On domain startup, qemuSetupCgroupForExtDevices checks
if a cgroup controller is present and skips the setup if not.

Add a similar check to qemuVirtioFSSetupCgroup to prevent
crashing when hotplugging a virtiofs filesystem.

Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
---
 src/qemu/qemu_virtiofs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/qemu/qemu_virtiofs.c b/src/qemu/qemu_virtiofs.c
index d539d0a192..15dea3bb57 100644
--- a/src/qemu/qemu_virtiofs.c
+++ b/src/qemu/qemu_virtiofs.c
@@ -353,6 +353,9 @@ qemuVirtioFSSetupCgroup(virDomainObj *vm,
     pid_t pid = -1;
     int rc;
 
+    if (!cgroup)
+        return 0;
+
     if (!(pidfile = qemuVirtioFSCreatePidFilename(vm, fs->info.alias)))
         return -1;