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clh: Don't crash if no network device is set by the upper layer

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`ctr` doesn't set a network device when creating the sandbox, which
leads to Cloud Hypervisor's driver crashing, see the log below:
```
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0x55641c23b248]
goroutine 32 [running]:
github.com/kata-containers/kata-containers/src/runtime/virtcontainers.glob..func1(0xc000397900)
	/home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/virtcontainers/clh.go:163 +0x128
github.com/kata-containers/kata-containers/src/runtime/virtcontainers.(*cloudHypervisor).vmAddNetPut(...)
	/home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/virtcontainers/clh.go:1348
github.com/kata-containers/kata-containers/src/runtime/virtcontainers.(*cloudHypervisor).bootVM(0xc000397900, {0x55641c76dfc0, 0xc000454ae0})
	/home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/virtcontainers/clh.go:1378 +0x5a2
github.com/kata-containers/kata-containers/src/runtime/virtcontainers.(*cloudHypervisor).StartVM(0xc000397900, {0x55641c76dff8, 0xc00044c240},
0x55641b8016fd)
        /home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/virtcontainers/clh.go:659 +0x7ee
github.com/kata-containers/kata-containers/src/runtime/virtcontainers.(*Sandbox).startVM.func2()
        /home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/virtcontainers/sandbox.go:1219 +0x190
github.com/kata-containers/kata-containers/src/runtime/virtcontainers.(*LinuxNetwork).Run.func1({0xc0004a8910, 0x3b})
        /home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/virtcontainers/network_linux.go:319 +0x1b
github.com/kata-containers/kata-containers/src/runtime/virtcontainers.doNetNS({0xc000048440, 0xc00044c240}, 0xc0005d5b38)
        /home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/virtcontainers/network_linux.go:1045 +0x163
github.com/kata-containers/kata-containers/src/runtime/virtcontainers.(*LinuxNetwork).Run(0xc000150c80, {0x55641c76dff8, 0xc00044c240}, 0xc00014e4e0)
	/home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/virtcontainers/network_linux.go:318 +0x105
github.com/kata-containers/kata-containers/src/runtime/virtcontainers.(*Sandbox).startVM(0xc000107d40, {0x55641c76dff8, 0xc0005529f0})
	/home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/virtcontainers/sandbox.go:1205 +0x65f
github.com/kata-containers/kata-containers/src/runtime/virtcontainers.createSandboxFromConfig({_, _}, {{0x0, 0x0, 0x0}, {0xc000385a00, 0x1, 0x1},
{0x55641d033260, 0x0, ...}, ...}, ...)
        /home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/virtcontainers/api.go:91 +0x346
github.com/kata-containers/kata-containers/src/runtime/virtcontainers.CreateSandbox({_, _}, {{0x0, 0x0, 0x0}, {0xc000385a00, 0x1, 0x1},
{0x55641d033260, 0x0, ...}, ...}, ...)
        /home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/virtcontainers/api.go:51 +0x150
github.com/kata-containers/kata-containers/src/runtime/virtcontainers.(*VCImpl).CreateSandbox(_, {_, _}, {{0x0, 0x0, 0x0}, {0xc000385a00, 0x1, 0x1},
{0x55641d033260, ...}, ...})
        /home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/virtcontainers/implementation.go:35 +0x74
github.com/kata-containers/kata-containers/src/runtime/pkg/katautils.CreateSandbox({_, _}, {_, _}, {{0xc0004806c0, 0x9}, 0xc000140110, 0xc00000f7a0,
{0x0, 0x0}, ...}, ...)
        /home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/pkg/katautils/create.go:175 +0x8b6
github.com/kata-containers/kata-containers/src/runtime/pkg/containerd-shim-v2.create({0x55641c76dff8, 0xc0004129f0}, 0xc00034a000, 0xc00036a000)
        /home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/pkg/containerd-shim-v2/create.go:147 +0xdea
github.com/kata-containers/kata-containers/src/runtime/pkg/containerd-shim-v2.(*service).Create.func2()
        /home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/pkg/containerd-shim-v2/service.go:401 +0x32
created by github.com/kata-containers/kata-containers/src/runtime/pkg/containerd-shim-v2.(*service).Create
        /home/ubuntu/go/src/github.com/kata-containers/kata-containers/src/runtime/pkg/containerd-shim-v2/service.go:400 +0x534
```

This bug has been introduced as part of the
https://github.com/kata-containers/kata-containers/pull/4312 PR, which
changed how we add the network device.

In order to avoid the crash, let's simply check whether we have a device
to be added before iterating the list of network devices.

Fixes: #4618

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>
(cherry picked from commit be31207f6e)
This commit is contained in:
Fabiano Fidêncio 2022-07-13 10:31:37 +02:00
parent 0e8e10540b
commit da24fd88e2
1 changed files with 5 additions and 0 deletions
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5
src/runtime/virtcontainers/clh.go
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@ -149,6 +149,11 @@ func (c *clhClientApi) VmRemoveDevicePut(ctx context.Context, vmRemoveDevice chc
// This is done in order to be able to override such a function as part of
// our unit tests, as when testing bootVM we're on a mocked scenario already.
var vmAddNetPutRequest = func(clh *cloudHypervisor) error {
if clh.netDevices == nil {
clh.Logger().Info("No network device has been configured by the upper layer")
return nil
}
addr, err := net.ResolveUnixAddr("unix", clh.state.apiSocket)
if err != nil {
return err