Fix: reject non-revision names in ExtractRevision (#7210)

ExtractRevision parsed the last hyphen segment as the revision number
without validating the name shape, so a bareword like "5" returned
5,nil and any name lacking a trailing v-prefixed segment silently
mis-parsed instead of erroring. Mirror the existing ExtractRevisionNum
guards: error with ErrBadRevision when there is no delimiter or the
last segment is not v-prefixed. Extend the colocated bad-name test
cases accordingly.

Signed-off-by: Anas Khan <83116240+anxkhn@users.noreply.github.com>

pkg/controller/utils/utils.go

@@ -17,6 +17,7 @@ limitations under the License.
 package utils
 
 import (
+	"errors"
 	"fmt"
 	"strconv"
 	"strings"
@@ -53,6 +54,14 @@ var ExtractComponentName = util.ExtractComponentName
 // ExtractRevision will extract the revision from a revisionName
 func ExtractRevision(revisionName string) (int, error) {
 	splits := strings.Split(revisionName, "-")
+	// check some bad revision name, eg: 5
+	if len(splits) == 1 {
+		return 0, errors.New(util.ErrBadRevision)
+	}
+	// check some bad revision name, eg: myapp-a1
+	if !strings.HasPrefix(splits[len(splits)-1], "v") {
+		return 0, errors.New(util.ErrBadRevision)
+	}
 	// the revision is the last string without the prefix "v"
 	return strconv.Atoi(strings.TrimPrefix(splits[len(splits)-1], "v"))
 }

pkg/controller/utils/utils_test.go

@@ -42,7 +42,7 @@ func TestConstructExtract(t *testing.T) {
 			}
 		})
 	}
-	badRevision := []string{"xx", "yy-", "zz-0.1"}
+	badRevision := []string{"xx", "yy-", "zz-0.1", "5", "myapp-a1"}
 	t.Run(fmt.Sprintf("tests %s for extractRevision", badRevision), func(t *testing.T) {
 		for _, revisionName := range badRevision {
 			_, err := ExtractRevision(revisionName)