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vc: BlockIndex should not be altered in case of error

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BlockIndex should not increment in case of error.

Similar issue applies to decrementSandboxBlockIndex where the symptom may be more severe - in worst case, the block index may become negative.

Fixes #2244

Signed-off-by: Ted Yu <yuzhihong@gmail.com>
This commit is contained in:
Ted Yu 2019-11-21 15:34:33 -08:00
parent a17ca14c7a
commit c833ac2c53
1 changed files with 14 additions and 1 deletions
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15
virtcontainers/sandbox.go
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@ -1686,6 +1686,12 @@ func (s *Sandbox) resumeSetStates() error {
// block device is assigned to a container in the sandbox.
func (s *Sandbox) getAndSetSandboxBlockIndex() (int, error) {
currentIndex := s.state.BlockIndex
var err error
defer func() {
if err != nil {
s.state.BlockIndex = currentIndex
}
}()
// Increment so that container gets incremented block index
s.state.BlockIndex++
@ -1704,12 +1710,19 @@ func (s *Sandbox) getAndSetSandboxBlockIndex() (int, error) {
// decrementSandboxBlockIndex decrements the current sandbox block index.
// This is used to recover from failure while adding a block device.
func (s *Sandbox) decrementSandboxBlockIndex() error {
var err error
original := s.state.BlockIndex
s.state.BlockIndex--
defer func() {
if err != nil {
s.state.BlockIndex = original
}
}()
if !s.supportNewStore() {
// experimental runtime use "persist.json" which doesn't need "state.json" anymore
// update on-disk state
if err := s.store.Store(store.State, s.state); err != nil {
if err = s.store.Store(store.State, s.state); err != nil {
return err
}
}