fuzz: add fuzz test for parsing definite descriptor keys

Author: apoelstra

.github/workflows/cron-daily-fuzz.yml

@@ -22,6 +22,7 @@ compile_descriptor,
 compile_taproot,
 miniscript_satisfy,
 parse_descriptor,
+parse_descriptor_definite,
 parse_descriptor_priv,
 parse_descriptor_secret,
 regression_descriptor_parse,

fuzz/Cargo.toml

@@ -34,6 +34,10 @@ path = "fuzz_targets/miniscript_satisfy.rs"
 name = "parse_descriptor"
 path = "fuzz_targets/parse_descriptor.rs"
 
+[[bin]]
+name = "parse_descriptor_definite"
+path = "fuzz_targets/parse_descriptor_definite.rs"
+
 [[bin]]
 name = "parse_descriptor_priv"
 path = "fuzz_targets/parse_descriptor_priv.rs"

fuzz/fuzz_targets/parse_descriptor_definite.rs

@@ -0,0 +1,21 @@
+#![allow(unexpected_cfgs)]
+
+use honggfuzz::fuzz;
+use miniscript::{DefiniteDescriptorKey, Descriptor};
+
+fn do_test(data: &[u8]) {
+    let data_str = String::from_utf8_lossy(data);
+
+    if let Ok(desc) = data_str.parse::<Descriptor<DefiniteDescriptorKey>>() {
+        let _ = desc.to_string();
+        let _ = desc.address(miniscript::bitcoin::Network::Bitcoin);
+    }
+}
+
+fn main() {
+    loop {
+        fuzz!(|data| {
+            do_test(data);
+        });
+    }
+}