Merge #787: fuzz: add target for Descriptor::parse_descriptor

eb1e9f6 fuzz: add target for `Descriptor::parse_descriptor` (Bruno Garcia)

Pull request description:

ACKs for top commit:
  sanket1729:
    ACK eb1e9f6
  apoelstra:
    ACK eb1e9f6; successfully ran local tests; thanks!

Tree-SHA512: bec4da195b0f7370b81a62f1f2c92d84f862ca1ebfaee3f8fcc22d858fccdd15390f9839beaef7a6e6dac8b17484e534cce4581fb7b11f82df360e88c75ce0c3

fuzz/Cargo.toml

@@ -30,6 +30,10 @@ path = "fuzz_targets/compile_taproot.rs"
 name = "parse_descriptor"
 path = "fuzz_targets/parse_descriptor.rs"
 
+[[bin]]
+name = "parse_descriptor_priv"
+path = "fuzz_targets/parse_descriptor_priv.rs"
+
 [[bin]]
 name = "parse_descriptor_secret"
 path = "fuzz_targets/parse_descriptor_secret.rs"

fuzz/fuzz_targets/parse_descriptor_priv.rs

@@ -0,0 +1,23 @@
+#![allow(unexpected_cfgs)]
+
+use honggfuzz::fuzz;
+use miniscript::bitcoin::secp256k1;
+use miniscript::Descriptor;
+
+fn do_test(data: &[u8]) {
+    let data_str = String::from_utf8_lossy(data);
+    let secp = &secp256k1::Secp256k1::signing_only();
+
+    if let Ok((desc, _)) = Descriptor::parse_descriptor(secp, &data_str) {
+        let _output = desc.to_string();
+        let _sanity_check = desc.sanity_check();
+    }
+}
+
+fn main() {
+    loop {
+        fuzz!(|data| {
+            do_test(data);
+        });
+    }
+}