Merge pull request #28098 from yongtang/25099-oom_score_adj-empty-env

Fix `/proc/<pid>/oom_score_adj: invalid argument` error caused by empty env name
Upstream-commit: c025049c27c2cc8a6f1f978769c89a1fdf07a6f3
Component: engine

components/engine/daemon/container.go

@@ -15,6 +15,7 @@ import (
 	"github.com/docker/docker/pkg/signal"
 	"github.com/docker/docker/pkg/system"
 	"github.com/docker/docker/pkg/truncindex"
+	"github.com/docker/docker/runconfig/opts"
 	"github.com/docker/go-connections/nat"
 )
 
@@ -232,6 +233,13 @@ func (daemon *Daemon) verifyContainerSettings(hostConfig *containertypes.HostCon
 				return nil, fmt.Errorf("invalid hostname format: %s", config.Hostname)
 			}
 		}
+
+		// Validate if Env contains empty variable or not (e.g., ``, `=foo`)
+		for _, env := range config.Env {
+			if _, err := opts.ValidateEnv(env); err != nil {
+				return nil, err
+			}
+		}
 	}
 
 	if hostConfig == nil {