From 28d6df0db6df0dc083eaea6b29b8fe1773eef5ff Mon Sep 17 00:00:00 2001
From: Nick Fitzgerald <fitzgen@gmail.com>
Date: Mon, 18 May 2020 19:27:00 -0700
Subject: [PATCH] Limit the size of automaton keys in the `peepmatic_fst_diff`
 fuzz target (#1724)

This should avoid timeouts caused by large keys.

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22251
---
 cranelift/peepmatic/crates/fuzzing/src/automata.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/cranelift/peepmatic/crates/fuzzing/src/automata.rs b/cranelift/peepmatic/crates/fuzzing/src/automata.rs
index c399da037f..b4f88c44bb 100644
--- a/cranelift/peepmatic/crates/fuzzing/src/automata.rs
+++ b/cranelift/peepmatic/crates/fuzzing/src/automata.rs
@@ -109,7 +109,11 @@ pub fn simple_automata(input_output_pairs: Vec<Vec<(u8, Vec<u8>)>>) {
 pub fn fst_differential(map: HashMap<Vec<u8>, u64>) {
     let _ = env_logger::try_init();
 
-    let mut inputs: Vec<_> = map.keys().filter(|i| !i.is_empty()).cloned().collect();
+    let mut inputs: Vec<_> = map
+        .keys()
+        .filter(|k| !k.is_empty() && k.len() < 256)
+        .cloned()
+        .collect();
     inputs.sort();
     inputs.dedup();
     if inputs.is_empty() {