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runtime: fix nil reference in cleanup rootless user

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It seems the client (crio) can send multiple requests to stop the Kata VM,
resulting a nil reference if the uid has already been cleaned up by a different thread.

Fixes #2743

Signed-off-by: Feng Wang <feng.wang@databricks.com>
This commit is contained in:
Feng Wang 2021-09-27 21:28:47 -07:00
parent 3217b03b17
commit e5fe53f0a9
1 changed files with 2 additions and 0 deletions
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2
src/runtime/virtcontainers/qemu.go
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@ -1024,10 +1024,12 @@ func (q *qemu) cleanupVM() error {
u, err := user.LookupId(strconv.Itoa(int(q.config.Uid)))
if err != nil {
q.Logger().WithError(err).WithField("uid", q.config.Uid).Warn("failed to find the user")
return nil
}
userdelPath, err := pkgUtils.FirstValidExecutable([]string{"/usr/sbin/userdel", "/sbin/userdel", "/bin/userdel"})
if err != nil {
q.Logger().WithError(err).WithField("user", u.Username).Warn("failed to delete the user")
return nil
}
_, err = pkgUtils.RunCommand([]string{userdelPath, "-f", u.Username})
if err != nil {