pytest: fix hsmtool which reports leak under address sanitizer.

Couldn't figure out why hsmtool.proc.wait(WAIT_TIMEOUT) returns 1?
hsmtool doesn't ever seem to exit status 1!

Signed-off-by: Rusty Russell <[email protected]>

Author: rustyrussell

tests/test_wallet.py

@@ -1338,7 +1338,12 @@ def test_hsmtool_generatehsm(node_factory):
               "cake have wedding\n".encode("utf-8"))
     hsmtool.wait_for_log(r"Enter your passphrase:")
     write_all(master_fd, "This is actually not a passphrase\n".encode("utf-8"))
-    assert hsmtool.proc.wait(WAIT_TIMEOUT) == 0
+    if hsmtool.proc.wait(WAIT_TIMEOUT) != 0:
+        hsmtool.logs_catchup()
+        print("hsmtool failure! Logs:")
+        for l in hsmtool.logs:
+            print('  ' + l)
+        assert False
     hsmtool.is_in_log(r"New hsm_secret file created")
 
     # Check should pass.

tools/hsmtool.c

@@ -530,7 +530,7 @@ static char *read_mnemonic(void) {
 
 static int generate_hsm(const char *hsm_secret_path,
 			const char *lang_id,
-			const char *mnemonic,
+			char *mnemonic,
 			char *passphrase)
 {
 	const char *err;
@@ -584,6 +584,7 @@ static int generate_hsm(const char *hsm_secret_path,
 	printf("New hsm_secret file created at %s\n", hsm_secret_path);
 	printf("Use the `encrypt` command to encrypt the BIP32 seed if needed\n");
 
+	free(mnemonic);
 	free(passphrase);
 	return 0;
 }
@@ -685,6 +686,7 @@ static int check_hsm(const char *hsm_secret_path)
 
 	printf("OK\n");
 
+	free(mnemonic);
 	free(passphrase);
 	return 0;
 }
@@ -810,8 +812,8 @@ int main(int argc, char *argv[])
 		if (lang_id && !check_lang(lang_id))
 			show_usage(argv[0]);
 
-		word_list = (argc > 4 ? argv[4] : NULL);
-		/* generate_hsm expects to free this, so use strdup */
+		/* generate_hsm expects to free these, so use strdup */
+		word_list = (argc > 4 ? strdup(argv[4]) : NULL);
 		passphrase = (argc > 5 ? strdup(argv[5]) : NULL);
 
 		return generate_hsm(hsm_secret_path, lang_id, word_list, passphrase);