fuzz: don't panic when the proxy closes the conn

linkerd/addr/fuzz/Cargo.lock

@@ -0,0 +1,304 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
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+ "arbitrary",
+ "cc",
+]
+
+[[package]]
+name = "linkerd-addr"
+version = "0.1.0"
+dependencies = [
+ "http",
+ "linkerd-dns-name",
+ "thiserror",
+]
+
+[[package]]
+name = "linkerd-addr-fuzz"
+version = "0.0.0"
+dependencies = [
+ "libfuzzer-sys",
+ "linkerd-addr",
+]
+
+[[package]]
+name = "linkerd-dns-name"
+version = "0.1.0"
+dependencies = [
+ "thiserror",
+ "untrusted",
+ "webpki",
+]
+
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+ "cc",
+ "libc",
+ "once_cell",
+ "spin",
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+ "web-sys",
+ "winapi",
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+ "syn",
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+ "wasm-bindgen-macro",
+]
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+ "bumpalo",
+ "lazy_static",
+ "log",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
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+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
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+ "wasm-bindgen",
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+ "ring",
+ "untrusted",
+]
+
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+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
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linkerd/addr/fuzz/Cargo.toml

@@ -10,6 +10,8 @@ cargo-fuzz = true
 
 [dependencies]
 libfuzzer-sys = "0.4"
+tracing = "0.1.23"
+tracing-subscriber = "0.2.17"
 
 [dependencies.linkerd-addr]
 path = ".."

linkerd/addr/fuzz/fuzz_targets/fuzz_target_1.rs

@@ -1,9 +1,10 @@
 #![no_main]
 use libfuzzer_sys::fuzz_target;
 
-
 fuzz_target!(|data: &[u8]| {
+    let _ = tracing_subscriber::fmt::try_init();
     if let Ok(s) = std::str::from_utf8(data) {
+        tracing::info!(data = ?s, "running with input");
         linkerd_addr::fuzz_logic::fuzz_addr_1(s);
     }
 });

linkerd/app/inbound/fuzz/Cargo.toml

@@ -17,6 +17,8 @@ hyper = { version = "0.14.2", features = ["http1", "http2"] }
 http = "0.2"
 linkerd-app-core = { path = "../../core" }
 linkerd-app-test = { path = "../../test" }
+tracing = "0.1"
+tracing-subscriber = "0.2"
 
 [dependencies.linkerd-app-inbound]
 path = ".."

linkerd/app/inbound/fuzz/fuzz_targets/fuzz_target_1.rs

@@ -3,6 +3,8 @@ use libfuzzer_sys::fuzz_target;
 use linkerd_app_inbound::http::fuzz_logic::*;
 
 fuzz_target!(|requests: Vec<HttpRequestSpec>| {
+    let _ = tracing_subscriber::fmt::try_init();
+    tracing::info!(?requests, "running with input");
     if requests.len() == 0 {
         return;
     }