plumbing: protocol/packp, Add validation for decodeLine

Signed-off-by: Paulo Gomes <pjbgf@linux.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/plumbing/protocol/packp/srvresp.go b/plumbing/protocol/packp/srvresp.go
index 8cd0a72..a9ddb53 100644
--- a/plumbing/protocol/packp/srvresp.go
+++ b/plumbing/protocol/packp/srvresp.go
@@ -101,12 +101,14 @@ func (r *ServerResponse) decodeLine(line []byte) error {
 		return fmt.Errorf("unexpected flush")
 	}
 
-	if bytes.Equal(line[0:3], ack) {
-		return r.decodeACKLine(line)
-	}
+	if len(line) >= 3 {
+		if bytes.Equal(line[0:3], ack) {
+			return r.decodeACKLine(line)
+		}
 
-	if bytes.Equal(line[0:3], nak) {
-		return nil
+		if bytes.Equal(line[0:3], nak) {
+			return nil
+		}
 	}
 
 	return fmt.Errorf("unexpected content %q", string(line))