fuzz: fixing unsigned integer underflow (#12289)

Signed-off-by: Yifan Yang <needyyang@google.com>

Mirrored from https://github.com/envoyproxy/envoy @ 8f668e976ea0bbd7d3ac352247c1fdead6acbb31

envoy/config/tap/v3/common.proto

@@ -123,10 +123,10 @@ message HttpGenericBodyMatch {
       option (validate.required) = true;
 
       // Text string to be located in HTTP body.
-      string string_match = 1;
+      string string_match = 1 [(validate.rules).string = {min_len: 1}];
 
       // Sequence of bytes to be located in HTTP body.
-      bytes binary_match = 2;
+      bytes binary_match = 2 [(validate.rules).bytes = {min_len: 1}];
     }
   }
 

envoy/config/tap/v4alpha/common.proto

@@ -127,10 +127,10 @@ message HttpGenericBodyMatch {
       option (validate.required) = true;
 
       // Text string to be located in HTTP body.
-      string string_match = 1;
+      string string_match = 1 [(validate.rules).string = {min_len: 1}];
 
       // Sequence of bytes to be located in HTTP body.
-      bytes binary_match = 2;
+      bytes binary_match = 2 [(validate.rules).bytes = {min_len: 1}];
     }
   }